Re: double power button events on presario 900 - apparently a timing issue?

[Fedor Karpelevitch <fedor-ugkMPi23kyXAHCkTjeiZhQ@public.gmane.org>]

Fedor Karpelevitch wrote:
> Nate Lawson wrote:
> > On Wed, 24 Sep 2003, Fedor Karpelevitch wrote:
> > > as I previously mentioned I am seeing an annoying problem on my
> > > presario 900 - when power button (works as FF here) is pressed
> > > it generates two events every time. I was experimentin with
> > > debugging output and noticed an interesting thing - if I do
> > > echo 0xffffffff > /proc/acpi/debug_level
> > > to get verbose debug output the problem goes away - I only get
> > > one event every time button is pressed. Looks like the problem
> > > is caused by some kind timing issue which goes away when
> > > debugging slows it down. Does this sound like a reasonable
> > > guess? Would anyone suggest how this can be debugged further?
> >
> > It means you need to debounce the event.
>
> do you mean debouncing on the receiving end? or would that be some
> way to avoid that in the kernel code?
>
by the way, I found that it is sufficient to do

echo 0x0800000f > /proc/acpi/debug_level and problem disappears. That 
bit is ACPI_DB_INTERRUPTS which is only referenced it two places...

Fedor.


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