*** This bug is a duplicate of bug 146298 ***
https://bugs.launchpad.net/bugs/146298
GM45 uses the same code as the 965 chipset so this is a dupe of 146298.
Let me give you a quick summary of what has happened so far. Note that
upstream mesa master for (for 7.5/7.6) has fixed the issue but mesa
developers did not cherry pick this fix for the mesa 7.4 stable branch
because adding this fix to 7.4 pulls in another commit which in turn
unfortunately introduces a breakage for radeon r300 chipsets. We had the
>2048 DRI fix for 965/Gx45 cherry picked in ubuntu however but as you
point out above it was dropped before release, the reason for the drop
is explained here:
https://bugs.launchpad.net/ubuntu/+source/mesa/+bug/146298/comments/52
Although, in the end we actually worked around the freeze bug using a
hardcoded virtual size so it might be possible to re-activate the
103_bump_965_texture_limit.diff cherry pick. However, please understand
that we're dealing with changes that affect _a lot_ of users and our
first priority is to ensure that the intel driver does not freeze and
only while that objective is met we'll target other potential fixes. The
freeze / GPU lockup is a significantly nastier bug than not being able
to use compiz on >2048 monitors using 965/GM45 and later cards.
Running the PPA version is probably the best solution for you at this
time. Rest assured this issue is well known, please feel free to join
#ubuntu-x on FreeNode IRC if you want more information. Thank you.
** This bug has been marked a duplicate of bug 146298
[i965] intel gm965 compiz dual head issues
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[GM45] Compiz does not start when resolution is more than 2048
https://bugs.launchpad.net/bugs/372741
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