VirtualBox

source: vbox/trunk/doc/manual/en_US/user_KnownIssues.xml@ 81235

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manual: integrate drop #30 with minimal manual adjustments (but everything into one book, with manually applied tweaks to turn the release notes into a pure changelog again and manually re-applied the last changelog change since it wasn't included yet)

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1<?xml version="1.0" encoding="UTF-8"?>
2<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd"[
4<!ENTITY % all.entities SYSTEM "all-entities.ent">
5%all.entities;
6]>
7<chapter id="KnownIssues">
8
9 <title>Known Limitations</title>
10
11 <sect1 id="ExperimentalFeatures">
12
13 <title>Experimental Features</title>
14
15 <para>
16 Some &product-name; features are labeled as experimental. Such
17 features are provided on an "as-is" basis and are not formally
18 supported. However, feedback and suggestions about such features
19 are welcome. A comprehensive list of experimental features is as
20 follows:
21 </para>
22
23 <itemizedlist>
24
25 <listitem>
26 <para>
27 Hardware 3D acceleration support for Windows, Linux, and
28 Oracle Solaris guests
29 </para>
30 </listitem>
31
32 <listitem>
33 <para>
34 Hardware 2D video playback acceleration support for Windows
35 guests
36 </para>
37 </listitem>
38
39 <listitem>
40 <para>
41 PCI pass-through (Linux hosts only)
42 </para>
43 </listitem>
44
45 <listitem>
46 <para>
47 Mac OS X guests (Mac OS X hosts only)
48 </para>
49 </listitem>
50
51 <listitem>
52 <para>
53 ICH9 chipset emulation
54 </para>
55 </listitem>
56
57 <listitem>
58 <para>
59 EFI firmware
60 </para>
61 </listitem>
62
63 <listitem>
64 <para>
65 Host CD/DVD drive pass-through
66 </para>
67 </listitem>
68
69 <listitem>
70 <para>
71 Support of iSCSI using internal networking
72 </para>
73 </listitem>
74
75 <listitem>
76 <para>
77 Using &product-name; and Hyper-V on the same host
78 </para>
79 </listitem>
80
81 </itemizedlist>
82
83 </sect1>
84
85 <sect1 id="KnownProblems">
86
87 <title>Known Issues</title>
88
89 <para>
90 The following section describes known problems with this release
91 of &product-name;. Unless marked otherwise, these issues are
92 planned to be fixed in later releases.
93 </para>
94
95 <itemizedlist>
96
97 <listitem>
98 <para>
99 The following <emphasis role="bold">Guest SMP (multiprocessor)
100 limitations</emphasis> exist:
101 </para>
102
103 <itemizedlist>
104
105 <listitem>
106 <para>
107 <emphasis role="bold">Poor performance</emphasis> with
108 32-bit guests on AMD CPUs. This affects mainly Windows and
109 Oracle Solaris guests, but possibly also some Linux kernel
110 revisions. Partially solved in 3.0.6 for 32-bit Windows
111 NT, 2000, XP, and 2003 guests. Requires Guest Additions
112 3.0.6 or later to be installed.
113 </para>
114 </listitem>
115
116 <listitem>
117 <para>
118 <emphasis role="bold">Poor performance</emphasis> with
119 32-bit guests on certain Intel CPU models that do not
120 include virtual APIC hardware optimization support. This
121 affects mainly Windows and Oracle Solaris guests, but
122 possibly also some Linux kernel revisions. Partially
123 solved in 3.0.12 for 32-bit Windows NT, 2000, XP, and 2003
124 guests. Requires Guest Additions 3.0.12 or later to be
125 installed.
126 </para>
127 </listitem>
128
129 </itemizedlist>
130 </listitem>
131
132 <listitem>
133 <para>
134 <emphasis role="bold">NX (no execute, data execution
135 prevention)</emphasis> only works for guests running on 64-bit
136 hosts or guests running on 32-bit hosts with PAE enabled and
137 requires that hardware virtualization be enabled.
138 </para>
139 </listitem>
140
141 <listitem>
142 <para>
143 For <emphasis role="bold">basic Direct3D support in Windows
144 guests</emphasis> to work, the Guest Additions must be
145 installed in Windows safe mode. Press F8 when the Windows
146 guest is booting and select <emphasis role="bold">Safe
147 Mode</emphasis>, then install the Guest Additions. Otherwise
148 the Windows file protection mechanism will interfere with the
149 replacement DLLs installed by &product-name; and keep
150 restoring the original Windows system DLLs.
151 </para>
152
153 <note>
154 <para>
155 This does <emphasis>not</emphasis> apply to the WDDM
156 Direct3D video driver available for Vista and Windows 7
157 guests shipped with &product-name; 4.1.
158 </para>
159 </note>
160 </listitem>
161
162 <listitem>
163 <para>
164 <emphasis role="bold">Guest control.</emphasis> On Windows
165 guests, a process started using the guest control execute
166 support will not be able to display a graphical user interface
167 <emphasis>unless</emphasis> the user account under which it is
168 running is currently logged in and has a desktop session.
169 </para>
170
171 <para>
172 Also, to use accounts without or with an empty password, the
173 guest's group policy must be changed. To do so, open the group
174 policy editor on the command line by typing
175 <command>gpedit.msc</command>, open the key
176 <computeroutput>Computer Configuration\Windows
177 Settings\Security Settings\Local Policies\Security
178 Options</computeroutput> and change the value of
179 <computeroutput>Accounts: Limit local account use of blank
180 passwords to console logon only</computeroutput> to Disabled.
181 </para>
182 </listitem>
183
184 <listitem>
185 <para>
186 <emphasis role="bold">Compacting virtual disk images is
187 limited to VDI files.</emphasis> The <command>VBoxManage
188 modifyhd --compact</command> command is currently only
189 implemented for VDI files. At the moment the only way to
190 optimize the size of a virtual disk images in other formats,
191 such as VMDK or VHD, is to clone the image and then use the
192 cloned image in the VM configuration.
193 </para>
194 </listitem>
195
196 <listitem>
197 <para>
198 <emphasis role="bold">OVF import/export:</emphasis>
199 </para>
200
201 <itemizedlist>
202
203 <listitem>
204 <para>
205 OVF localization, with multiple languages in a single OVF
206 file, is not yet supported.
207 </para>
208 </listitem>
209
210 <listitem>
211 <para>
212 Some OVF sections like StartupSection,
213 DeploymentOptionSection, and InstallSection are ignored.
214 </para>
215 </listitem>
216
217 <listitem>
218 <para>
219 OVF environment documents, including their property
220 sections and appliance configuration with ISO images, are
221 not yet supported.
222 </para>
223 </listitem>
224
225 <listitem>
226 <para>
227 Remote files using HTTP or other mechanisms are not yet
228 supported.
229 </para>
230 </listitem>
231
232 </itemizedlist>
233 </listitem>
234
235 <listitem>
236 <para>
237 Neither <emphasis role="bold">scale mode</emphasis> nor
238 <emphasis
239 role="bold">seamless mode</emphasis> work
240 correctly with guests using OpenGL 3D features, such as with
241 compiz-enabled window managers.
242 </para>
243 </listitem>
244
245 <listitem>
246 <para>
247 The RDP server in the &product-name; extension pack supports
248 only audio streams in format 22.05kHz stereo 16 bit. If the
249 RDP client requests any other audio format there will be no
250 audio.
251 </para>
252 </listitem>
253
254 <listitem>
255 <para>
256 Preserving the aspect ratio in scale mode works only on
257 Windows hosts and on Mac OS X hosts.
258 </para>
259 </listitem>
260
261 <listitem>
262 <para>
263 On <emphasis role="bold">Mac OS X hosts,</emphasis> the
264 following features are not yet implemented:
265 </para>
266
267 <itemizedlist>
268
269 <listitem>
270 <para>
271 Numlock emulation
272 </para>
273 </listitem>
274
275 <listitem>
276 <para>
277 CPU frequency metric
278 </para>
279 </listitem>
280
281 <listitem>
282 <para>
283 Memory ballooning
284 </para>
285 </listitem>
286
287 </itemizedlist>
288 </listitem>
289
290 <listitem>
291 <para>
292 <emphasis role="bold">Mac OS X guests:</emphasis>
293 </para>
294
295 <itemizedlist>
296
297 <listitem>
298 <para>
299 Mac OS X guests can only run on a certain host hardware.
300 For details about license and host hardware limitations.
301 See <xref linkend="intro-macosxguests" /> and check the
302 Apple software license conditions.
303 </para>
304 </listitem>
305
306 <listitem>
307 <para>
308 &product-name; does not provide Guest Additions for Mac OS
309 X at this time.
310 </para>
311 </listitem>
312
313 <listitem>
314 <para>
315 The graphics resolution currently defaults to 1024x768 as
316 Mac OS X falls back to the built-in EFI display support.
317 See <xref linkend="efividmode" /> for more information on
318 how to change EFI video modes.
319 </para>
320 </listitem>
321
322 <listitem>
323 <para>
324 Mac OS X guests only work with one CPU assigned to the VM.
325 Support for SMP will be provided in a future release.
326 </para>
327 </listitem>
328
329 <listitem>
330 <para>
331 Depending on your system and version of Mac OS X, you
332 might experience guest hangs after some time. This can be
333 fixed by turning off energy saving. Set timeout to "Never"
334 in the system preferences.
335 </para>
336 </listitem>
337
338 <listitem>
339 <para>
340 By default, the &product-name; EFI enables debug output of
341 the Mac OS X kernel to help you diagnose boot problems.
342 Note that there is a lot of output and not all errors are
343 fatal. They would also show when using a physical Apple
344 Macintosh computer. You can turn off these messages by
345 using the following command:
346 </para>
347
348<screen>VBoxManage setextradata "VM name" "VBoxInternal2/EfiBootArgs" " "</screen>
349
350 <para>
351 To revert to the previous behavior, use the following
352 command:
353 </para>
354
355<screen>VBoxManage setextradata "VM name" "VBoxInternal2/EfiBootArgs" ""</screen>
356 </listitem>
357
358 <listitem>
359 <para>
360 It is currently not possible to start a Mac OS X guest in
361 safe mode by specifying "-x" option in
362 "VBoxInternal2/EfiBootArgs" extradata.
363 </para>
364 </listitem>
365
366 </itemizedlist>
367 </listitem>
368
369 <listitem>
370 <para>
371 <emphasis role="bold">Oracle Solaris hosts:</emphasis>
372 </para>
373
374 <itemizedlist>
375
376 <listitem>
377 <para>
378 There is no support for USB devices connected to Oracle
379 Solaris 10 hosts.
380 </para>
381 </listitem>
382
383 <listitem>
384 <para>
385 USB support on Oracle Solaris hosts requires Oracle
386 Solaris 11 version snv_124 or later. Webcams and other
387 isochronous devices are known to have poor performance.
388 </para>
389 </listitem>
390
391 <listitem>
392 <para>
393 Host Webcam passthrough is restricted to 640x480 frames at
394 20 frames per second due to limitations in the Oracle
395 Solaris V4L2 API. This may be addressed in a future Oracle
396 Solaris release.
397 </para>
398 </listitem>
399
400 <listitem>
401 <para>
402 No ACPI information, such as battery status or power
403 source, is reported to the guest.
404 </para>
405 </listitem>
406
407 <listitem>
408 <para>
409 No support for using wireless adapters with bridged
410 networking.
411 </para>
412 </listitem>
413
414 <listitem>
415 <para>
416 Crossbow-based bridged networking on Oracle Solaris 11
417 hosts does not work directly with aggregate links.
418 However, you can use
419 <computeroutput>dladm</computeroutput> to manually create
420 a VNIC over the aggregate link and use that with a VM.
421 This limitation does not exist in Oracle Solaris 11u1
422 build 17 and newer.
423 </para>
424 </listitem>
425
426 </itemizedlist>
427 </listitem>
428
429 <listitem>
430 <para>
431 <emphasis role="bold">Guest Additions of version 4.1, 4.1.2
432 and 4.1.4 for Windows.</emphasis> The &product-name; WDDM
433 Video driver may be installed and remain in the guest system
434 when Guest additions uninstallation is performed. This is
435 caused by a bug in Guest Additions uninstaller.
436 </para>
437
438 <note>
439 <para>
440 This does <emphasis>not</emphasis> apply to a Guest
441 Additions update. Installing one version of Guest Additions
442 on top of another works correctly.
443 </para>
444 </note>
445
446 <para>
447 To solve this problem, uninstall the &product-name; WDDM Video
448 driver manually. Open Device Manager, and check whether the
449 Display Adapter is named "&product-name; Graphics Adapter ..".
450 If not, there is nothing to be done. If it is, right-click the
451 &product-name; Graphics Adapter in Device Manager, select
452 <emphasis role="bold">Uninstall</emphasis>, check
453 <emphasis role="bold">Delete the Driver Software for this
454 Device</emphasis> and click
455 <emphasis role="bold">OK</emphasis>. Once uninstallation is
456 done, start Device Manager, go to the
457 <emphasis role="bold">Action</emphasis> menu and select
458 <emphasis role="bold">Scan for Hardware Change</emphasis>s to
459 ensure that the correct Windows default driver be picked up
460 for the Graphics adapter.
461 </para>
462 </listitem>
463
464 <listitem>
465 <para>
466 Neither <emphasis>virtio</emphasis> nor <emphasis>Intel
467 PRO/1000 </emphasis> drivers for <emphasis role="bold">Windows
468 XP guests</emphasis> support segmentation offloading.
469 Therefore Windows XP guests have slower transmission rates
470 comparing to other guest types. Refer to MS Knowledge base
471 article 842264 for additional information.
472 </para>
473 </listitem>
474
475 <listitem>
476 <para>
477 <emphasis role="bold">Guest Additions for OS/2.</emphasis>
478 Seamless windows and automatic guest resizing will probably
479 never be implemented due to inherent limitations of the OS/2
480 graphics system.
481 </para>
482 </listitem>
483
484 <listitem>
485 <para>
486 Some guest operating systems predating ATAPI CD-ROMs may
487 exhibit long delays or entirely fail to boot in certain
488 configurations. This is most likely to happen when an
489 IDE/ATAPI CD-ROM exists alone on a primary or secondary IDE
490 channel.
491 </para>
492
493 <para>
494 Affected operating systems are MS OS/2 1.21: fails to boot
495 with an error message referencing COUNTRY.SYS and MS OS/2 1.3:
496 long boot delays. To avoid such problems, disable the emulated
497 IDE/ATAPI CD-ROM. The guest OS cannot use this device, anyway.
498 </para>
499 </listitem>
500
501 </itemizedlist>
502
503 </sect1>
504
505</chapter>
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