[Nouveau] GeForce 6100 (NV4E) & nouveau regression in 3.12

[Ilia Mirkin]

On Sun, Feb 16, 2014 at 10:17 AM, Rafał Miłecki <zajec5 at gmail.com> wrote:
> 2014-02-11 11:41 GMT+01:00 Ilia Mirkin <imirkin at alum.mit.edu>:
>> (b) bisect. you can (almost) definitely restrict the bisect to
>> drivers/gpu/drm/nouveau. if you have additional computational power, i
>> would recommend looking into distcc for speeding up the compiles. it
>> may be interesting to also try 3.6.x since 3.7 received a pretty big
>> rewrite. but a git bisect is a lot more direct in figuring these
>> things out :)
>>
>> After I watched your video, it definitely brought back memories of
>> another bug or perhaps email on this list a while back (definitely
>> within the past year), but unfortunately I can't quite place it :(
>
> I've finally bisected between 3.10 and 3.11:
>
> 78ae0ad403daf11cf63da86923d2b5dbeda3af8f is the first bad commit
> commit 78ae0ad403daf11cf63da86923d2b5dbeda3af8f
> Author: Ben Skeggs <bskeggs at redhat.com>
> Date: Wed Aug 21 11:30:36 2013 +1000
>
>     drm/nv04/disp: fix framebuffer pin refcounting
>
> I've booted that commit and one commit older few times. Every time I
> booted 78ae0ad I got corruption. Every time I booted 6ff8c76 (it's the
> earlier commit), it was OK.

But I bet if you restart X, you get a backtrace, right?

>
> Ben: any idea why this commit caused regression for my hardware? From
> the commit message I assume it was supposed to affect some ancient
> nv04 hardware only. Did it accidentally touch my nv4e path code maybe?

All pre-nv50 hardware (including your nv4e) use this path.

  -ilia