So for the non-KMS case (using the hal backend), we should add the brightness_in_hardware quirk. For the KMS case this is not a bug in g-p-m, but in XBACKLIGHT/i915.ko, as far as I can see.
So for the non-KMS case (using the hal backend), we should add the brightness_ in_hardware quirk. For the KMS case this is not a bug in g-p-m, but in XBACKLIGHT/i915.ko, as far as I can see.