Comment # 27 on bug 1103356 from Thomas Blume

Created attachment 781156 [details]
logs from debug kernel

Hi Takashi,

the tests with your debug kernel were a bit surprising.
In contrast to the unpatched kernel, the fan didn't start immediately after
loading the nouveau driver.
Even after logging into the Xserver it took a few minutes until the fan noise
started.

cat /sys/devices/pci0000\:00/0000\:00\:01.0/0000\:01\:00.0/hwmon/hwmon0/pwm1

showed zero, until the fan noise started.
Then it showed: 100

That is quite different from the behaviour of the kernel with the reverted
patch.
That one constantly shows 20.
So, it seems that for any reason the debug kernel cause a sudden jump of the
fan speed from 0 to 100.
The attached debug log contain a dmesg and the journal log from before the fan
noise started and after.