| 1 | <?xml version="1.0" encoding="UTF-8"?>
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| 2 | <!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd"[
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| 4 | <!ENTITY % all.entities SYSTEM "all-entities.ent">
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| 5 | %all.entities;
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| 6 | ]>
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| 7 | <chapter id="KnownIssues">
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| 8 |
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| 9 | <title>Known Limitations</title>
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| 10 |
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| 11 | <sect1 id="ExperimentalFeatures">
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| 12 |
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| 13 | <title>Experimental Features</title>
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| 14 |
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| 15 | <para>
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| 16 | Some VirtualBox features are labeled as experimental. Such
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| 17 | features are provided on an "as-is" basis and are not formally
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| 18 | supported. However, feedback and suggestions about such features
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| 19 | are welcome. A comprehensive list of experimental features is as
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| 20 | follows:
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| 21 | </para>
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| 22 |
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| 23 | <itemizedlist>
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| 24 |
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| 25 | <listitem>
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| 26 | <para>
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| 27 | Hardware 3D acceleration support for Windows, Linux, and
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| 28 | Solaris guests
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| 29 | </para>
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| 30 | </listitem>
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| 31 |
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| 32 | <listitem>
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| 33 | <para>
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| 34 | Hardware 2D video playback acceleration support for Windows
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| 35 | guests
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| 36 | </para>
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| 37 | </listitem>
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| 38 |
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| 39 | <listitem>
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| 40 | <para>
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| 41 | PCI pass-through (Linux hosts only)
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| 42 | </para>
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| 43 | </listitem>
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| 44 |
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| 45 | <listitem>
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| 46 | <para>
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| 47 | Mac OS X guests (Mac OS X hosts only)
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| 48 | </para>
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| 49 | </listitem>
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| 50 |
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| 51 | <listitem>
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| 52 | <para>
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| 53 | ICH9 chipset emulation
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| 54 | </para>
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| 55 | </listitem>
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| 56 |
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| 57 | <listitem>
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| 58 | <para>
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| 59 | EFI firmware
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| 60 | </para>
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| 61 | </listitem>
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| 62 |
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| 63 | <listitem>
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| 64 | <para>
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| 65 | Host CD/DVD drive pass-through
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| 66 | </para>
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| 67 | </listitem>
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| 68 |
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| 69 | <listitem>
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| 70 | <para>
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| 71 | Support of iSCSI via internal networking
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| 72 | </para>
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| 73 | </listitem>
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| 74 |
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| 75 | </itemizedlist>
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| 76 |
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| 77 | </sect1>
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| 78 |
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| 79 | <sect1 id="KnownProblems">
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| 80 |
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| 81 | <title>Known Issues</title>
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| 82 |
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| 83 | <para>
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| 84 | The following section describes known problems with this release
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| 85 | of VirtualBox. Unless marked otherwise, these issues are planned
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| 86 | to be fixed in later releases.
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| 87 | </para>
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| 88 |
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| 89 | <itemizedlist>
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| 90 |
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| 91 | <listitem>
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| 92 | <para>
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| 93 | The following <emphasis role="bold">Guest SMP (multiprocessor)
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| 94 | limitations</emphasis> exist:
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| 95 | </para>
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| 96 |
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| 97 | <itemizedlist>
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| 98 |
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| 99 | <listitem>
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| 100 | <para>
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| 101 | <emphasis role="bold">Poor performance</emphasis> with
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| 102 | 32-bit guests on AMD CPUs. This affects mainly Windows and
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| 103 | Solaris guests, but possibly also some Linux kernel
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| 104 | revisions. Partially solved in 3.0.6 for 32 bits Windows
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| 105 | NT, 2000, XP and 2003 guests. Requires 3.0.6 or higher
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| 106 | Guest Additions to be installed.
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| 107 | </para>
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| 108 | </listitem>
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| 109 |
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| 110 | <listitem>
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| 111 | <para>
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| 112 | <emphasis role="bold">Poor performance</emphasis> with
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| 113 | 32-bit guests on certain Intel CPU models that do not
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| 114 | include virtual APIC hardware optimization support. This
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| 115 | affects mainly Windows and Solaris guests, but possibly
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| 116 | also some Linux kernel revisions. Partially solved in
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| 117 | 3.0.12 for 32 bits Windows NT, 2000, XP, and 2003 guests.
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| 118 | Requires 3.0.12 or higher Guest Additions to be installed.
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| 119 | </para>
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| 120 | </listitem>
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| 121 |
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| 122 | </itemizedlist>
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| 123 | </listitem>
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| 124 |
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| 125 | <listitem>
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| 126 | <para>
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| 127 | <emphasis role="bold">NX (no execute, data execution
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| 128 | prevention)</emphasis> only works for guests running on 64-bit
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| 129 | hosts or guests running on 32-bit hosts with PAE enabled and
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| 130 | requires that hardware virtualization be enabled.
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| 131 | </para>
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| 132 | </listitem>
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| 133 |
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| 134 | <listitem>
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| 135 | <para>
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| 136 | For <emphasis role="bold">basic Direct3D support in Windows
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| 137 | guests</emphasis> to work, the Guest Additions must be
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| 138 | installed in Windows "safe mode". Press F8 when the Windows
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| 139 | guest is booting and select "Safe mode", then install the
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| 140 | Guest Additions. Otherwise the Windows file protection
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| 141 | mechanism will interfere with the replacement DLLs installed
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| 142 | by VirtualBox and keep restoring the original Windows system
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| 143 | DLLs.
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| 144 |
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| 145 | <note>
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| 146 | <para>
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| 147 | This does <emphasis>not</emphasis> apply to the WDDM
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| 148 | Direct3D video driver available for Vista and Windows 7
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| 149 | guests shipped with VirtualBox 4.1.
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| 150 | </para>
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| 151 | </note>
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| 152 | </para>
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| 153 | </listitem>
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| 154 |
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| 155 | <listitem>
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| 156 | <para>
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| 157 | <emphasis role="bold">Guest control.</emphasis> On Windows
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| 158 | guests, a process lauched via the guest control execute
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| 159 | support will not be able to display a graphical user interface
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| 160 | <emphasis>unless</emphasis> the user account under which it is
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| 161 | running is currently logged in and has a desktop session.
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| 162 | </para>
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| 163 |
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| 164 | <para>
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| 165 | Also, to use accounts without or with an empty password, the
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| 166 | guest's group policy must be changed. To do so, open the group
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| 167 | policy editor on the command line by typing
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| 168 | <computeroutput>gpedit.msc</computeroutput>, open the key
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| 169 | <emphasis>Computer Configuration\Windows Settings\Security
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| 170 | Settings\Local Policies\Security Options</emphasis> and change
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| 171 | the value of <emphasis>Accounts: Limit local account use of
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| 172 | blank passwords to console logon only</emphasis> to
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| 173 | <emphasis>Disabled</emphasis>.
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| 174 | </para>
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| 175 | </listitem>
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| 176 |
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| 177 | <listitem>
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| 178 | <para>
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| 179 | <emphasis role="bold">Compacting virtual disk images is
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| 180 | limited to VDI files.</emphasis> The <code>VBoxManage modifyhd
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| 181 | --compact</code> command is currently only implemented for VDI
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| 182 | files. At the moment the only way to optimize the size of a
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| 183 | virtual disk images in other formats (VMDK, VHD) is to clone
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| 184 | the image and then use the cloned image in the VM
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| 185 | configuration.
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| 186 | </para>
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| 187 | </listitem>
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| 188 |
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| 189 | <listitem>
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| 190 | <para>
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| 191 | <emphasis role="bold">OVF import/export:</emphasis>
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| 192 | </para>
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| 193 |
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| 194 | <itemizedlist>
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| 195 |
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| 196 | <listitem>
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| 197 | <para>
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| 198 | OVF localization, with multiple languages in a single OVF
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| 199 | file, is not yet supported.
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| 200 | </para>
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| 201 | </listitem>
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| 202 |
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| 203 | <listitem>
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| 204 | <para>
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| 205 | Some OVF sections like StartupSection,
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| 206 | DeploymentOptionSection, and InstallSection are ignored.
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| 207 | </para>
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| 208 | </listitem>
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| 209 |
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| 210 | <listitem>
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| 211 | <para>
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| 212 | OVF environment documents, including their property
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| 213 | sections and appliance configuration with ISO images, are
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| 214 | not yet supported.
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| 215 | </para>
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| 216 | </listitem>
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| 217 |
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| 218 | <listitem>
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| 219 | <para>
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| 220 | Remote files via HTTP or other mechanisms are not yet
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| 221 | supported.
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| 222 | </para>
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| 223 | </listitem>
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| 224 |
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| 225 | </itemizedlist>
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| 226 | </listitem>
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| 227 |
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| 228 | <listitem>
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| 229 | <para>
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| 230 | Neither <emphasis role="bold">scale mode</emphasis> nor
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| 231 | <emphasis
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| 232 | role="bold">seamless mode</emphasis> work
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| 233 | correctly with guests using OpenGL 3D features, such as with
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| 234 | compiz-enabled window managers.
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| 235 | </para>
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| 236 | </listitem>
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| 237 |
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| 238 | <listitem>
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| 239 | <para>
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| 240 | The RDP server in the VirtualBox extension pack supports only
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| 241 | audio streams in format 22.05kHz stereo 16 bit. If the RDP
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| 242 | client requests any other audio format there will be no audio.
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| 243 | </para>
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| 244 | </listitem>
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| 245 |
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| 246 | <listitem>
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| 247 | <para>
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| 248 | Preserving the aspect ratio in scale mode works only on
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| 249 | Windows hosts and on Mac OS X hosts.
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| 250 | </para>
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| 251 | </listitem>
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| 252 |
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| 253 | <listitem>
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| 254 | <para>
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| 255 | On <emphasis role="bold">Mac OS X hosts,</emphasis> the
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| 256 | following features are not yet implemented:
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| 257 | </para>
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| 258 |
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| 259 | <itemizedlist>
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| 260 |
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| 261 | <listitem>
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| 262 | <para>
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| 263 | Numlock emulation
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| 264 | </para>
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| 265 | </listitem>
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| 266 |
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| 267 | <listitem>
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| 268 | <para>
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| 269 | CPU frequency metric
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| 270 | </para>
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| 271 | </listitem>
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| 272 |
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| 273 | <listitem>
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| 274 | <para>
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| 275 | Memory ballooning
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| 276 | </para>
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| 277 | </listitem>
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| 278 |
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| 279 | </itemizedlist>
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| 280 | </listitem>
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| 281 |
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| 282 | <listitem>
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| 283 | <para>
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| 284 | <emphasis role="bold">Mac OS X guests:</emphasis>
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| 285 | </para>
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| 286 |
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| 287 | <itemizedlist>
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| 288 |
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| 289 | <listitem>
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| 290 | <para>
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| 291 | Mac OS X guests can only run on a certain host hardware.
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| 292 | For details about license and host hardware limitations.
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| 293 | See <xref linkend="intro-macosxguests" /> and check the
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| 294 | Apple software license conditions.
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| 295 | </para>
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| 296 | </listitem>
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| 297 |
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| 298 | <listitem>
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| 299 | <para>
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| 300 | VirtualBox does not provide Guest Additions for Mac OS X
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| 301 | at this time.
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| 302 | </para>
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| 303 | </listitem>
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| 304 |
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| 305 | <listitem>
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| 306 | <para>
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| 307 | The graphics resolution currently defaults to 1024x768 as
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| 308 | Mac OS X falls back to the built-in EFI display support.
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| 309 | See <xref linkend="efividmode" /> for more information on
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| 310 | how to change EFI video modes.
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| 311 | </para>
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| 312 | </listitem>
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| 313 |
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| 314 | <listitem>
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| 315 | <para>
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| 316 | Mac OS X guests only work with one CPU assigned to the VM.
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| 317 | Support for SMP will be provided in a future release.
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| 318 | </para>
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| 319 | </listitem>
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| 320 |
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| 321 | <listitem>
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| 322 | <para>
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| 323 | Depending on your system and version of Mac OS X, you
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| 324 | might experience guest hangs after some time. This can be
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| 325 | fixed by turning off energy saving. Set timeout to "Never"
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| 326 | in the system preferences.
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| 327 | </para>
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| 328 | </listitem>
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| 329 |
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| 330 | <listitem>
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| 331 | <para>
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| 332 | By default, the VirtualBox EFI enables debug output of the
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| 333 | Mac OS X kernel to help you diagnose boot problems. Note
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| 334 | that there is a lot of output and not all errors are
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| 335 | fatal. They would also show when using a physical Apple
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| 336 | Macintosh computer. You can turn off these messages by
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| 337 | issuing this command:
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| 338 |
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| 339 | <screen>VBoxManage setextradata "VM name" "VBoxInternal2/EfiBootArgs" " "</screen>
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| 340 |
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| 341 | To revert to the previous behavior, use:
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| 342 |
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| 343 | <screen>VBoxManage setextradata "VM name" "VBoxInternal2/EfiBootArgs" ""</screen>
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| 344 | </para>
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| 345 | </listitem>
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| 346 |
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| 347 | <listitem>
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| 348 | <para>
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| 349 | It is currently not possible to start a Mac OS X guest in
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| 350 | safe mode by specifying "-x" option in
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| 351 | "VBoxInternal2/EfiBootArgs" extradata.
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| 352 | </para>
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| 353 | </listitem>
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| 354 |
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| 355 | </itemizedlist>
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| 356 | </listitem>
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| 357 |
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| 358 | <listitem>
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| 359 | <para>
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| 360 | <emphasis role="bold">Solaris hosts:</emphasis>
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| 361 | </para>
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| 362 |
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| 363 | <itemizedlist>
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| 364 |
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| 365 | <listitem>
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| 366 | <para>
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| 367 | There is no support for USB devices connected to Solaris
|
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| 368 | 10 hosts.
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| 369 | </para>
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| 370 | </listitem>
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| 371 |
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| 372 | <listitem>
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| 373 | <para>
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| 374 | USB support on Solaris hosts requires Solaris 11 version
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| 375 | snv_124 or higher. Webcams and other isochronous devices
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| 376 | are known to have poor performance.
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| 377 | </para>
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| 378 | </listitem>
|
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| 379 |
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| 380 | <listitem>
|
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| 381 | <para>
|
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| 382 | Host Webcam passthrough is restricted to 640x480 frames at
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| 383 | 20 frames per second due to limitations in the Solaris
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| 384 | V4L2 API. This may be addressed in a future Solaris
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| 385 | release.
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| 386 | </para>
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| 387 | </listitem>
|
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| 388 |
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| 389 | <listitem>
|
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| 390 | <para>
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| 391 | No ACPI information, such as battery status or power
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| 392 | source, is reported to the guest.
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| 393 | </para>
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| 394 | </listitem>
|
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| 395 |
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| 396 | <listitem>
|
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| 397 | <para>
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| 398 | No support for using wireless adapters with bridged
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| 399 | networking.
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| 400 | </para>
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| 401 | </listitem>
|
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| 402 |
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| 403 | <listitem>
|
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| 404 | <para>
|
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| 405 | Crossbow-based bridged networking on Solaris 11 hosts does
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| 406 | not work directly with aggregate links. However, you can
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| 407 | use <computeroutput>dladm</computeroutput> to manually
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| 408 | create a VNIC over the aggregate link and use that with a
|
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| 409 | VM. This limitation does not exist in Solaris 11u1 build
|
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| 410 | 17 and newer.
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|---|
| 411 | </para>
|
|---|
| 412 | </listitem>
|
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| 413 |
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| 414 | </itemizedlist>
|
|---|
| 415 | </listitem>
|
|---|
| 416 |
|
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| 417 | <listitem>
|
|---|
| 418 | <para>
|
|---|
| 419 | <emphasis role="bold">Guest Additions of version 4.1, 4.1.2
|
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| 420 | and 4.1.4 for Windows.</emphasis> The VirtualBox WDDM Video
|
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| 421 | driver may be installed and remain in the guest system when
|
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| 422 | Guest additions uninstallation is performed. This is caused by
|
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| 423 | a bug in Guest Additions uninstaller.
|
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| 424 | </para>
|
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| 425 |
|
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| 426 | <note>
|
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| 427 | <para>
|
|---|
| 428 | This does <emphasis>not</emphasis> apply to a Guest
|
|---|
| 429 | Additions update. Installing one version of Guest Additions
|
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| 430 | on top of another works correctly.
|
|---|
| 431 | </para>
|
|---|
| 432 | </note>
|
|---|
| 433 |
|
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| 434 | <para>
|
|---|
| 435 | To solve this problem, uninstall the VirtualBox WDDM Video
|
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| 436 | driver manually. Open Device Manager, and check whether the
|
|---|
| 437 | Display Adapter is named "VirtualBox Graphics Adapter ..". If
|
|---|
| 438 | not, there is nothing to be done. If it is, right-click the
|
|---|
| 439 | VirtualBox Graphics Adapter in Device Manager, select
|
|---|
| 440 | <emphasis role="bold">Uninstall</emphasis>, check
|
|---|
| 441 | <emphasis role="bold">Delete the Driver Software for this
|
|---|
| 442 | Device</emphasis> and click
|
|---|
| 443 | <emphasis role="bold">OK</emphasis>. Once uninstallation is
|
|---|
| 444 | done, start Device Manager, go to the Action menu and select
|
|---|
| 445 | <emphasis role="bold">Scan for Hardware Change</emphasis>s to
|
|---|
| 446 | ensure that the correct Windows default driver be picked up
|
|---|
| 447 | for the Graphics adapter.
|
|---|
| 448 | </para>
|
|---|
| 449 | </listitem>
|
|---|
| 450 |
|
|---|
| 451 | <listitem>
|
|---|
| 452 | <para>
|
|---|
| 453 | Neither <emphasis>virtio</emphasis> nor <emphasis>Intel
|
|---|
| 454 | PRO/1000 </emphasis> drivers for <emphasis role="bold">Windows
|
|---|
| 455 | XP guests</emphasis> support segmentation offloading.
|
|---|
| 456 | Therefore Windows XP guests have slower transmission rates
|
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| 457 | comparing to other guest types. Refer to MS Knowledge base
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| 458 | article 842264 for additional information.
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| 459 | </para>
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| 460 | </listitem>
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| 461 |
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| 462 | <listitem>
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| 463 | <para>
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| 464 | <emphasis role="bold">Guest Additions for OS/2.</emphasis>
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| 465 | Shared folders are not yet supported with OS/2 guests. In
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| 466 | addition, seamless windows and automatic guest resizing will
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| 467 | probably never be implemented due to inherent limitations of
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| 468 | the OS/2 graphics system.
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| 469 | </para>
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| 470 | </listitem>
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| 471 |
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| 472 | <listitem>
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| 473 | <para>
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| 474 | Some guest operating systems predating ATAPI CD-ROMs may
|
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| 475 | exhibit long delays or entirely fail to boot in certain
|
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| 476 | configurations. This is most likely to happen when an
|
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| 477 | IDE/ATAPI CD-ROM exists alone on a primary or secondary IDE
|
|---|
| 478 | channel.
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| 479 | </para>
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| 480 |
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| 481 | <para>
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| 482 | Affected operating systems are MS OS/2 1.21: fails to boot
|
|---|
| 483 | with an error message referencing COUNTRY.SYS and MS OS/2 1.3:
|
|---|
| 484 | long boot delays. To avoid such problems, disable the emulated
|
|---|
| 485 | IDE/ATAPI CD-ROM. The guest OS cannot use this device, anyway.
|
|---|
| 486 | </para>
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|---|
| 487 | </listitem>
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| 488 |
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| 489 | </itemizedlist>
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| 490 |
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| 491 | </sect1>
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| 492 |
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| 493 | </chapter>
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