[ltp] Not able to modify /proc/acpi/ibm/fan

cupaxe linux-thinkpad@linux-thinkpad.org
Tue, 1 Dec 2009 14:29:24 -0500

I would like to do the following two things:

- Keen my fan always running at the maximum speed.
- Keep my CPU running at the maximum speed.

Since I had problems with my LCD, I have connected my thinkpad to a
external display and am using it as a desktop. So fan noise, battery
conservation, etc are a non-issue.

I read in the thinkwiki documentation that

echo level 7 > /proc/acpi/ibm/fan

would make the fan rotate faster. The current output is:

# cat /proc/acpi/ibm/fan
status:		enabled
speed:		2606
level:		auto

But when I try to write to  /proc/acpi/ibm/fan, I get,

bash: echo: write error: Invalid argument

I tried my best searching for a way to modify /proc/acpi/ibm/fan but
wasn't able to get anywhere. So if this post has already been
answered, my sincerely apologies.