[PATCH 0/1] [Jaunty] LP#314928 -- AGP aperture MTRR for Intel i915 family

[Andy Whitcroft]

On Wed, May 06, 2009 at 02:49:40PM +0100, Andy Whitcroft wrote:
> We have been seeing a number of bugs relating to Intel graphics
> performance.  Rather than being one single bug this seems to be a slew
> of little problems each chipping away at the overall speed.  One such
> problem is the MTRR marking the AGP aperture as write-combining is missing.
> Particularly when tiling is enabled, this has a significant performance
> impact.  Noticible visually in combiz effects, and even causing tearing on
> video playback for some users.
> 
> Fixes things up for me, and reported to fix testers on the bug.
> 
> Proposing for SRU to Jaunty.

It seems that testing has thrown up a problem with this patch.  Will
respin and resubmit.

-apw