I have the same issue but with an nvidia card ( GTX 560 ti )
Intel q6600
P45 chipset
Ubuntu 13.10
Using compiz with gnome-flashback
Kernel : Linux version 3.11.0-14-generic (buildd@allspice) (gcc version 4.8.1 (Ubuntu/Linaro 4.8.1-10ubuntu8) ) #21-Ubuntu SMP Tue Nov 12 17:04:55 UTC 2013
I have the same issue but with an nvidia card ( GTX 560 ti )
Intel q6600
P45 chipset
Ubuntu 13.10
Using compiz with gnome-flashback
Kernel : Linux version 3.11.0-14-generic (buildd@allspice) (gcc version 4.8.1 (Ubuntu/Linaro 4.8.1-10ubuntu8) ) #21-Ubuntu SMP Tue Nov 12 17:04:55 UTC 2013