[Nouveau] [Bug 66022] pwm1[_enable] faults after hibernate/restore related to automatic (or otherwise) fan management

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=66022

--- Comment #5 from Mr-4 <mr.dash.four at googlemail.com> ---
Some more feedback on this, after I was able to test this more thoroughly:

The automatic thermal management seems, at least for my card (Chipset G71 -
NV49), completely buggy!

After hibernate/resume, when my machine doesn't lock up a few seconds after
restore is complete (see Comment #4), I also get the following possible
scenarios developing:

pwm1=0
pwm1_enable=2
pwm1_max=100
pwm1_min=0
temp1_auto_point1_pwm=100
temp1_auto_point1_temp=90000
temp1_auto_point1_temp_hyst=3000
temp1_crit=115000
temp1_crit_hyst=2000
temp1_emergency=135000
temp1_emergency_hyst=5000
temp1_input=28000
temp1_max=95000
temp1_max_hyst=3000
update_rate=1000

[...]

pwm1=0
pwm1_enable=2
pwm1_max=100
pwm1_min=0
temp1_auto_point1_pwm=100
temp1_auto_point1_temp=90000
temp1_auto_point1_temp_hyst=3000
temp1_crit=115000
temp1_crit_hyst=2000
temp1_emergency=135000
temp1_emergency_hyst=5000
temp1_input=52000
temp1_max=95000
temp1_max_hyst=3000
update_rate=1000

As evident, pwm1_enable is restored, but the nouveau driver doesn't seem to
bother with any sort of fan management at all (the pwm1 is reduced from 100 to
0 after restore and it stays there for ever!).

When I do this:

echo 2 > /sys/class/hwmon/hwmon0/pwm1_enable 

I still get:

pwm1=0
pwm1_enable=2
pwm1_max=100
pwm1_min=0
temp1_auto_point1_pwm=100
temp1_auto_point1_temp=90000
temp1_auto_point1_temp_hyst=3000
temp1_crit=115000
temp1_crit_hyst=2000
temp1_emergency=135000
temp1_emergency_hyst=5000
temp1_input=55000
temp1_max=95000
temp1_max_hyst=3000
update_rate=1000

Next, I tried the following sequence:

echo 1 > /sys/class/hwmon/hwmon0/pwm1_enable 
echo 2 > /sys/class/hwmon/hwmon0/pwm1_enable 

pwm1=26
pwm1_enable=2
pwm1_max=100
pwm1_min=0
temp1_auto_point1_pwm=100
temp1_auto_point1_temp=90000
temp1_auto_point1_temp_hyst=3000
temp1_crit=115000
temp1_crit_hyst=2000
temp1_emergency=135000
temp1_emergency_hyst=5000
temp1_input=53000
temp1_max=95000
temp1_max_hyst=3000
update_rate=1000

[...]

pwm1=26
pwm1_enable=2
pwm1_max=100
pwm1_min=0
temp1_auto_point1_pwm=100
temp1_auto_point1_temp=90000
temp1_auto_point1_temp_hyst=3000
temp1_crit=115000
temp1_crit_hyst=2000
temp1_emergency=135000
temp1_emergency_hyst=5000
temp1_input=47000
temp1_max=95000
temp1_max_hyst=3000
update_rate=1000

As evident, the pwm1 "twitched" for a bit, and then "froze" at 26%, reducing
the card temperature from about 55 degrees to 47. I then did this:

echo 1 > /sys/class/hwmon/hwmon0/pwm1_enable 
echo 100 > /sys/class/hwmon/hwmon0/pwm1 
echo 2 > /sys/class/hwmon/hwmon0/pwm1_enable 

pwm1=88
pwm1_enable=2
pwm1_max=100
pwm1_min=0
temp1_auto_point1_pwm=100
temp1_auto_point1_temp=90000
temp1_auto_point1_temp_hyst=3000
temp1_crit=115000
temp1_crit_hyst=2000
temp1_emergency=135000
temp1_emergency_hyst=5000
temp1_input=44000
temp1_max=95000
temp1_max_hyst=3000
update_rate=1000

[...]

pwm1=13
pwm1_enable=2
pwm1_max=100
pwm1_min=0
temp1_auto_point1_pwm=100
temp1_auto_point1_temp=90000
temp1_auto_point1_temp_hyst=3000
temp1_crit=115000
temp1_crit_hyst=2000
temp1_emergency=135000
temp1_emergency_hyst=5000
temp1_input=47000
temp1_max=95000
temp1_max_hyst=3000
update_rate=1000

pwm1=13
pwm1_enable=2
pwm1_max=100
pwm1_min=0
temp1_auto_point1_pwm=100
temp1_auto_point1_temp=90000
temp1_auto_point1_temp_hyst=3000
temp1_crit=115000
temp1_crit_hyst=2000
temp1_emergency=135000
temp1_emergency_hyst=5000
temp1_input=58000
temp1_max=95000
temp1_max_hyst=3000
update_rate=1000

Again, pwm1 "froze" at a value of 13 and stayed there. Since I do not want to
burn my card out, I then switched to manual and set the pwm1 value to 100.

There are 3 additional bugs I discovered also, but will submit a separate
reports (and patches) for these.

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