Comment 6 for bug 1503310

I'm experiencing the same issue. Firefox is severely impacted: changing tabs would not refresh the display on a ~1/4 probability. I could reproduce once or twice that problem on the console application. Gedit is nearly unusable, as writing text often does not refresh the actual content. I don't have problems with Chrome.

Ubuntu 12.04.5 LTS, 3.13.0-65-generic
Window manager: Unity 3d

+------------------------------------------------------+
| NVIDIA-SMI 340.93 Driver Version: 340.93 |
|-------------------------------+----------------------+----------------------+
| GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
|===============================+======================+======================|
| 0 GeForce 310 Off | 0000:01:00.0 N/A | N/A |
| 25% 55C P0 N/A / N/A | 444MiB / 511MiB | N/A Default |
+-------------------------------+----------------------+----------------------+

+-----------------------------------------------------------------------------+
| Compute processes: GPU Memory |
| GPU PID Process name Usage |
|=============================================================================|
| 0 Not Supported |
+-----------------------------------------------------------------------------+