I have the same problem running feisty x86_64 on a Mac Pro. 2.6.20-13.21
fails with a similar dmesg log.
When I boot this kernel and run gnome, I get "Failed to initialize HAL".
Networking fails, and Suspend and Hibernate are unavailable from the
Quit dialog.
Blacklisting sbs fixes the HAL, network and Suspend/Hibernate problems,
but the kernel oops is still in the dmesg log (attached).
When sbs is blacklisted, running 'strace modprobe sbs' freezes at
"read(4, "8448 1 asus_acpi, Live 0xfffffff"..., 1024) = 1024 \n
nanosleep({0, 100000000}'
None of these problems occur with 2.6.20-12.20.
** Attachment added: "dmesg output, kernel 2.6.20-13.21, sbs blacklisted"
http://librarian.launchpad.net/7044399/dmesg
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Kernel 2.6.20-13 acpi bug
https://launchpad.net/bugs/96480
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