[vbox-dev] IFramebuffer resolution limits

Vitali Pelenjow Vitali.Pelenjow at oracle.com
Thu Sep 18 19:23:41 GMT 2014


it is possible to add arbitrary custom resolutions using the 
vboxcontrol.exe (from the guest additions):
vboxcontrol addcustommode <width> <height> <bpp>
This mode will then be available in the "Adjust Resolution" dialog.

Also you could try to set an arbitrary high resolution mode either from 
the guest:
vboxcontrol setvideomode <width> <height> <bpp> <screen>
where screen = 0 is the primary display.
Or from the host using the VBoxManage controlvm setvideomodehint command.


Rūdolfs Bundulis wrote:
> Hi,
> another question on IFramebuffer and monitors, yesterday while playing 
> around with my headless implementation I saw that a guest Windows 7 
> actually offers resolutions up to 6400x1200 (I hope I remember 
> correctly) in the "Adjust Resolution" dialog, I assume that comes from 
> the fact that I always return supported as true in 
> IFramebuffer::videoModeSupported (I didn't actually check if resize to 
> this mode would happen). This is also quite interesting since then 
> that would actually give me a way of having a high resolution surface 
> that I could internally split into 1920 x something tiles. But at 
> least from what I saw it looked like only the width was large, not the 
> height, I would have expected a 6400 x something (something being in 
> 16:9 or 4:3 proportion), can anyone advise me on are these modes 
> actually working and can I get a high 16:9/4:3 resolution mode?
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