Red Hat Bugzilla – Bug 587224
i915 wakeup rate is unreasonably high.
Last modified: 2018-04-11 03:34:38 EDT
Created attachment 410090 [details]
A screenshot of 'powertop' showing high wakeup rates for 'i915'.
Description of problem: Powertop reveals that 'i915' produces 60 wakeups per second even when the computer is perfectly idle (see attachment).
Previously, the wakeup rate would be around 4 or 5 wakeups per second (cumulatively for all processes).
The battery life is greatly influenced by this -- it uses around 1.2W more (8.7W instead of 7.5W in a previous version of the kernel).
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. update kernel to 126.96.36.199-99.fc12.i686.PAE and boot into it
2. observe higher wakeup rate.
Actual results: Higher wakeup rate, more consumed power -- observed with powertop.
Expected results: Same (or lower) wakeup rate, same (or lower) power consumption.
Additional info: see attachments.
Created attachment 410091 [details]
Output of 'dmesg'
Created attachment 410092 [details]
Detailed hardware information for the machine on which this bug was first discovered.
I've observed the power consumption again. I actually see that when idle the power consumption is 9.1W. Previously it was 7.5W (with exactly the same conditions).
Created attachment 410345 [details]
Wakeup situation for an older kernel (188.8.131.52-70.fc12.i686.PAE).
Notice that the wakeup count and power consumption are lower.
The problem still exists with the 184.108.40.206-127.fc12.i686.PAE kernel.
Still the same with 220.127.116.11-150.fc12.i686.PAE.
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This problem does not exist in Fedora 14 (18.104.22.168-48.fc14.i686).