I can easily reproduce this by triggering a nouveau bug by doing suspend/resume with a G92 (NV92) card.
See https://bugs.launchpad.net/bugs/1111884 with the attached https://launchpadlibrarian.net/130058311/nouveau.txt .
I'll be glad to try an alternate xserver-xorg-video-nouveau for raring.
I can easily reproduce this by triggering a nouveau bug by doing suspend/resume with a G92 (NV92) card.
See https:/ /bugs.launchpad .net/bugs/ 1111884 with the attached https:/ /launchpadlibra rian.net/ 130058311/ nouveau. txt .
I'll be glad to try an alternate xserver- xorg-video- nouveau for raring.