Red Hat Bugzilla – Bug 53273
kapm-idled consumes an excessive amount of CPU time
Last modified: 2007-04-18 12:36:54 EDT
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Description of problem:
The kapm-idled process consumes an excessive amount of CPU time on my
IBM Thinkpad 770Z running RH7.1 Typically it is consuming ~75% of the CPU
leaving only 25% CPU for idle time.
The system is fairly sluggish when this process is consuming CPU time.
niced processes get almost no CPU time.
Because this is a kernel process, one cannot even kill it.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1.run top on an IBM Thinkpad 770Z
Actual Results: Process 3 is hugging ~75% of the CPU.
Expected Results: An idle system would have nearly 100% of the CPU
When I re-build the kernel with CONFIG_APM_CPU_IDLE not set, the
kapm-idled no longer became a CPU hog.
Is that a bug or a feature? If feature, it is certainly a mis-feature on
the IBM Thinkpad 770Z.
Changed the sevarity to Normal since there is a work-a-round to
compile a kernel without CONFIG_APM_CPU_IDLE.
It's a feature. kapm-idled is ALSO the idle task, but the one where your laptop
goes into powersave mode during idle.....
I agree it's a bit confusing to see it show up though.