I just installed Xubuntu Quantal into a laptop with a 2nd gen Sandy Bridge processor, Intel graphics. I was using the i915 lines in Grub but are they still necessary with the newer kernel? I don't notice any increase in heat or fan activity without them. In fact, 3.5 seems to run cooler than 3.2 did with Precise.
The Grub line I used was.
Code:GRUB_CMDLINE_LINUX_DEFAULT="pcie_aspm=force i915.i915_enable_rc6=1 i915.i915_enable_fbc=1 i915.lvds_downclock=1 i915.powersave=1"