Comment 9 for bug 818830

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 a 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, where it is in a bit better context.

In the context on THIS bug, I'd like to ask: Has anyone else experienced graphical glitches and/or freezes while using i915.i915_enable_rc6=1 with kernel 3.x?