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Virtualbox - Information
The virtual machine window is optimized to work in 32 bit color
mode but the virtual display is currently set to 16 bit.
Please open the display properties dialog of the guest OS and
select a 32 bit color mode, if it is available, for best possible
performance of the virtual video subsystem.
Note. Some operating systems, like OS/2, may actually work in
32 bit mode but report it as 24 bit (16 million colors). You may try
to select a different color mode to see if this message disappears
or you can simply disable the message now if you are sure the
required color mode (32 bit) is not available in the guest OS.
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Section "Screen"
Identifier "Default Screen"
Device "VirtualBox graphics card"
Monitor "Generic Monitor"
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "1280x800" "1024x768" "800x600" "640x480"
EndSubSection
EndSection