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Subject: Re: Polling /proc/apm causes usb hiccups and clock drift
From: James D Strandboge <jstrand1@rochester.rr.com>
To: Philipp Matthias Hahn <pmhahn@titan.lahn.de>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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Date: 25 Sep 2002 08:39:04 -0400
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On Tue, 2002-09-24 at 12:22, Philipp Matthias Hahn wrote:
> Hi James!
> 
> On Tue, Sep 24, 2002 at 09:12:00AM -0400, James D Strandboge wrote:
> > Disabling the battstat-applet and not touching /proc/apm lets xawtv work
> > fine without the above errors.  Polling /proc/apm also causes clock
> > drift.
> > 
> > I have a Dell Inspiron 8200 laptop (1.6Ghz Pentium 4).  Using kernel
> > 2.4.18-686 from debian.  I read that this happened to people in the 2.2
> > series.  Is this a kernel apm bug or BIOS problem?  Do I just have to
> > live with it?
> 
> This is a known BIOS limitation. Interrupts are disabled during
> APM-BIOS calls and they may take a long time, during which the kernel
> might miss some clock interrupts.
> You can try to enable CONFIG_APM_ALLOW_INTS=y during kernel compile, but
> your BIOS might not like it.
> 
Thanks.  Yes I have this disabled because it has caused problems with
others using the inspiron 8200.  I will play with it though.  This most
definitely is a BIOS bug then, and I have to live with it.  Is ACPI any
better?

Jamie Strandboge

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