[Nouveau] [Bug 76732] Kworker using 100% CPU

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76732

--- Comment #11 from patrick.clara at gmail.com ---
Maybe now I can clarify a little bit.


If nouveau loads at boot, the problem is always there, even with
drm_kms_helper.poll=0.


If nouveau is blacklisted at boot i have two possible situations:
1)
- i have gdm on the screen
- through ssh load drm_kms_helper with poll=0
- load nouveau
- the screen goes black, or sometimes it displays some rubbish
- in dmesg whis appears:
[   66.938644] pci_pm_runtime_suspend(): nouveau_pmops_runtime_suspend+0x0/0xd0
[nouveau] returns -22
- i press ctrl+alt+F1 and nothing happens but this appears in dmesg:
[  175.868791] detected fb_set_par error, error code: -22
-> CPU load is normal

2)
- switch to tty1
- through ssh load drm_kms_helper with poll=0
- load nouveau
- screen changes resolution and still works, also changing tty works
- CPU load at 100%


All the 3 situations are reproducible all the time

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