The performance for accesses to shared folders from a Windows guest might be decreased due to delays during the resolution of the Oracle VM VirtualBox shared folders name service. If a Windows 98 VM is configured to use the emulated USB tablet absolute pointing device , the coordinate translation may be incorrect and the pointer is restricted to the upper left quarter of the guest's screen. To work around the problem, use the following command:. If a Windows guest is a member of an Active Directory domain and the snapshot feature of Oracle VM VirtualBox is used, it could be removed from the Active Direcory domain after you restore an older snapshot.
This is caused by automatic machine password changes performed by Windows at regular intervals for security purposes. Windows 3. While Windows 3. SYS limitation. It is possible for Windows 3. Some Linux guests may cause a high CPU load even if the guest system appears to be idle.
This can be caused by a high timer frequency of the guest kernel. Some Linux distributions, for example Fedora, ship a Linux kernel configured for a timer frequency of Hz. We recommend to recompile the guest kernel and to select a timer frequency of Hz. Hence, such kernels support a lower timer frequency without recompilation. The Linux kernel version 2. Please use a kernel version 2. Guest desktop services in guests running the X11 window system such as Oracle Solaris and Linux, are provided by a guest service called VBoxClient , which runs under the ID of the user who started the desktop session and is automatically started using the following command lines when your X11 user session is started if you are using a common desktop environment such as Gnome or KDE.
If a particular desktop service is not working correctly, it is worth checking whether the process which should provide it is running. The VBoxClient processes create files in the user's home directory with names of the form.
It can happen due to misconfiguration that these files are created owned by root and not deleted when the services are stopped, which will prevent them from being started in future sessions. If the services cannot be started, you may wish to check whether these files still exist. This is a bug in Oracle Solaris 10 which affects specific physical and virtual configurations.
It is caused by trying to read microcode updates from the boot disk when the disk interrupt is reassigned to a not yet fully initialized secondary CPU.
Disk reads will time out and fail, triggering delays of about 45 seconds and warnings. Alternative solutions include restricting the number of virtual CPUs to one or possibly using a different storage controller. This enables Oracle VM VirtualBox to share a common configuration among different virtual machine processes and provide several user interface options based on a common architecture.
Note that it should never be started by the end user. When the last process disconnects from the COM server, it will terminate itself after some seconds. In some cases, such as when a virtual machine is terminated unexpectedly, the COM server will not notice that the client is disconnected and stay active for a longer period of 10 minutes or so, keeping the configuration files locked.
In other rare cases the COM server might experience an internal error and subsequently other processes fail to initialize it. In case you have assigned a physical CD or DVD drive to a guest and the guest does not notice when the medium changes, make sure that the Windows media change notification MCN feature is not turned off.
This is represented by the following key in the Windows registry:. Certain applications may disable this key against Microsoft's advice. If it is set to 0, change it to 1 and reboot your system. If connecting to a Virtual Machine using the Microsoft RDP client, called a Remote Desktop Connection, there can be large delays between input such as moving the mouse over a menu and output. The interval can be decreased by setting a Windows registry key to smaller values than the default of The unit for its values is milliseconds.
Values around 20 are suitable for low-bandwidth connections between the RDP client and server. Values around 4 can be used for a gigabit Ethernet connection. Generally values below 10 achieve a performance that is very close to that of the local input devices and screen of the host on which the Virtual Machine is running. Depending whether the setting should be changed for an individual user or for the system, set either of the following.
This is caused by a flaw in the Windows cache manager component, and causes sluggish host system response for several minutes, followed by a "Delayed Write Failed" error message in the system tray or in a separate message window. The guest is blocked during that period and may show error messages or become unstable. While this will decrease guest disk performance, especially writes, it does not affect the performance of other applications running on the host.
If no bridged adapters show up in the Networking section of the VM settings, this typically means that the bridged networking driver was not installed properly on your host. This could be due to the following reasons:.
The maximum allowed filter count was reached on the host. In this case, the MSI log would mention the 0xa error code returned on NetFlt network component install, as follows:. You can try to increase the maximum filter count in the Windows registry using the following key:. The maximum number allowed is The INF cache is corrupt. As root, check the output of the dmesg command to find out why the load failed.
Most probably the kernel disagrees with the version of gcc used to compile the module. Make sure that you use the same compiler that was used to build the kernel. If you have configured a virtual machine to use the host's CD or DVD drive or floppy disk drive, but this does not appear to work, make sure that the current user has permission to access the corresponding Linux device file.
On most distributions, the user must be added to a corresponding group, usually called cdrom or cdrw or floppy. If the experimental CD or DVD writer support is enabled with an incorrect host or guest configuration, it is possible that any attempt to access the CD or DVD writer fails and simply results in guest kernel error messages for Linux guests or application error messages for Windows guests.
Special care must be taken to use the correct device. Since this setup is very common, it is likely that the default configuration of the guest works as expected.
They are only accessible from the user account they are running under. While it is running, the configuration files are locked. In case there are communication problems, such as an Oracle VM VirtualBox application cannot communicate with VBoxSVC , terminate the daemons and remove the local domain socket directory. If USB is not working on your Linux host, make sure that the current user is a member of the vboxusers group.
Please keep in mind that group membership does not take effect immediately but rather at the next login. If available, the newgrp command may avoid the need for a logout and login.
If adding this parameter to your GRUB or LILO configuration makes the kernel fail to boot, with an error message such as failed to mount the root partition , then you have probably run into a memory conflict of your kernel and initial RAM disk. This can be solved by adding the following parameter to your GRUB configuration:. Chapter Table of Contents Procedures and Tools Categorizing and Isolating Problems Collecting Debugging Information VM Core Format General Troubleshooting Performance Variation with Frequency Boosting Windows Guests No USB 3.
Windows Installation Failures No Networking in Windows Vista Guests Linux and X11 Guests Buggy Linux 2. Oracle Solaris Guests Windows Hosts Bridged Networking Adapters Missing Linux Hosts Linux Kernel Module Refuses to Load USB Not Working Linux Kernel vmalloc Pool Exhausted Oracle Solaris Hosts Procedures and Tools.
Categorizing and Isolating Problems. Collecting Debugging Information. Warning Use the VM debugger at your own risk. Using a debugger console window displayed alongside the VM Using the telnet protocol on port VM Core Format.
General Troubleshooting. Sometimes it flickers a bit but then back to black page again. Installed guest additions 4. Windowed mode seems ok but fullscreen mode gets a black screen. If using fullscreen i can get it to draw correctly only for "active" areas, for example if i have the desktop open i will see a black screen, if i right click to open the context menu i will then see the context menu being drawn correctly but everything around it is still black.
If i left-click on the desktop to get the "selection rectangle" everything within the rectangle will be drawn correctly. My VirtualBox version is 4. I am also having the flicker issue. This happens when I move the mouse pointer. None of the following VBoxGuestAdditions worked for me:. The issue seems to be with the Direct 3D option during the installation.
The 4. Higher versions do not give you this option. Same problem exists on Windows8 final. After Installation of Guest Additions - you could not navigate or open the desktop Please try the latest VBox 4. If the problem is still there, please attach a VM log file from VBox 4. Re: Windows 8? Other possible problems: crashing, BSOD in the Guest and other random stuff that will cause it to not work.
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