Re: Linux 2.6.34 causes system lockup on Compaq Presario 2200 Laptop

From: Len Brown
Date: Fri Jun 11 2010 - 13:08:09 EST

On Fri, 11 Jun 2010, Jeffrey Merkey wrote:

> Len,
> I am having trouble getting a trace of this because its down hard to
> reproduce. The reason is the lockup happens before I log into the
> laptop. i.e. I boot 2.6.34 and if I let the laptop just sit there is
> happens. If I log in and start doing work on it, it does not seem to
> happen. It's related to using the laptop on battery mode with the
> charger removed. I have a 2U appliance setup I am working on today
> and this frees up the laptop to try to reproduce this. The flaky
> battery power misreporting was in fact accurate. The battery in that
> laptop is 6 years old and does have low power. I am certain the
> lockup if related though. I will try to reproduce today and setup the
> trace to run after boot. I have had it sitting there for an hour and
> it has not reoccurred. Let me try through today and if I cannot
> reproduce, close the bug.

Good to know, Jeff.

One possibility is that the old battery is confusing
the embedded controller -- possibly exposing a firmware bug.
The EC, in turn, is fully capable of hanging the OS.

If you *can* reproduce it, it may be interesting to bisect
recent changes to drivers/acpi/ec.c

Also, if you can reproduce it, it would be good to verify
that the problem occurs only when the battery driver is loaded.


> > Please attach the output of acpidump here:
> >
> >

We could still use this output -- note that you can
capture it at any time, independent of the failure,
and independent of the kernel -- as it is simply
a copy of the tables that the BIOS is exporting to Linux.

-Len Brown, Intel Open Source Technology Center
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at