| 1 | <?xml version='1.0' encoding='UTF-8'?>
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| 2 | <!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
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| 3 | <topic xml:lang="en-us" id="KnownProblems">
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| 4 | <title>Known Issues</title>
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| 5 |
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| 6 | <body>
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| 7 | <p>The following section describes known problems with this release of <ph
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| 8 | conkeyref="vbox-conkeyref-phrases/product-name"/>. Unless marked otherwise, these issues are planned to be fixed
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| 9 | in later releases. </p>
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| 10 | <ul>
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| 11 | <li>
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| 12 | <p>The macOS installer packages for <ph conkeyref="vbox-conkeyref-phrases/product-name"/> 7 currently do not
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| 13 | include the Internal Networking feature, which is available on all other platforms. This will be addressed
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| 14 | with an update of <ph conkeyref="vbox-conkeyref-phrases/product-name"/> 7. For setups which depend on this
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| 15 | functionality it is best to keep using <ph conkeyref="vbox-conkeyref-phrases/product-name"/> 6.1. </p>
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| 16 | </li>
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| 17 | <li>
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| 18 | <p>Poor performance when using <ph conkeyref="vbox-conkeyref-phrases/product-name"/> and <b outputclass="bold"
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| 19 | >Hyper-V</b> on the same host. To fix this, certain Windows features like "Hyper-V Platform", "Virtual
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| 20 | Machine Platform" and "Windows Hypervisor Platform" must be turned off, followed by a host reboot. </p>
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| 21 | <p>On newer Windows versions, enabling the device security features Core Isolation or Memory Integrity will use Hyper-V, even if you had previously turned it off.</p>
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| 22 | <p>Additionally, the Microsoft Device Guard and Credential Guard hardware readiness tool might have to be used
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| 23 | in order to turn off more features. For example, by running the following command: </p>
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| 24 | <pre xml:space="preserve">.\DG_Readiness_Tool_vX.X.ps1 -Disable -AutoReboot</pre>
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| 25 | <note>
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| 26 | <p>Disabling Device Guard and Credential Guard features will have an impact on the overall security of the
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| 27 | host. Please contact your Administrator beforehand regarding this. </p>
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| 28 | </note>
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| 29 | </li>
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| 30 | <li>
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| 31 | <p>
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| 32 | The following <b outputclass="bold">Guest SMP (multiprocessor)
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| 33 | limitations</b> exist:
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| 34 | </p>
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| 35 | <ul>
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| 36 | <li>
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| 37 | <p><b outputclass="bold">Poor performance</b> with
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| 38 | 32-bit guests on AMD CPUs. This affects mainly Windows and
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| 39 | Oracle Solaris guests, but possibly also some Linux kernel
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| 40 | revisions. Partially solved for 32-bit Windows NT, 2000,
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| 41 | XP, and 2003 guests. Requires the Guest Additions to be
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| 42 | installed.
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| 43 | </p>
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| 44 | </li>
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| 45 | <li>
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| 46 | <p><b outputclass="bold">Poor performance</b> with
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| 47 | 32-bit guests on certain Intel CPU models that do not
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| 48 | include virtual APIC hardware optimization support. This
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| 49 | affects mainly Windows and Oracle Solaris guests, but
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| 50 | possibly also some Linux kernel revisions. Partially
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| 51 | solved for 32-bit Windows NT, 2000, XP, and 2003 guests.
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| 52 | Requires the Guest Additions to be installed.
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| 53 | </p>
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| 54 | </li>
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| 55 | </ul>
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| 56 | </li>
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| 57 | <li>
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| 58 | <p><b outputclass="bold">NX (no execute, data execution
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| 59 | prevention)</b> only works for guests running on 64-bit
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| 60 | hosts and requires that hardware virtualization be enabled.
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| 61 | </p>
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| 62 | </li>
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| 63 | <li>
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| 64 | <p><b outputclass="bold">Guest control.</b> On Windows
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| 65 | guests, a process started using the guest control execute
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| 66 | support will not be able to display a graphical user interface
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| 67 | <i>unless</i> the user account under which it is
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| 68 | running is currently logged in and has a desktop session.
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| 69 | </p>
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| 70 | <p>Also, to use accounts without or with an empty password, the guest's group policy must be changed. To do so,
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| 71 | open the group policy editor on the command line by typing <userinput>gpedit.msc</userinput>, open the key
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| 72 | <codeph>Computer Configuration\Windows Settings\Security Settings\Local Policies\Security Options</codeph>
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| 73 | and change the value of <codeph>Accounts: Limit local account use of blank passwords to console logon
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| 74 | only</codeph> to Disabled. </p>
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| 75 | </li>
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| 76 | <li>
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| 77 | <p><b outputclass="bold">Compacting virtual disk images is
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| 78 | limited to VDI files.</b> The <userinput>VBoxManage
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| 79 | modifymedium --compact</userinput> command is currently only
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| 80 | implemented for VDI files. At the moment the only way to
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| 81 | optimize the size of a virtual disk images in other formats,
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| 82 | such as VMDK or VHD, is to clone the image and then use the
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| 83 | cloned image in the VM configuration.
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| 84 | </p>
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| 85 | </li>
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| 86 | <li>
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| 87 | <p><b outputclass="bold">OVF import/export:</b>
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| 88 | </p>
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| 89 | <ul>
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| 90 | <li>
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| 91 | <p>OVF localization, with multiple languages in a single OVF file, is not yet supported. </p>
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| 92 | </li>
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| 93 | <li>
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| 94 | <p>Some OVF sections like StartupSection, DeploymentOptionSection, and InstallSection are ignored. </p>
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| 95 | </li>
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| 96 | <li>
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| 97 | <p>OVF environment documents, including their property sections and appliance configuration with ISO images,
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| 98 | are not yet supported. </p>
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| 99 | </li>
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| 100 | <li>
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| 101 | <p>Remote files using HTTP or other mechanisms are not yet supported. </p>
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| 102 | </li>
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| 103 | </ul>
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| 104 | </li>
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| 105 | <li>
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| 106 | <p>Neither <b outputclass="bold">scale mode</b> nor <b outputclass="bold">seamless mode</b> work correctly with
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| 107 | guests using OpenGL 3D features, such as with Compiz-enabled window managers. </p>
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| 108 | </li>
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| 109 | <li>
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| 110 | <p>The RDP server in the <ph conkeyref="vbox-conkeyref-phrases/product-name"/> extension pack supports only
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| 111 | audio streams in format 22.05kHz stereo 16-bit. If the RDP client requests any other audio format there will
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| 112 | be no audio. </p>
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| 113 | </li>
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| 114 | <li>
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| 115 | <p>Preserving the aspect ratio in scale mode works only on Windows hosts and on macOS hosts. </p>
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| 116 | </li>
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| 117 | <li>
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| 118 | <p>On <b outputclass="bold">macOS hosts</b>, the following features are not yet implemented: </p>
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| 119 | <ul>
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| 120 | <li>
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| 121 | <p>
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| 122 | Numlock emulation
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| 123 | </p>
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| 124 | </li>
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| 125 | <li>
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| 126 | <p>
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| 127 | CPU frequency metric
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| 128 | </p>
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| 129 | </li>
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| 130 | <li>
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| 131 | <p>
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| 132 | Memory ballooning
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| 133 | </p>
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| 134 | </li>
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| 135 | </ul>
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| 136 | </li>
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| 137 | <li>
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| 138 | <p><b outputclass="bold">macOS/Arm 64 (Apple silicon) host package</b>
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| 139 | <ul id="ul_ddr_kzn_hcc">
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| 140 | <li>
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| 141 | <p>x86-based guest operating systems will not run.</p>
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| 142 | </li>
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| 143 | <li>
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| 144 | <p>Arm(AArch64) guests only. Arm 32 is not supported at present.</p>
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| 145 | </li>
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| 146 | <li>
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| 147 | <p>Arm hosts have limitations with sound, storage, graphics, guest additions and unattended
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| 148 | installation.</p>
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| 149 | </li>
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| 150 | </ul></p>
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| 151 | </li>
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| 152 | <li>
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| 153 | <p><b outputclass="bold">Mac OS X guests:</b>
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| 154 | </p>
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| 155 | <ul>
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| 156 | <li>
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| 157 | <p>Mac OS X guests can only run on a certain host hardware. For details about license and host hardware
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| 158 | limitations. See <xref href="intro-macosxguests.dita">Mac OS X Guests</xref> and check the Apple software
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| 159 | license conditions. </p>
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| 160 | </li>
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| 161 | <li>
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| 162 | <p><ph conkeyref="vbox-conkeyref-phrases/product-name"/> does not provide Guest Additions for Mac OS X at
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| 163 | this time. </p>
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| 164 | </li>
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| 165 | <li>
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| 166 | <p>The graphics resolution currently defaults to 1024x768 as Mac OS X falls back to the built-in EFI display
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| 167 | support. See <xref href="efividmode.dita">Video Modes in EFI</xref> for more information on how to change
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| 168 | EFI video modes. </p>
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| 169 | </li>
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| 170 | <li>
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| 171 | <p>Mac OS X guests only work with one CPU assigned to the VM. Support for SMP will be provided in a future
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| 172 | release. </p>
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| 173 | </li>
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| 174 | <li>
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| 175 | <p>Depending on your system and version of Mac OS X, you might experience guest hangs after some time. This
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| 176 | can be fixed by turning off energy saving. Set the timeout to "Never" in the system preferences. </p>
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| 177 | </li>
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| 178 | <li>
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| 179 | <p>By default, the <ph conkeyref="vbox-conkeyref-phrases/product-name"/> EFI enables debug output of the Mac
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| 180 | OS X kernel to help you diagnose boot problems. Note that there is a lot of output and not all errors are
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| 181 | fatal. They would also show when using a physical Apple Macintosh computer. You can turn off these
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| 182 | messages by using the following command: </p>
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| 183 | <pre xml:space="preserve">$ VBoxManage setextradata <varname>VM-name</varname> "VBoxInternal2/EfiBootArgs" " "</pre>
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| 184 | <p>
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| 185 | To revert to the previous behavior, use the following
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| 186 | command:
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| 187 | </p>
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| 188 | <pre xml:space="preserve">$ VBoxManage setextradata <varname>VM-name</varname> "VBoxInternal2/EfiBootArgs" ""</pre>
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| 189 | </li>
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| 190 | <li>
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| 191 | <p>It is currently not possible to start a Mac OS X guest in safe mode by specifying the <codeph>-x</codeph>
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| 192 | option in <codeph>VBoxInternal2/EfiBootArgs</codeph> extradata. </p>
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| 193 | </li>
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| 194 | </ul>
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| 195 | </li>
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| 196 | <li>
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| 197 | <p>
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| 198 | <b outputclass="bold">Oracle Solaris hosts:</b>
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| 199 | </p>
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| 200 | <ul>
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| 201 | <li>
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| 202 | <p>USB support on Oracle Solaris hosts requires Oracle Solaris 11 FCS or later. Webcams and other isochronous devices are known to have poor performance. </p>
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| 203 | </li>
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| 204 | <li>
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| 205 | <p>Host Webcam passthrough is restricted to 640x480 frames at 20 frames per second due to limitations in the
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| 206 | Oracle Solaris V4L2 API. This may be addressed in a future Oracle Solaris release. </p>
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| 207 | </li>
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| 208 | <li>
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| 209 | <p>No ACPI information, such as battery status or power source, is reported to the guest. </p>
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| 210 | </li>
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| 211 | <li>
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| 212 | <p>No support for using wireless adapters with bridged networking. </p>
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| 213 | </li>
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| 214 | <li>
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| 215 | <p>Crossbow-based bridged networking on Oracle Solaris 11 hosts does not work directly with aggregate links. However, you can use <userinput>dladm</userinput> to manually create a VNIC over the aggregate link and use that with a VM. This limitation does not exist in Oracle Solaris 11 update 1 (11.1) and later. </p>
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| 216 | </li>
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| 217 | </ul>
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| 218 | </li>
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| 219 | <li>
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| 220 | <p>Neither virtio nor Intel PRO/1000 drivers for <b outputclass="bold">Windows XP guests</b> support
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| 221 | segmentation offloading. Therefore Windows XP guests have slower transmission rates comparing to other guest
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| 222 | types. Refer to MS Knowledge base article 842264 for additional information. </p>
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| 223 | </li>
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| 224 | <li>
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| 225 | <p><b outputclass="bold">Guest Additions for OS/2.</b>
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| 226 | Seamless windows and automatic guest resizing will probably
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| 227 | never be implemented due to inherent limitations of the OS/2
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| 228 | graphics system.
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| 229 | </p>
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| 230 | </li>
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| 231 | <li>
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| 232 | <p>Some guest operating systems predating ATAPI CD-ROMs may exhibit long delays or entirely fail to boot in
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| 233 | certain configurations. This is most likely to happen when an IDE/ATAPI CD-ROM exists alone on a primary or
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| 234 | secondary IDE channel. </p>
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| 235 | <p>Affected operating systems are MS OS/2 1.21: fails to boot with an error message referencing COUNTRY.SYS and
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| 236 | MS OS/2 1.3: long boot delays. To avoid such problems, disable the emulated IDE/ATAPI CD-ROM. The guest OS
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| 237 | cannot use this device, anyway. </p>
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| 238 | </li>
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| 239 | </ul>
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| 240 | </body>
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| 241 |
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| 242 | </topic>
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