I am experiencing this same thing, but without an apparent workaround. After upgrading from kernel 2.6.38 to 3.0.0-0300, I saw a DRAMATIC increase in power usage on my Sandy Bridge laptop. I then upgraded to 3.1 and saw no improvement. Trying kernel parameter i915.i915_enable_rc6=1 made no difference whatsoever for me.
I am on a ThinkPad X220 with an Intel(R) Core(TM) i7-2620M CPU @ 2.70GHz. I documented the symptoms of the problem at http://ubuntuforums.org/showthread.php?t=1822629 The bottom line of that thread is that powertop shows a HUGE number of wakeups from "[Rescheduling interrupts] <kernel IPI>" with the 3-series kernels and no such wakeups with older kernels. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/818830 Title: Sandy Bridge serious power regression from kernel 3.0.0-6 to 3.0.0-7 (30% more power at idle) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/818830/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
