Regression from 0.8.6 to 0.9.2: Wakes up CPU at 60 Hz
Bug #681696 reported by
Tobias Wolf
This bug affects 12 people
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
compiz (Ubuntu) |
Fix Released
|
Medium
|
Unassigned |
Bug Description
Binary package hint: compiz
It used to be possible to configure Compiz to not generate interrupts at 60Hz to save some battery.
I’m not sure what’s going on nowadays with things like .drirc and buffer swaps and so on.
The thing is in 0.8.6 Compiz didn’t feature prominently in Powertop when »Sync to VBlank« was disabled (and neither did i915), it had less than 5 wakeups per second and i915 almost none. Now in natty it has 60-70 wakeups, the most CPU waking process. I could figure out how to get rid of these.
Top causes for wakeups:
26.1% ( 70.0) compiz
24.5% ( 65.7) [i915] <interrupt>
17.1% ( 46.0) [extra timer interrupt]
8.4% ( 22.7) [iwlagn] <interrupt>
Changed in compiz (Ubuntu): | |
importance: | Undecided → Medium |
status: | New → Confirmed |
tags: | added: natty regression-release |
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Committed a fix to git yesterday to use our own custom timers to avoid damage issues when doing smart repaint timeouts. I now get 0.7 wakeups with no screen activity.