On Wed, Mar 26, 2014 at 10:17:51PM +0100, Daniel Vetter wrote:
> Note that the sleep(5); to fully idle the gpu is _really_ important.
> Without it the bug is not exhibited.
>
> The issue at hand is that after gem_quiescent_gpu we are at max
> (expected, since the blocking waits peg to max), but then we never go
> down to a lower freq again until we're fully idle. The tiny load is
> sufficient to keep the gpu at max. I've played around with this a bit
> and even ridiculously low loads (like one MI_STORE per 50ms) are
> enough to keep the gpu at max freq.
commit 2754436913b94626a5414d82f0996489628c513d
Author: Deepak S <deepak.s@xxxxxxxxx>
Date: Mon Jan 27 21:35:05 2014 +0530
drm/i915: Disable/Enable PM Intrrupts based on the current freq.
as expected is complete and utter codswallop.
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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