Apologies for targeting the initial report to acpi-support.

Further information:

This occurs on a fresh install using http://cdimage.ubuntu.com/xubuntu
/daily-live/20070923/gutsy-desktop-i386.iso. I reinstalled to minimize
upgrade errors. The kernel update afterwards produces the same oops (and
is what was used in the dmesg).

several of the /proc/acpi/ibm/ entries are missing which can cause monitoring 
applications to fail.
$ ls /proc/acpi/ibm/
driver  hotkey  light  video

I tried patching the ubuntu source with thinkpad_acpi 0.16 (patches
clean with offsets) but that still produces an oops.

I then tried vanilla 2.6.22.9 from kernel.org and patch with 0.16 and there is 
no oops and the missing entries are back.
$ ls /proc/acpi/ibm
beep  driver  fan  led  thermal  volume
brightness  ecdump  hotkey  light  video

In both cases .config was produced by copying
/boot/config-2.6.22-12-generic and then 'make oldconfig' to try and
eliminate configuration differences as a variable. I followed the
procedure in https://wiki.ubuntu.com/KernelCustomBuild.

** Attachment added: "dmesg from 2.6.22.9 with thinkpad_acpi 0.16 (no oops)"
   http://launchpadlibrarian.net/9541643/dmesg-2.6.22.9

-- 
[gutsy] thinkpad_acpi oops on thinkpad t22
https://bugs.launchpad.net/bugs/145857
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