Markus Brueffer wrote:
Nate Lawson schrieb:
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.
That's why I didn't add support for it in the first place. The problem
is that especially with the T43 series there seems to be a fan problem.
If it reaches a certain threshold the fan is switched on, but never
switched off regardless how cool the notebook gets.
That's probably a bug in acpi_thermal. It needs a thorough debugging
anyway.
If the new documentation in acpi_ibm(4) isn't enough, I can add bigger
warning signs:
dev.acpi_ibm.0.fan
Indicates whether the fan is in automatic (1) or manual (0) mode.
Default is automatic mode. This sysctl should be used with
extreme precaution, since disabling automatic fan control might
overheat the ThinkPad and lead to permanent damage if the
For obvious reasons I haven't tested if the BIOS overrides the user
settings if the temp gets too high :)
That seems good. I didn't see the man page update before I replied.
--
Nate
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