[Bug 13145] Processor does not go below C2 if mouse (uhci) is plugged in.

[bugzilla-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=13145


Venkatesh Pallipadi <venkatesh.pallip...@intel.com> changed:

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--- Comment #14 from Venkatesh Pallipadi <venkatesh.pallip...@intel.com>  
2009-04-23 23:31:17 ---

2.6.26 also detects the Bus Mastering activity and goes into C2 state instead
of C3. But, it reports the time as "C3 time". Thats the reason powertop shows
time spent in C3, even though in reality CPU is in C2.

This patch
"cpuidle: update the last_state acpi cpuidle reflecting actual state entered"

fixes the C-state reporting bug and now we correctly report the time being
spent in C2 and not C3. So, this is not a bug. This is rather a bug fix for
wrong C-state reporting in powertop in earlier kernels.

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