Comment 25 for bug 1515539

I am experiencing this as well, ever since I switched from UXA to SNA. With UXA I had other issues, and SNA seems faster on my 2nd gen intel, so I'd really prefer to stick with it.

I'm not sure exactly how to reproduce it, but in my case, it seems to have something to do with suspend/resume action. I can work for 10 hours straight without glitches, but few minutes after I resume from sleep, I start getting fonts messed up (missing letters or displaying rectangles instead of letters) and GTK apps look broken (pretty much how reporter's screenshots shows it). Restarting X solves the issue, until I sleep/resume again. Maybe it has nothing to do with sleep/resume, but that's just what I noticed. I never had this issue working straight after X starts, but only after sleep/resume. In my case, about 7/10 times after sleep/resume breaks the driver within 20-30 minutes.

I reported this recently on irc, and Chris suggested I try running 3.2 kernel (based on my suspend/resume notice). Unfortunately, my wifi driver doesn't work with 3.2 kernel and I couldn't stay up long enough to experience the issue.

As suggested in previous comment, I now tried setting COGL_ATLAS_DEFAULT_BLIT_MODE to "framebuffer". I'll report back in a couple of days with results.

Thinkpad W520
CPU: i7-2720QM
BIOS: Lenovo, Version: 8BET62WW (1.42 ), Firmware Revision: 1.36
OS & DE: Ubuntu 15.10, Gnome 3.18
Kernel: 4.2.0-18-generic, x86_64
Xorg: 7.7
Xserver: 1.17.2
Mesa: 11.0.2

No errors in dmesg or xorg.0.log.