People are piling on reporting it here:
I do not know exactly which package broke it, but it seems most if not all are on Radeon systems with kernel 3.5 which I guess is an indication that they got it pulled in through the xorg-edgers PPA (my speculation at least).
same for me.
ubuntu 12.04, 64bit. xorg-edgers ppa but with nouveau driver.
Please attach your xorg log, dmesg output, and glxinfo output. Also, it would be helpful if you could track down what package(s) caused the problem.
If it broke both AMD and NV hw, it's most likely an Ubuntu specific packaging issue rather than an upstream driver issue and should probably be opened as an ubuntu bug.
Or it could be a regression in code shared between the drivers. Mesa seems most likely at this point. Would be great if somebody could confirm that this happen with current upstream Git master but not with the 8.0 branch, and bisect.
I haven't been able to bisect it yet but 8.0 branch is fine, master is fine as of may 29th up to f92b2e5e90f456491fc15b3b9612381a83726606 (just before out of tree builds were massively broken) and bad at 22d032707e888dc9718d66c1f59e6efbc04ab9bd (first time I could build it out of tree)
I'm pretty sure I saw this on Ubuntu 12.04 on Intel Ivybridge when installing xorg-edgers (which comes with Mesa master). Smells like a core Mesa regression. (This was on someone else's machine, though, so unfortunately I won't be able to reproduce or debug this further...)
Created attachment 64376 [details]
Björns xorg log
Created attachment 64377 [details]
Created attachment 64378 [details]
I have xorg-edgers ppa verison on sandy bridge intel graphics.
I'm experiencing this bug too with xorg-edgers ppa, Ubuntu 12.10, Unity 6.0 series.
Created attachment 64715 [details]
Vasco's Xorg log
Created attachment 64716 [details]
Created attachment 64717 [details]
Added my own logs, hope this also helps. On Sandy Bridge graphics.
I'm also affected. On two different machines (both radeon based):
Ubuntu quantal, intel [GM965/GL960] graphics card.
Downgrading of libgl1-mesa-dri from xorg-edgers
to original quantal version helps:
apt-cache policy libgl1-mesa-dri
500 http://ppa.launchpad.net/xorg-edgers/ppa/ubuntu/ quantal/main i386 Packages
*** 8.0.4-1ubuntu1 0
500 http://ru.archive.ubuntu.com/ubuntu/ quantal/main i386 Packages
This is now fixed for me on intel at least as of a 20120814 checkout up to b4977197
I can confirm this is fixed on Intel hardware (HD Graphics 3000).
closing as fixed