Re: HP Compaq nc6320 - Booting on battery power causes softlock

[Peter Clifton <pcjc2@cam.ac.uk>]

On Tue, 2007-01-16 at 22:15 -0500, Len Brown wrote:
> try also "apm=off" -- since the ACPI/APM dependency checking
> is currently broken in some configs.
> 
> On Tuesday 16 January 2007 22:04, Luming Yu wrote:
> > The first thing is to make sure you are running the latest bios, kernel.
> > Then, you need to sort out the kernel component/modules/drivers that
> > cause the problem.
> > If you guess it is ACPI issue, pleas test boot option acpi=off to see
> > if the problem goes away. If you guess it is battery issue, please
> > remove battery module, etc.
> > Please don't forget to enter a bug in bugzilla.kernel.org.
> > 
> > Thanks,
> > Luming

Ok, I've tested acpi=off and apm=off with the stock Ubuntu kernel. It
didn't softlock with either, but I'll try to use one of the two when
booting now to ensure it is consistent.

with acpi=off, there was a backtrace printed from an unloved IRQ11, and
the sound card wasn't particularly happy. These HP laptops seem very
picky - perhaps I should buy an IBM next time for linux!

I've filed a bug, #7840, http://bugzilla.kernel.org/show_bug.cgi?id=7840

It is under ACPI/Other. Attached to that bug is dmesg output from the
normal AC boot, and battery boots with acpi=off, api=off, also an
acpidump output from the normal AC boot.

I will check the bios, and vanilla kernel tests when I get chance.
Unfortunately, it seems quite hard to get a kernel config which exactly
matches a stock Ubuntu one (for keeping as few variables changed as
possible). I can recompile a kernel source deb for Ubuntu quite happily,
but it produces a huge number of versions, and takes many many hours
(brings me back to using linux on a [34]86 :))

Thanks for your input Luming, Len.

Regards,

Peter Clifton