2.4.0 APM w/ Compaq 16xx laptop...

2.4.0 APM w/ Compaq 16xx laptop...

[Brian Macy]

Anyone get this working? If so please tell me the version of you APM utilities
and what Power Management options you have on in the kernel.

Ever since I started trying 2.3.x, as soon as the box gets a change in it's
power status (even just an update of the % battery) Linux locks solid. It's 100%
repeatable.

In particular this is a Compaq Presario 1670. If I remove APM from the kernel it
runs perfectly... but no APM on a laptop really sucks.

Brian Macy
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Re: 2.4.0 APM w/ Compaq 16xx laptop...

[Erik Mouw]

On Sun, Jan 07, 2001 at 07:57:42PM -0800, Brian Macy wrote:
> Anyone get this working? If so please tell me the version of you APM utilities
> and what Power Management options you have on in the kernel.
> 
> Ever since I started trying 2.3.x, as soon as the box gets a change in it's
> power status (even just an update of the % battery) Linux locks solid. It's 100%
> repeatable.

Sounds like the kernel is using ACPI reserved memory, so the first ACPI
event corrupts kernel memory and the kernel locks up.

I've seen similar problems with an IBM ThinkPad 600X, but it was fixed
somewhere in 2.4.0-pre12-test7. Try linux-2.4.0, if that doesn't work,
boot the kernel with "mem=1MB-less-than-the-machine-actually-has", so
for a 128MB machine, try "mem=127M".


Erik

-- 
J.A.K. (Erik) Mouw, Information and Communication Theory Group, Department
of Electrical Engineering, Faculty of Information Technology and Systems,
Delft University of Technology, PO BOX 5031,  2600 GA Delft, The Netherlands
Phone: +31-15-2783635  Fax: +31-15-2781843  Email: J.A.K.Mouw@its.tudelft.nl
WWW: http://www-ict.its.tudelft.nl/~erik/
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Re: 2.4.0 APM w/ Compaq 16xx laptop...

[Brian Macy]

Thanks for the suggestion. Actually got around to trying it... didn't work. But
the other thing is that the laptop doesn't support ACPI, just APM.

Brian Macy

Quoting Erik Mouw <J.A.K.Mouw@ITS.TUDelft.NL>:

> On Sun, Jan 07, 2001 at 07:57:42PM -0800, Brian Macy wrote:
> > Anyone get this working? If so please tell me the version of you APM
> utilities
> > and what Power Management options you have on in the kernel.
> >
> > Ever since I started trying 2.3.x, as soon as the box gets a change in
> it's
> > power status (even just an update of the % battery) Linux locks solid.
> It's 100%
> > repeatable.
>
> Sounds like the kernel is using ACPI reserved memory, so the first ACPI
> event corrupts kernel memory and the kernel locks up.
>
> I've seen similar problems with an IBM ThinkPad 600X, but it was fixed
> somewhere in 2.4.0-pre12-test7. Try linux-2.4.0, if that doesn't work,
> boot the kernel with "mem=1MB-less-than-the-machine-actually-has", so
> for a 128MB machine, try "mem=127M".
>
>
> Erik
>
> --
> J.A.K. (Erik) Mouw, Information and Communication Theory Group,
> Department
> of Electrical Engineering, Faculty of Information Technology and
> Systems,
> Delft University of Technology, PO BOX 5031,  2600 GA Delft, The
> Netherlands
> Phone: +31-15-2783635  Fax: +31-15-2781843  Email:
> J.A.K.Mouw@its.tudelft.nl
> WWW: http://www-ict.its.tudelft.nl/~erik/
>
>
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