I want to add
i915.i915_enable_rc6=1 as a kernel line as described here but I'm unsure where/how exactly.
If you've updated to grub2, edit /etc/default/grub
Then update the grub.cfg file, typically
Determine your grub version and check the Arch Wiki for additional details. Many users, myself included, switch to Arch because of their excellent documentation.
Based on this site you should add the line to the
According to the arch-linux forum it can also be done in