[Nouveau] [Bug 56615] [NVD9] Unable to start X on ThinkPad T420s laptop

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=56615

--- Comment #10 from Mark Cave-Ayland <mark.cave-ayland at ilande.co.uk> ---
Based upon the suggestions that this is a problem with the kernel module, I've
now setup and built a full dev environment.

With this in place, I've just done a build of git master (commit
cd55d81fdb49c9113792c3b361c125e82091d6c4) from
git://anongit.freedesktop.org/nouveau/linux-2.6 and unfortunately I see exactly
the same problem as before :/

Incidentally can anyone explain what the following items in dmesg represent?

[   26.204990] nouveau W[  PGRAPH][0000:01:00.0] disabled, PGRAPH=1 to enable
[   29.873280] nouveau  [     DRM] EvoCh: chid 1 mthd 0x0080 data 0x00000000
0x00005080 0x0000000d
[   29.876287] [sched_delayed] sched: RT throttling activated
[   33.870186] nouveau  [     DRM] EvoCh: chid 2 mthd 0x0080 data 0x00000000
0x10005080 0x0000000d
[   57.731616] nouveau  [     DRM] EvoCh: chid 1 mthd 0x0080 data 0x00000000
0x10005080 0x0000000d
[   73.691785] nouveau  [     DRM] EvoCh: chid 1 mthd 0x0080 data 0x00000000
0x10005080 0x0000000d
[  118.486621] nouveau W[  PGRAPH][0000:01:00.0] disabled, PGRAPH=1 to enable
[  120.491687] nouveau  [     DRM] EvoCh: chid 1 mthd 0x0080 data 0x00000000
0x10005080 0x0000000d
[  127.921298] nouveau E[     DRM] evo 0 dma stalled

Are they any debugging kernel module parameters that can be enabled in order to
provide more information?

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