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.
** Changed in: mesa (Ubuntu Jaunty)
Status: Confirmed => Fix Released
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No dri (and therefore no compiz) for virtual screen greater than 2048x2048
https://bugs.launchpad.net/bugs/146859
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