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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #10 from patrick.clara at gmail.com ---
(In reply to comment #9)
> (In reply to comment #8)
> > Booting with drm_kms_helper.poll=0 does not help.
> 
> Are you absolutely sure? That should cause drm_helper_hpd_irq_event to not
> do any work and return immediately... unless that setting is somehow not
> getting propagated to dev->mode_config.poll_enabled...

I have tryed other 3 times and checked and rechecked spelling.
Nothing does change.

I then booted with "modprobe.blacklist=nouveau" and afterwards did "modprobe
drm_kms_helper poll=0" and "modprobe nouveau". The problem disappears but also
the output on the screen. I can not reproduce it every time and it could be
related to when and how i switch between tty. I got this in dmesg (only in this
particular case), dont know if it is related.

[   49.265515] [drm] Initialized nouveau 1.1.1 20120801 for 0000:01:00.0 on
minor 0
[   54.910045] pci_pm_runtime_suspend(): nouveau_pmops_runtime_suspend+0x0/0xd0
[nouveau] returns -22
[   78.572068] detected fb_set_par error, error code: -22
[  175.690629] detected fb_set_par error, error code: -22
[  176.447496] systemd-logind[2892]: New session 3 of user Debian-gdm.
[  183.530486] detected fb_set_par error, error code: -22
[  183.537975] systemd-logind[2892]: Removed session 3.
[  184.246263] systemd-logind[2892]: New session 4 of user Debian-gdm.
[  201.221280] systemd-logind[2892]: Removed session 4.
[  201.224190] systemd-logind[2892]: Removed session 1.
[  201.709503] detected fb_set_par error, error code: -22

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