Commen=
t # 5
on bug 10898=
0
from Ilia Mirkin
This is quite confusing. It would appear it's happening in vol=
t's oneinit
function:
[ 17.475047] kernel: nouveau 0000:08:00.0: volt: init running...
[ 17.475749] kernel: nouveau 0000:08:00.0: volt: one-time init running...
[ 17.476499] kernel: nouveau 0000:08:00.0: volt: couldn't find speedo val=
ue,
volting not possible
[ 17.476513] kernel: nouveau 0000:08:00.0: bus: MMIO write of ffff881f FA=
ULT
at 6013d4 [ IBUS ]
[ 17.477150] kernel: nouveau 0000:08:00.0: volt: one-time init completed =
in
668us
[ 17.478504] kernel: nouveau 0000:08:00.0: volt: current voltage unknown
[ 17.479174] kernel: nouveau 0000:08:00.0: volt: init completed in 3426us
However nothing in there could cause that... of course the notification only
comes in later (via interrupt servicing), so it may not be directly correla=
ted
to these messages.
Auditing the other common suspects, nothing in the bios will try to use any=
of
the IO/etc commands which generally trigger these.
AHA! I have a theory.
devinit's preinit calls nvkm_lockvgac(). Can you try commenting that out?
drivers/gpu/drm/nouveau/nvkm/subdev/devinit/base.c:nvkm_devinit_preinit -- =
just
comment out the call to "nvkm_lockvgac".
If that doesn't help, then I'm out of ideas, and we have to take more of a
shotgun approach -- add a
WARN() at the top of drivers/gpu/drm/nouveau/nvkm/engine/disp/vga.c:nvkm_wr=
port
and rdport, and see who's calling them. No one should be on a GF117, I beli=
eve.