Kernel Bug Tracker – Bug 12019
Major increase in the number of wakeups from C3
Last modified: 2008-11-17 15:39:35 UTC
Latest working kernel version: 22.214.171.124
Earliest failing kernel version: 2.6.28-rc3
Distribution: Debian Sid
Hardware Environment: Fujitsu-Siemens Lifebook E8110, Intel T2400, 1.5G RAM, GMA950, iwl3945
Software Environment: Gnome 2.22.3
The processor is woken up from C3 by "extra timer interrupt" around 100 times per second. In .27, under the same conditions, I am able to achieve approx 10 wakeups per second, therefore better C3 residency times.
The testing was done with the RF kill switch ON.
Steps to reproduce: run powertop, apply all hints.
Created attachment 18845 [details]
Created attachment 18846 [details]
Created attachment 18847 [details]
.28 loaded modules
Created attachment 18848 [details]
.27 powertop output, 20 seconds
Created attachment 18849 [details]
.28 powertop output, 20 seconds
Notify-Also : Venkatesh Pallipadi <email@example.com>
Notify-Also : Thomas Gleixner <firstname.lastname@example.org>
From the log in comment #28 it seems that the system is waken up from C3 by "extra timer interrupt" about 117 times. It seems that the above test is done under graphics mode. (In the 2.6.28-rc3 kernel there exists the following info. "hrtimer_wakeup").
Will you please do the above test under console mode and see whether the problem still exists? When doing test under console mode, please don't load i915 drm driver.
Duplicate of #11905 ? If so, then it should work on -rc5.
Created attachment 18899 [details]
-rc5 powertop output
Fixed in -rc5, as seen in the attachment from comment #10.