Re: Battery display generates ACPI events (stops X from powering off display)

On Thu, Aug 02, 2007 at 08:12:20PM -0500, Bill WIlson wrote:

> > > > I noticed that when I enable battery display in Gkrellm, an ACPI
> > > > event is generated every time gkrellm checks the battery status.
> > > > I have acpid running, and the message logged by acpid is
> > > > something like
> > > > 
> > > >     acpid: group=processor, action=processor, device=CPU1, value=00000000, id=00000080
> > > > 
> > > > I only have one CPU on my system (CPU0).
> > > >
> > > > Of course, reading the battery status and CPU temperature
> > > > manually from the files /proc/acpi/battery/BAT0/* does not
> > > > generate this ACPI event.
> > > > 
> > > > Any idea why, and how I can stop this?
> > >
> > > I'm very sure this is not the normal behavior since I have the
> > > battery display enabled and I'm not experiencing this... I was
> > > using it with the kernels 2.6.18, 2.6.21 and right now with the
> > > 2.6.22 and don't have that kind of problems... Maybe something
> > > with your acpi?? Which is your notebook? What distro are you
> > > using?
> > 
> > Well, I've seen this behaviour with 2.6.19, and 2.6.21 (also 22). I
> > use Gentoo, and my laptop is a Linux Certified laptop (LC2200E).
> 
> The battery monitor might read an ac_adaptor state file (if available)
> in addition to BAT0 files, so try reading that also manually as a
> test. Run gkrellm -d 0x8000 and at the top of the output you can see
> all of the battery files gkrellm is reading.

Aha. So doing this showed that gkrellm reads

    /proc/acpi/ac_adapter/AC0/state

Now just cat'ing that file generates the above ACPI event and cause X to
wake my monitor up from sleep.

Any idea what I can do about this? This certainly looks like a bug to
me. But I'm not sure where to report it. Linux kernel?

Also, as a work-around, is there some quick hack I can do to gkrellm to
avoid it reading that file? I'm getting quite tired of my scripts that
kill gkrellm after 10 mins of inactivity...

:)

Thanks,

GI

-- 
'Code Orange' -- Eat dessert first.
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