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[Bug 717454] Power consumption of 3.0.4 kernel is 10-20W higher than 2.6.37 on new i7 based SandyBridge processors

Richard Brown <rdb@xxxxxxxxx> changed:

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InfoProvider|rdb@xxxxxxxxx |

--- Comment #9 from Richard Brown <rdb@xxxxxxxxx> 2011-09-17 09:51:18 UTC ---
On my X220 (Sandybridge CPU) with 2.6 (Stock oS 11.4 kernel) running powertop
in runlevel 1, I see power consumption as previously reported (11W) with the
CPU spending almost all of its time in C4 state (99-101% according to powertop)

Changing to kernel 3.0 (Tumbleweed version) running powertop in rl 1, power
consumption is as previously reported (17W).
powertop reports that the CPU is spending just as much of its time in C4 state

Looks like the power drain is coming from something other than the CPU, or
powertop is lying.

Will be doing these same tests on my Gulftown hardware later today when I'm
back at home

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