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Hi, I have an hp elitebook 2560p.
When I'm on battery, by fan isn't on unless my cpu temp is over 50C. It turns on for a few seconds and becomes really loud, and then turns back off again. When I'm downloading a package or compiling code, my cpu temperature jumps to 68C and the fan becomes really loud, and a few seconds later, it drops back to 47C.
I'm trying to control my fan. I already tried lm_sensors. The only thing it detects is the thermal sensor, (I also tried appending "acpi_enforce_resources=lax" to command line).
pwmconfig tells me that there are no pwm-capable sensor modules installed.
I've been searching for a solution for quite a while now, I'm running out of things to try.
Can anyone please suggest something?
Thank you
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That sounds like normal fan operation to me: is there an option in BIOS which enables the fan to be on when running on battery?
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Fans in laptops are usually controlled by the "embedded controller" (one chip for thermal management, keyboard, legacy I/Os like COM, LPT, floppy and maybe some other stuff - analog of Super IO from the desktop world).
These ECs are notoriously undocumented and run firmware which can be tweaked beyond sanity by each individual laptop vendor so it's no wonder that lm_sensors doesn't know yours.
Some laptop vendors provide proprietary interfaces to communicate with ECs and corresponding drivers for Windows. Thinkpads are one example. If your fan can be adjusted from Windows, try some googling to see if there are equivalent Linux tools available.
If there are no such tools for Windows then making a Linux tool would lie somewhere on the hard-to-impossible spectrum.
Last edited by mich41 (2015-12-26 11:53:11)
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