[Bug 577702] Re: ACPI errors at boot (HP 8540w Elite Workstation)

[Pedro Bedolla]

I have a different experience with the kacpid bug also in a HP 8540w with BIOS ver. F.07. I've tested it in Ubuntu 10.04 with the default kernel and also against the main-line kernels 2.6.33.3-lucid, 2.6.33.4-lucid and 2.6.32-rc7. In all this cases kacpid is taking ~100% CPU (only 1 thread of 1 core). Setting the option "FAN always on while on AC power" in the BIOS didn't work for me.
I've noticed that unloading the xhci module with pm-utils before suspending also fixes the kacpid bug but only after resuming a suspended laptop.
This bug have been reported for the linux kernel version 2.6.34 RC6 (https://bugzilla.kernel.org/show_bug.cgi?id=15924), but here it is mentioned that this bug was not present in the kernel 2.6.33.3 On OSS 11.3 M3.

In Ubuntu 10.04 it is possible to temporary save the problem by disabling GPE01 with
echo disable > /sys/firmware/acpi/interrupts/gpe01


** Bug watch added: Linux Kernel Bug Tracker #15924
   http://bugzilla.kernel.org/show_bug.cgi?id=15924

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ACPI errors at boot (HP 8540w Elite Workstation)
https://bugs.launchpad.net/bugs/577702
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