[lm-sensors] Kernel fault from ACPI when using W83627EHG on 2.6.15
roger at planbit.co.uk
Fri Apr 21 01:53:58 CEST 2006
I have just been setting up a new system using the Abit LG81 motherboard.
This is a fairly recent mobo with the Intel ICH7 chipset and the w83627ehg
sensor chip (...no uGuru, thank goodness...)
I got everything installed OK using a Debian ISO image I downloaded from the
web which is based around what I believe to be the stock 2.6.15 kernel.
The w83627ehf module was not loaded by default, so I modprobe'd the
"w83627ehf" module and it went in without error. I installed "lm-sensors"
from the Debian packages (v2.9.1). When I ran "sensors", I got back the
correct speeds for the 3 fans fitted and the system temperatures.
Everything matched the BIOS.
When I ran "sensors -s", however, I immediately got a kernel dump. I
haven't managed to get a proper capture of this, but the errors at the top
When I checked the sensors configuration, I found that the high temperature
thresholds were just below what my board was reading (CPU is at about 50
degrees and the PWM at about 45 degrees - not too high, but above the
original thresholds). When I changed them to much higher values so that
they wouldn't trigger (high=95 deg, hyst=85 deg), the kernel dumps stopped.
I did a bit of a search through the lm-sensors mailing list archives and
found the suggestion to boot with "acpi=off", so I tried it.
Booting with "acpi=off", if I have temperature thresholds that are lower
than the sensors temperatures, and run "sensors -s", I get no kernel faults
but I do get a high-low beeping from the motherboard! When I change the
sensors.conf file to have higher temperature thresholds so that the alarms
don't trigger, then the beeping from the motherboard stops (and still no
Although booting with "acpi=off" is a workaround, I would _really_ like to
have ACPI running as it means that the power button on the front of the box
does a controlled shutdown (rather than a hard power-off) if pressed briefly
as well as a few other nice features.
I appreciate that this looks like an ACPI problem, but it seems to be
triggered by the over-temperature from the w83627ehf module, so I thought
that it would be best to check this out first. Googling for the problem
seems to suggest some kind of device conflict may be occurring, but this was
on a kernel mailing list thread dating back to the 188.8.131.52 kernel in 2004.
Can anyone offer any help on this...
- Has anyone seen anything similar?
- Does anyone have a solution that allows me to keep ACPI active?
All help on this is appreciated.
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