<html>
<head>
<base href="https://bugs.freedesktop.org/" />
</head>
<body>
<p>
<div>
<b><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - pwm1[_enable] faults after hibernate/restore related to automatic (or otherwise) fan management"
href="https://bugs.freedesktop.org/show_bug.cgi?id=66022#c5">Comment # 5</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - pwm1[_enable] faults after hibernate/restore related to automatic (or otherwise) fan management"
href="https://bugs.freedesktop.org/show_bug.cgi?id=66022">bug 66022</a>
from <span class="vcard"><a class="email" href="mailto:mr.dash.four@googlemail.com" title="Mr-4 <mr.dash.four@googlemail.com>"> <span class="fn">Mr-4</span></a>
</span></b>
<pre>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 <a href="show_bug.cgi?id=66022#c4">Comment #4</a>), 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.</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are the assignee for the bug.</li>
</ul>
</body>
</html>