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

From: Jeffrey Merkey
Date: Sat Jun 12 2010 - 13:52:00 EST

Not Reliably Reproducable. Looks like a firmware/hardware problem
with an old laptop.


On Fri, Jun 11, 2010 at 3:19 PM, Jeffrey Merkey <jeffmerkey@xxxxxxxxx> wrote:
> 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.
> Jeff
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