Intel: Default for "Virtual"

Keith Whitwell keith at
Sun Aug 26 08:28:04 PDT 2007

Chase Douglas wrote:
> Andreas Schildbach wrote:
>> Version 2.1.1-0ubuntu2 seems to set the default Virtual size (maximum 
>> screen size) to 1920 x 1920, if there is no entry in xorg.conf. I take 
>> it the maximum screen size for the i915 chipset family is 2048 x 2048, 
>> so why not have it at that? This would make dualscreen setups a bit easier.
> The default settings is found by taking the largest resolution in either 
> x or y dimension and making a square from that. This allows for easy 
> rotation should you want to do so.
> I believe you should be able to do dual screen up to 8192x8192, though 
> only through two monitors (Only two pipes are available for output), but 
> that 3D acceleration is only supported up to 2048x2048. Thus as soon as 
> you set your virtual size above 2048x2048, you lose 3D acceleration (I'm 
> working to fix this).

Using private backbuffers (eg as prototyped on the Mesa i915 privbuffers 
branch) would mean that you only lost 3d once the window size exceeded 
2kx2k, regardless of the screen virtual size.


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