[Nouveau] [Bug 66177] pwm1 value not restored during hibernate/restore cycle in the event of manual fan management mode

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=66177

--- Comment #9 from Martin Peres <martin.peres at ensi-bourges.fr> ---
(In reply to comment #7)
> Sorry, one other thing I forgot to mention, which should be pretty obvious,
> given what I reported so far:
> 
> The "auto" fan management seems to work as expected when I do *not* use it
> after hibernate/restore.
> 
> In other words, when I boot up my machine (which, by default, has fan
> management disabled) and then select "auto" fan management with "echo 2 >
> ../pwm1_enable", then things are OK - the fan duty (pwm1) constantly hovers
> between 20 and 28, depending on my card temperature, keeping that
> temperature under control. No problems there.

That's what I tested and it indeed worked beautifully. But I only tested that
on my desktop PCs and I never suspend them. Silly me...

> 
> Things are then *really* screwed up when I do hibernate/restore as reported
> previously. So, I suspect the hibernate/restore does something to the
> nouveau driver which prevents the auto mode from working properly.

Again, what worries me the most is the fact that the fan stop being updated
randomly. That's a SERIOUS bug! For the sysfs bug, I'll try to come up with an
acceptable solution for both users and devs.

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