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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #46 from K.-P. Schrage <kpschrage at gmx.de> ---
(In reply to poma from comment #45)

> And try this:
> /etc/systemd/system/gpu-fan.service 
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> [Unit]
> Description=GPU fan lower speed
> 
> [Service]
> Type=oneshot
> ExecStart=/bin/sh -c '/bin/echo 1 >
> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/hwmon/hwmon1/pwm1_enable'
> ExecStart=/usr/local/bin/nvapoke e118 80000002
> StandardOutput=null
> StandardError=null
> 
> [Install]
> WantedBy=basic.target
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> # systemctl enable gpu-fan.service
> # systemctl start gpu-fan.service
> # systemctl status gpu-fan.service
> 
> If everything is OK:
> # systemctl reboot
> ...
> 
> BOOT
> ...
> # systemctl status gpu-fan.service

After reboot:
[root at linux_keller kp]# systemctl status gpu-fan.service
● gpu-fan.service - GPU fan lower speed
   Loaded: loaded (/etc/systemd/system/gpu-fan.service; enabled)
   Active: inactive (dead) since Sa 2015-03-14 11:40:03 CET; 33s ago
  Process: 683 ExecStart=/usr/local/bin/nvapoke e118 80000002 (code=exited,
status=0/SUCCESS)
  Process: 672 ExecStart=/bin/sh -c /bin/echo 1 >
/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/hwmon/hwmon1/pwm1_enable
(code=exited, status=0/SUCCESS)
 Main PID: 683 (code=exited, status=0/SUCCESS)

Mär 14 11:40:03 linux_keller systemd[1]: Starting GPU fan lower speed...
Mär 14 11:40:03 linux_keller systemd[1]: Started GPU fan lower speed.
---------------
BUT: Fan speed is high, register e118 shows value 000000d8, not 00000002, as
expected. I have to restart the service manually to calm down the fan.

Let me be honest, poma: I am very grateful for all your help, but I think I'll
stick to the old-school method rc.local which seems to be rather
straightforward to me (although even that is now governed by systemd and not so
old-school anymore).

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