234 lines
11 KiB
XML
234 lines
11 KiB
XML
<?xml version='1.0' encoding='UTF-8'?>
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<!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
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<topic xml:lang="en-us" id="KnownProblems">
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<title>Known Issues</title>
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<body>
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<p>The following section describes known problems with this release of <ph
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conkeyref="vbox-conkeyref-phrases/product-name"/>. Unless marked otherwise, these issues are planned to be fixed
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in later releases. </p>
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<ul>
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<li>Saved states and online snapshots created on Arm VMs in <ph conkeyref="vbox-conkeyref-phrases/product-name"/> 7.1 will not be usable in later releases. Saved states within 7.1 are working as expected.</li>
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<li>Internal networking on macOS hosts doesn't work between VMs run by different users.</li>
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<li>
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<p>Poor performance when using <ph conkeyref="vbox-conkeyref-phrases/product-name"/> and <b outputclass="bold"
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>Hyper-V</b> on the same host. To fix this, certain Windows features like "Hyper-V Platform", "Virtual
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Machine Platform" and "Windows Hypervisor Platform" must be turned off, followed by a host reboot. </p>
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<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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<p>Additionally, the Microsoft Device Guard and Credential Guard hardware readiness tool might have to be used
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in order to turn off more features. For example, by running the following command: </p>
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<pre xml:space="preserve">.\DG_Readiness_Tool_vX.X.ps1 -Disable -AutoReboot</pre>
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<note>
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<p>Disabling Device Guard and Credential Guard features will have an impact on the overall security of the
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host. Please contact your Administrator beforehand regarding this. </p>
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</note>
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</li>
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<li>
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<p>
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The following <b outputclass="bold">Guest SMP (multiprocessor)
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limitations</b> exist:
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</p>
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<ul>
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<li>
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<p><b outputclass="bold">Poor performance</b> with
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32-bit guests on AMD CPUs. This affects mainly Windows and
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Oracle Solaris guests, but possibly also some Linux kernel
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revisions. Partially solved for 32-bit Windows NT, 2000,
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XP, and 2003 guests. Requires the Guest Additions to be
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installed.
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</p>
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</li>
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<li>
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<p><b outputclass="bold">Poor performance</b> with
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32-bit guests on certain Intel CPU models that do not
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include virtual APIC hardware optimization support. This
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affects mainly Windows and Oracle Solaris guests, but
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possibly also some Linux kernel revisions. Partially
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solved for 32-bit Windows NT, 2000, XP, and 2003 guests.
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Requires the Guest Additions to be installed.
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</p>
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</li>
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</ul>
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</li>
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<li>
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<p><b outputclass="bold">NX (no execute, data execution
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prevention)</b> only works for guests running on 64-bit
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hosts and requires that hardware virtualization be enabled.
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</p>
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</li>
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<li>
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<p><b outputclass="bold">Guest control.</b> On Windows
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guests, a process started using the guest control execute
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support will not be able to display a graphical user interface
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<i>unless</i> the user account under which it is
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running is currently logged in and has a desktop session.
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</p>
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<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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open the group policy editor on the command line by typing <userinput>gpedit.msc</userinput>, open the key
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<codeph>Computer Configuration\Windows Settings\Security Settings\Local Policies\Security Options</codeph>
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and change the value of <codeph>Accounts: Limit local account use of blank passwords to console logon
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only</codeph> to Disabled. </p>
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</li>
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<li>
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<p><b outputclass="bold">Compacting virtual disk images is
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limited to VDI files.</b> The <userinput>VBoxManage
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modifymedium --compact</userinput> command is currently only
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implemented for VDI files. At the moment the only way to
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optimize the size of a virtual disk images in other formats,
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such as VMDK or VHD, is to clone the image and then use the
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cloned image in the VM configuration.
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</p>
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</li>
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<li>
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<p><b outputclass="bold">OVF import/export:</b>
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</p>
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<ul>
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<li>
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<p>OVF localization, with multiple languages in a single OVF file, is not yet supported. </p>
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</li>
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<li>
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<p>Some OVF sections like StartupSection, DeploymentOptionSection, and InstallSection are ignored. </p>
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</li>
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<li>
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<p>OVF environment documents, including their property sections and appliance configuration with ISO images,
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are not yet supported. </p>
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</li>
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<li>
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<p>Remote files using HTTP or other mechanisms are not yet supported. </p>
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</li>
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</ul>
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</li>
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<li>
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<p>The RDP server in the <ph conkeyref="vbox-conkeyref-phrases/product-name"/> extension pack supports only
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audio streams in format 22.05kHz stereo 16-bit. If the RDP client requests any other audio format there will
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be no audio. </p>
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</li>
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<li>
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<p>Preserving the aspect ratio in scale mode works only on Windows hosts and on macOS hosts. </p>
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</li>
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<li>
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<p>On <b outputclass="bold">macOS hosts</b>, the following features are not yet implemented: </p>
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<ul>
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<li>
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<p>
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Numlock emulation
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</p>
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</li>
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<li>
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<p>
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CPU frequency metric
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</p>
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</li>
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<li>
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<p>
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Memory ballooning
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</p>
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</li>
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</ul>
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</li>
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<li>
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<p><b outputclass="bold">macOS/Arm 64 (Apple silicon) host package</b>
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<ul id="ul_ddr_kzn_hcc">
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<li>
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<p>x86-based guest operating systems will not run.</p>
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</li>
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<li>
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<p>Arm(AArch64) guests only. Arm 32 is not supported at present.</p>
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</li>
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<li>
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<p>Arm hosts have limitations with sound, storage, graphics, guest additions and unattended
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installation.</p>
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</li>
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</ul></p>
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</li>
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<li>
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<p><b outputclass="bold">Mac OS X guests:</b>
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</p>
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<ul>
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<li>
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<p>Mac OS X guests can only run on a certain host hardware. For details about license and host hardware
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limitations. See <xref href="intro-macosxguests.dita">Mac OS X Guests</xref> and check the Apple software
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license conditions. </p>
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</li>
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<li>
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<p><ph conkeyref="vbox-conkeyref-phrases/product-name"/> does not provide Guest Additions for Mac OS X at
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this time. </p>
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</li>
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<li>
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<p>The graphics resolution currently defaults to 1024x768 as Mac OS X falls back to the built-in EFI display
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support. See <xref href="efividmode.dita">Video Modes in EFI</xref> for more information on how to change
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EFI video modes. </p>
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</li>
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<li>
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<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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release. </p>
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</li>
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<li>
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<p>Depending on your system and version of Mac OS X, you might experience guest hangs after some time. This
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can be fixed by turning off energy saving. Set the timeout to "Never" in the system preferences. </p>
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</li>
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<li>
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<p>By default, the <ph conkeyref="vbox-conkeyref-phrases/product-name"/> EFI enables debug output of the Mac
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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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fatal. They would also show when using a physical Apple Macintosh computer. You can turn off these
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messages by using the following command: </p>
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<pre xml:space="preserve">$ VBoxManage setextradata <varname>VM-name</varname> "VBoxInternal2/EfiBootArgs" " "</pre>
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<p>
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To revert to the previous behavior, use the following
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command:
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</p>
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<pre xml:space="preserve">$ VBoxManage setextradata <varname>VM-name</varname> "VBoxInternal2/EfiBootArgs" ""</pre>
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</li>
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<li>
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<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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option in <codeph>VBoxInternal2/EfiBootArgs</codeph> extradata. </p>
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</li>
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</ul>
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</li>
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<li>
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<p>
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<b outputclass="bold">Oracle Solaris hosts:</b>
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</p>
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<ul>
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<li>
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<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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</li>
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<li>
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<p>Host Webcam passthrough is restricted to 640x480 frames at 20 frames per second due to limitations in the
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Oracle Solaris V4L2 API. This may be addressed in a future Oracle Solaris release. </p>
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</li>
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<li>
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<p>No ACPI information, such as battery status or power source, is reported to the guest. </p>
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</li>
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<li>
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<p>No support for using wireless adapters with bridged networking. </p>
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</li>
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<li>
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<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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</li>
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</ul>
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</li>
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<li>
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<p>Neither virtio nor Intel PRO/1000 drivers for <b outputclass="bold">Windows XP guests</b> support
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segmentation offloading. Therefore Windows XP guests have slower transmission rates comparing to other guest
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types. Refer to MS Knowledge base article 842264 for additional information. </p>
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</li>
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<li>
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<p><b outputclass="bold">Guest Additions for OS/2.</b>
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Seamless windows and automatic guest resizing will probably
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never be implemented due to inherent limitations of the OS/2
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graphics system.
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</p>
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</li>
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<li>
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<p>Some guest operating systems predating ATAPI CD-ROMs may exhibit long delays or entirely fail to boot in
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certain configurations. This is most likely to happen when an IDE/ATAPI CD-ROM exists alone on a primary or
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secondary IDE channel. </p>
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<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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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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cannot use this device, anyway. </p>
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</li>
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</ul>
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</body>
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</topic>
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