Red Hat Bugzilla – Bug 471181
After suspend/resume, processor spends more time in C0 state, C3 hardly used.
Last modified: 2010-06-28 06:48:36 EDT
Created attachment 323309 [details]
dmesg from session
Description of problem:
Before suspend, CPU time is well-portioned between mostly C0 and C3. After resume, according to powertop, the processor spends comparatively much more time in C0 (hardly ever in the low-power states). Wakeups due to ACPI interrupts also seem to be up threefold afterwards. This all results in rise in CPU idle temperature.
Version-Release number of selected component (if applicable):
kernel-22.214.171.124-32.fc9.x86_64 (and a few earlier ones).
Steps to Reproduce:
1. Suspend and resume.
3 times as many ACPI interrupts, hotter idle temperature.
Same as before suspend/resume.
For info on the hardware, see attachments to bug 448150.
Still seems to be in kernel-126.96.36.199-53.fc9.x86_64.
Also present in kernel 2.6.29-0.43.rc6.fc10.x86_64. Before a suspend/resume cycle, with an idle desktop, powertop reports the processor switching between C0 and C3 states, with respective residencies 3% and 97%. After suspending and resuming, it doesn't use C3 as much but uses C2, with residencies of around 55%, 43% and 2% for C0, C2 and C3, respectively. The ACPI interrupts have have been a red herring, but there appear to be more rescheduling interrupts after resume.
Reported upstream, cause is ~40kwups of unknown origin.
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