Comment 74 for bug 146859

The comments in this bug are raising a range of different issues for different cards (DRI, UXA/EXA accel vs noaccel, different chipsets are what not). Lumping together a lot of issues mostly makes the bug reports messy and unusable. There is no point in posting further comments to _this_ particular bug.

Now, if anyone had better experience in a previous version of Ubuntu (better performance, better handling of dual screen etc), then we're dealing with a new regression for that hardware. In so, please use the command "ubuntu-bug xserver-xorg-video-intel" to file a _new_ bug report that deals with your issue on your chipset specifically.

As for the question about the hw/sw driver limitation.. Basically for gen3 hardware and earlier (that's 915/945 and older) there is a _hardware_ limitation, however, if you go to great lengths it's technically possible to circumvent that limitation using a software workaround. Doing so would likely incur a significant runtime performance penalty and it would also be a significant amount of work for very little gain compared to other potential efforts... that said, just as you point out, it can be done. The upstream developers have at this time, however, opted to prioritize things like UXA, KMS, DRI2 etc and have basically said they are unlikely to hack around the hw limitation. If someone is prepared to step up and create a driver capable of >2048 sized DRI for these 915/945 and older cards, we'd be happy to ship it of course but if there isn't anyone interested in implementing it there is no point in having a bug tracking it. Thanks.