ACPI related process hangs on T42p

[YONETANI Tomokazu]

Hi.

On Sat, Jul 03, 2004 at 04:08:01PM +0000, Johannes Hofmann wrote:
> on my Thinkpad T42p processes start to hang after the system has been
> running for a while, when ACPI is enabled.
> Then one process after another hangs, but the system remains responsive (at
> least for a while) and I can switch to the kernel debugger.

Just before you noticed that the processes started to hang, did you
do something special? closing lids, pressing special key combos, or
just kept it running without touching anything?

> So far all process were hanging in state biord and could not be killed
> anymore.
> Any ideas, how to track this down?

There's a kernel environment variable called debug.acpi.disabled, to
disable ACPI features. This helps narrowing down which part of ACPI code
is causing trouble. You can specify one or more of the following keywords,
separated by spaces.
   acad bus button children cmbat cpu ec
   isa lid pci pci_link sysresource thermal timer

"acpi" disables everything
"bus" disables "children"
"pci" disables "pci_link"

pci-related code in the acpi code in our tree is said to be incorrect,
so you may want to try disabling it first. There's also been a report
of lock-up which was worked around by disabling thermal code, but I'm
not sure whether it applies to your T42p.