[Nouveau] drm-nouveau-next - write trapped by fbcon

[Ilia Mirkin]

On Thu, Dec 5, 2013 at 10:17 AM, Bruno Prémont
<bonbons at linux-vserver.org> wrote:
> Hi,
>
> With drm-nouveau-next branch on top of 3.13-rc2 and a few sound commits
> I get following errors in kernel log (repeating much more often).
> (once there was a corrupted fbcon with matrix-like strings of
> unrecognizable glyph-strings hanging down from screen top border)
>
> These errors do stop once I switch to Xorg.
>
> [   13.825627] nouveau E[     PFB][0000:02:00.0] trapped write at 0x0000408280 on channel 0x0000fee0 [unknown] BAR/PFIFO_WRITE/FB reason: PAGE_NOT_PRESENT
> [   13.826506] nouveau E[     PFB][0000:02:00.0] trapped write at 0x0000408280 on channel 0x0000fee0 [unknown] BAR/PFIFO_WRITE/FB reason: PAGE_NOT_PRESENT
> [   13.827319] nouveau E[     PFB][0000:02:00.0] trapped write at 0x0000408280 on channel 0x0000fee0 [unknown] BAR/PFIFO_WRITE/FB reason: PAGE_NOT_PRESENT
> [   13.828139] nouveau E[     PFB][0000:02:00.0] trapped write at 0x0000408280 on channel 0x0000fee0 [unknown] BAR/PFIFO_WRITE/FB reason: PAGE_NOT_PRESENT
> [   13.828957] nouveau E[     PFB][0000:02:00.0] trapped write at 0x0000400300 on channel 0x0000fee0 [unknown] BAR/PFIFO_WRITE/FB reason: PAGE_NOT_PRESENT
>
> System MBA2,1 with:
> 02:00.0 VGA compatible controller [0300]: NVIDIA Corporation C79 [GeForce 9400M] [10de:0870] (rev b1)

Do you also see these in 3.13-rc2 +
http://cgit.freedesktop.org/nouveau/linux-2.6/commit/?h=drm-nouveau-next&id=a7e4201f0f7d47e03b851f06f8987856e8d33083
? If not, you can reorder the patches (git rebase -i) and bisect the
rest. Basically the GPU is trying to write to some address that is
either completely bogus or is stale, and its internal MMU won't let
it.

  -ilia