Re: APM fix from -pre7 seems to break "Dell laptop support"

From: Alan Cox (alan@lxorguk.ukuu.org.uk)
Date: Sun Feb 10 2002 - 09:56:59 EST


> With CONFIG_I8K=y and Massimo Dal Zotto's i8k utilities, it's necessary
> for me to revert Stephen Rothwell's 2.4.17-APM.1 patch that went into
> 18-pre7. If I don't, CPU temperature readings jump around erratically
> and the fans come on at the wrong temperatures. I reported this to
> Stephen and on lkml at the time -pre7 came out, but the problem is
> still there in -pre9. If the patch offers real benefits to non-Dell
> folk I guess I can just continue reverting...

CONFIG_I8K gives you direct control of the hardware features on the machine
while APM itself is also responsible for managing them. That there is a food
fight as a result should not be a suprise.

What you may want to try is using a semaphore so you never issue an APM
and an I8K call/request at the same time
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