[Nouveau] [Bug 80901] [NVCF] PWM fan speed too high

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80901

--- Comment #43 from poma <pomidorabelisima at gmail.com> ---
(In reply to K.-P. Schrage from comment #42)
> (In reply to poma from comment #40)
> 
> > /etc/udev/rules.d/10-unladen-swallow.rules
> > ACTION=="add", ATTRS{vendor}=="0x1234", ATTRS{device}=="0xabcd",
> > RUN+="/bin/sh -c '/bin/echo 1 >
> > /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/hwmon/hwmon1/pwm1_enable'",
> > RUN+="/usr/local/bin/nvapoke e118 80000002"
> 
> Thanks, Poma, this rule (all in one line, with my appropriate device and
> vendor id's) seems to work correctly, but it only reduces fan speed for a
> second or so during the boot process, then speed is up again, and the value
> that nvapoke writes is overwritten (800000d8 instead of 80000002).
> Perhaps this rule comes up too early, but changing the prefix number from 10
> to e. g. 99 doesn't help.


Exactly, these are oneliners.

There is no the GPU fan here, so I tested the CPU fan, and this is how it
works:
/etc/udev/rules.d/10-cpu-fan-manual-mode.rules
RUN+="/bin/sh -c '/bin/echo 1 > /sys/devices/platform/it87.656/pwm1_enable'"

Therefore remove ACTION & ATTRS part, so it runs unconditionally.

Before you reboot, check with:
# udevadm trigger

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