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

From: Jeffrey Merkey
Date: Fri Jun 11 2010 - 17:43:17 EST

On Fri, Jun 11, 2010 at 11:07 AM, Len Brown <lenb@xxxxxxxxxx> wrote:
> 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.
> thanks,
> -Len
>> > 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.
> thanks,
> -Len Brown, Intel Open Source Technology Center

I can tell you for certain it does only happen when the battery driver
is loaded. Still has not ocurred. Just rebooted it 15 minutes ago --
trying again.

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