I made a mistake previously and would like to clear it up. The mistake was a result of not giving something enough time and testing. I have now tested it more thoroughly and have more to report:
Using the modified (no sparse irq) kernel with kernel parameter i915.i915_enable_rc6=1 DOES increase battery life compared to without that kernel parameter. The only problem is that it also brings back the graphical glitches and freezes, which were the ONLY reason I wanted to switch to kernel 3.x in the first place. Thus, that kernel parameter in concert with disabling sparse irq in the kernel solves the power problem (completely or almost completely), but the i915.i915_enable_rc6=1 kernel parameter brings back the glitchy graphics from kernel 2.6.x. I have also added this comment to the ubuntuforums thread. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/834037 Title: Huge power regression in kernel 3.x on Sandy Bridge laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/834037/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
