https://bugzilla.kernel.org/show_bug.cgi?id=20232
Summary: kworker consumes ~100% CPU on HP Elitebook 8540w
running 2.6.36_rc6-git4
Product: ACPI
Version: 2.5
Kernel Version: 2.6.36_rc6-git4
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Config-Interrupts
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected]
Regression: Yes
I'm having a serious CPU hogging problem with an HP Elitebook 8540w running
2.6.36_rc6. A kworker consumes ~100% CPU during all the uptime since booting.
I first tried rmmod'ing all the modules but it didn't help. Then I built the
kernel with some ACPI/PM verbose flags turned on and found out that an infinite
number of the following message was written in kernel log:
scsi host1: __pm_runtime_resume() returns 1!
I then passed "on\n" to all power/control files in sysfs but the messages
didn't
disappear. I disabled PM_RUNTIME to see if it was causing the kworker stuff,
but
nope, it still continues.
Then I found a similar report and tried writing "disable" to
/sys/firmware/acpi/interrupts/gpe01 and it stopped the kworker CPU consumation
problem *although the load average doesn't drop under ~1.3*. When enabled the
number of interrupts in /sys/firmware/acpi/interrupts/gpe01 increases very
fast.
The problem is not fixed with the pcie_pme=off trick suggested in the other bug
report related to this laptop.
(CC'ing İbrahim, the owner of the laptop)
Thanks
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