[Debian-eeepc-devel] Fancontrol and EEEPC

Hans-J. Ullrich hans.ullrich at loop.de
Thu Nov 17 19:21:17 UTC 2011


Dear developers,

I am a little bit confused, how the fan is controlled on an EEEPC 1005HA 
(which is the same as EEEPC 1005 HGO).

There are two ways I found out.

1. Choice:
- Starting grub with the option acpi_osi="Linux"
- kernel-module "eeepc_laptop" is loaded
- process "fancontrol" is started and reading /etc/fancontrol
- executing "pwmconfig" is working
- when the cpu is cold enough (below 45 degrees Celsius ), the fan stops

2. Choice
- Starting grub WITHOUT the option acpi_osi="Linux"
- kernel-module "eeepc_wmi" is loaded
- process "fancontrol" is NOT starting
- executing "pwmconfig" is NOT working and telling "no PWM hardware existent"
- when the cpu is cold enough (below 45 degrees Celsius), the fan NEVER stops
- the fan is always running, but with low rpm, and higher rpm are very, very 
seldom

Does "eeepc_wmi" inhibit the process "fancontrol"? What is the recommended 
choice for this special hardware? I read about two different, which are 
different controlled, but I do not really know, what my ABI my hardware owns. 

If I understood it correctly, the option "acpi_osi="Linux" is activating the 
oder ABI, and leaving it, will force the newer one. Sorry, if I sound dump, 
but I did not quite understand it, so I will be happy, if someone could 
enlighten me, how these things are working. 

Thank you very much for any answers!

Best regards 

Hans



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