[Nouveau] [Bug 71455] Thermal management in nouveau running hot 3.12.0+ kernel

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71455

--- Comment #2 from Bob Gleitsmann <rjgleits at bellsouth.net> ---
Here is an additional data point. The problematic kernel sets 0xb20010f0 to
0x83ff03ff. The driver reports that the PWM is 100%. In fact it is 100% off. As
can be expected, the temperature immediately begins repidly rising.
Interestingly, the card seems to self protect by turning the fan on when the
temperature gets above the "critical" temperature and restoring the default PWM
(fan off). I suppose that is what "auto" means. The value in 0xb200010f0 never
changes while the fan speed goes up and down. 
The blob sets the same mmio address to 0x81ff03ff and reports the fan to be
50%. I can't tell you if "100%" PWM is fan off on all NV cards. I'm sure you
already know anyway. The fan speeds up significantly if the PWM setting is
either 0x00007fff or 0x80007fff. 
I guess that's more than one data point. Other than that, I'm completely in the
dark. However, I think I will patch my kernel so that it sets the PWM to 50%
instead of 100%. 50% off is a lot better than 100% off.

Bob

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