OS 13.1 - Driver "nouveau" - Unable to command fan speed - Nvidia 6800 GS

English Hardware
1

Hello.
I try to control fan speed via nouveau driver.

find /sys -name pwm1_enable return :
/sys/devices/pci0000:00/0000:00:02.0/0000:01:00.0/hwmon/hwmon0/pwm1_enable


readlink /sys/devices/pci0000:00/0000:00:02.0/0000:01:00.0/driver return :
../../../../bus/pci/drivers/nouveau

Data from /sys/class/hwmon/hwmon0 show :

./name        : nouveau
./pwm1        : 100
./pwm1_enable    : 0
./pwm1_max    : 100
./pwm1_min    : 0
./uevent        :
./update_rate    : 1000

Following this paragraph “Fan Control” from https://wiki.archlinux.org/index.php/Nouveau I try to set pwm1_enable parameter to 1 (manual settings); and then set fan speed to 30% by issuing the following command :

echo 30 > /sys/class/hwmon/hwmon0/pwm1

but get the following error

bash: echo: write error: Operation not permitted

Any help is welcome.

2

since you did not provide the full line it is not possible to know if you did the command as user or root???

3

Those command really works for you?

4

Please always post complete: prompt, command, output, next prompt. I little larger move with the mouse and such much more information for those who try to help you.

5

Sorry yes I did ( by typing the command in konsole in super user mode)

linux-rgbr:~ # find /sys -name pwm1_enable
/sys/devices/pci0000:00/0000:00:02.0/0000:01:00.0/hwmon/hwmon0/pwm1_enable
linux-rgbr:~ # readlink /sys/devices/pci0000:00/0000:00:02.0/0000:01:00.0/driver
../../../../bus/pci/drivers/nouveau
linux-rgbr:~ # echo 30 > /sys/class/hwmon/hwmon0/pwm1
-bash: echo: write error: Operation not permitted
linux-rgbr:~ #
6

I don’t n know
.
But should : Following this paragraph “Fan Control” from Nouveau - ArchWiki

7

It might sound stupid. but the first thing I always do in such a case is checking the permissions:

ls -ls /sys/class/hwmon/hwmon0/pwm1
8

linux-rgbr:~ # ls -ls /sys/class/hwmon/hwmon0/pwm1
0 -rw-r–r-- 1 root root 4096 Oct 10 18:51 /sys/class/hwmon/hwmon0/pwm1
linux-rgbr:~ # ls -ls /sys/class/hwmon/hwmon0/pwm1_enable
0 -rw-r–r-- 1 root root 4096 Oct 10 18:14 /sys/class/hwmon/hwmon0/pwm1_enable
linux-rgbr:~ #

9

Looks as if root has w access, but I do not know what the 0 type is???

BTW, where are your CODE tags :wink:

10

Here is journalctl ( nouveau part only )
http://paste.opensuse.org/56660361

and Xorg.0.log
http://paste.opensuse.org/52529502

/etc/X11/xorg.conf.d is not in use for graphic conf.
/etc/X11/xorg.conf : http://paste.opensuse.org/26692869

If that could help.

11

I am surprised that it is possible on ArchLinux and not on opensuse.
Any help is welcome

12

run “uname -r” on your Arch install, then read the kernel commits that occurred, for the nouveau DRM, between the 3.11 openSUSE kernel and that arch kernel you’re running, and i imagine you’ll find the answer :wink:

13

I am not running Arch linux. As said in the title, I am running opensuse 13.1.

So my question is still : Why I am unable to command fan speed with opensuse “nouveau” driver.

By the way :

uname -r
3.11.10-21-desktop

and

rpm -qa | grep nouveau
libdrm_nouveau2-32bit-2.4.46-3.2.2.x86_64
libdrm_nouveau2-2.4.46-3.2.2.x86_64
xorg-x11-driver-video-nouveau-1.0.9-3.1.2.x86_64