Comment # 24 on bug 60680 from Pekka Paalanen

Tried the complete kernel from nouveau/drm-nouveau-next
(v3.13-rc8-665-g1139ffb) which contains the commit

commit f87cd8b695d372087685976460fac1ec6ba2fca9
Author: Ilia Mirkin <imirkin@alum.mit.edu>
Date:   Sun Jan 19 04:18:15 2014 -0500

    drm/nouveau/devinit: lock/unlock crtc regs for all devices, not just
pre-nv50

    Also make nv_lockvgac work for nv50+ devices. This should fix
    IO_CONDITION and related VBIOS opcodes that read/write the crtc regs.

    See https://bugs.freedesktop.org/show_bug.cgi?id=60680

    Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
    Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

which apparently is supposed to fix the issue.

This kernel works, and the issue is fixed.

Thank you!