View Full Version : CPU fan not working after booting
27th July 2004, 07:57 AM
i've installed fedora 2 on a compaq n600c laptop and am having probelms with over heating....
As FC2 initally boot the CPU fan works fine, at the screen where you choose the kernel, it still working. After the kernel is selected and FC2 wtarts to boot the fan stops never to restart,,,,
At tmes the machine has turned itself of due to getting too hot...
I've tried several things, however am a bit of a linux newbie.... I've changed to grub boot line to iclude the acpi=on but nothing appears to work....
I'm seeing that lots of other people are also seeing similar issues with the fan.... Has anyone managed to fix it ??
27th July 2004, 08:04 AM
I don't know what the problem is, maybe this will help:http://www.fedoraforum.org/forum/showthread.php?t=18469&highlight=overheating
27th July 2004, 08:12 AM
yeah, i saw this.... however i'm still not understanding what i need to do to fix this... The laptop is really getting hot, too hot to touch at times.....
can't be good for it....
27th July 2004, 08:24 AM
This one too?? http://www.fedoraforum.org/forum/showthread.php?t=18079&highlight=fan+cpu+laptop
Does state the problem but no solution, I will keep searching!!!
28th July 2004, 09:02 AM
cheers Tash !!
well, i can now turn the fan on and save a critical melt down using :
'echo -n "on" > /proc/acpi/fan/FAN/state'
however i can't turn it off again !!!
28th July 2004, 10:24 AM
How can we have missed this thread???
Must be an answer in there somewhere! How about this one??
Hi, browse around /proc/acpi to find out if it is working correctly. If you have the relevant directories and you can generally find out the state of the fan, acpower or whatever then acpi is working correctly.
To correctly modify the cpu speed I believe that you need two things:
(1) the component cpu freq needs to be enabled in the kernel. I believe it is in the fedora default kernel. In any case you can check by doing this command as root (without the inverted commas): "grep -i cpu_freq /boot/config-2.6.5-1.358". Further, you have to check that the cpu_freq component supports your processor. It doesn't support mine (PII) for example. You can find this out in the attached file (the user guide to cpu_freq). If all is ok you should have a file in /sys/devices/system/cpu/cpu0/.
(2) You need a service which manages the cpu speed. I believe fedora provides one called cpuspeed. Make sure that this service is enabled and read the man file about how it works ;) If there is no man file then do a search on the internet.
Hope this helps.
p.s. you can stop the mdmpd service as it's not working ;)
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