cvs commit: src/sys/dev/acpi_support acpi_ibm.c

[Nate Lawson]

Markus Brueffer wrote:
> markus      2006-01-14 00:39:10 UTC
> 
>   FreeBSD src repository (ports committer)
> 
>   Modified files:
>     sys/dev/acpi_support acpi_ibm.c 
>   Log:
>   - Add support for setting the fan control mode to manual or automatic
>   - Add support for adjusting the fan speed if the fan control mode is manual
>   
>   Documentation for the relevant embedded controller register was obtained from
>   http://www.thinkwiki.org/wiki/Patch_for_controlling_fan_speed
>   
>   Tested on:      R51  by Fabian Keil
>                   T41p by markus
>   Requested by:   many
>   Approved by:    philip
>   MFC after:      1 week
>   
>   Revision  Changes    Path
>   1.10      +55 -3     src/sys/dev/acpi_support/acpi_ibm.c

Thanks for adding support for this but it should be noted that this can 
be very dangerous.  If your userland app tries to control the fanspeed 
and dies, your system could overheat.  Hopefully, the BIOS will override 
the user settings if the temp gets too high but that is a longshot when 
mucking with things at this low level.

-- 
Nate