i915.mitigations=off [1]
Buyer beware. The improvement in performance is somewhere near 30%. Turning off
mitigations has security risks [2].
[1]
https://www.phoronix.com/scan.php?page=news_item&px=Intel-i915-mitiga...
[1]
https://www.phoronix.com/scan.php?page=news_item&px=Intel-iGPU-Leak-D...