https://bugzilla.novell.com/show_bug.cgi?id=717454
https://bugzilla.novell.com/show_bug.cgi?id=717454#c20
Richard Brown changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEEDINFO |NEW
InfoProvider|awafaa@opensuse.org |
--- Comment #20 from Richard Brown 2011-10-23 12:37:27 UTC ---
Hi Greg,
I've been doing some experiments with those i915 module params - all of the
below numbers are from Factory with kernel 3.1.0-rc9-1
X220 powertop recorded idle power consumption with full screen brightness, wifi
enabled and no i915 parameters
18-20W
General use (mouse movements, browser opening, etc) sees consumption spike upto
35W+
X220 powertop recorded idle power consumption with full screen brightness, wifi
enabled and i915.i915_enable_rc6=1
12.8-13.1W
General use (mouse movements, browser opening, etc) sees consumption spike upto
20W for brief periods
X220 powertop recorded idle power consumption with full screen brightness, wifi
enabled and i915.i915_enable_rc6=1 i915.powersave=1 i915.i915_enable_fbc=1
i915.lvds_downclock=1
12.5-13.0W
General use (mouse movements, browser opening, etc) sees consumption spike upto
16W for brief periods
So, I would say that the suggestion that i915_enable_rc6 is the key change that
dramatically improves battery life looks like, with some other parameters also
providing a small nudge with no side effects in my testing, yet.
Removing the NEEDINFO as hopefully this answers GregKH's inforequest, still
going to check out Bruno's idea though
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