[Intel-gfx] RC6 support in Ironlake

[kitestramuort]

Hello,

I am suddenly stuck with an old laptop (Thinkpad X201) with gen5 intel
gfx. I remember using it back when rc6 was enabled in ironlake, and
working really well, so I am trying to patch a recent kernel to get rc6
back and get a bit more battery life. I understand that the last
patchset (
https://lists.freedesktop.org/archives/intel-gfx/2017-November/147557.html
) was never applied in full. I thought of trying it, but couldn't track
down what kernel the patches were meant for. Tried everything from 4.13
onwards, but patching fails every time.

Do people know what was the last kernel to have rc6 enabled for
ironlake or, alternatively, to what specific -rc or minor version
kernel I could apply the patches above?

Thanks very much