[Bug 112315] 5.3.11 regression: No RC6 on Kaby Lake

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=112315

--- Comment #5 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to Tomas Janousek from comment #4)
> Not sure I feel daring enough to try those patches. Am I supposed to be able
> to apply that to 5.3.11 or perhaps compile drm-tip + that as a module for
> 5.3?

It's based on our 5.5-tree at present, so, you would have to compile the whole
kernel (just use your distro /boot/config-`uname -r`), and it only attempts to
enter rc6 faster after activity:

https://cgit.freedesktop.org/~ickle/linux-2.6/log/?h=bug112315

There is still a dependency on the background worker to pick up the pieces if
userspace is completely idle, so we need to think of ways of running that more
often, cheaply -- kicking it off after a completion event? Maybe tie it into
only if rc6 is disabled.

Hmm, I wonder if we can use something like task_work so that we clean up after
userspace on a process switch.

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