Comment 2 for bug 372741

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.