Created attachment 123085 [details]
nouveau bugs

Having random lockups on a GTX 660 Ti (NVE4), since kernel 4.1 I guess, using
DRI2.
[    0.267666] nouveau 0000:02:00.0: NVIDIA GK104 (0e4030a2)
[    0.378583] nouveau 0000:02:00.0: bios: version 80.04.4b.00.1a
[    0.379302] nouveau 0000:02:00.0: fb: 2048 MiB GDDR5

Now on gentoo ~amd64 using:

sys-kernel/gentoo-sources-4.5.1
x11-base/xorg-server-1.18.3
x11-drivers/xf86-video-nouveau-1.0.12

Also tried Karol Herbst reclocking branch v4
(https://github.com/karolherbst/nouveau/tree/stable_reclocking_kepler_v4),
reclocked to pstate 07 and tried all 3 boost states. All hang sooner or later.

Will continue testing other pstates and boost configurations.

Sometimes the kernel log becomes corrupted, but I managed to get a working log
(attached).