[Bug 107600] Regression: stuttering H.264 video w/ mythtv on old laptop w/ 915GM igp

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107600

--- Comment #14 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to H Buus from comment #13)
> (In reply to Chris Wilson from comment #12)
> > It's API compatible with Xorg-1.6 through 1.19 (there's one tiny change
> > required for 1.20 and Prime offload :(, but not going to affect you.
> 
> So you'd prefer I compile from master, right? I'm experimenting with the
> source package at the moment, but I can switch to a git repo. The deb source
> did help installing required packages and giving me a starting point with
> configure.

Indeed deb-src will have given you all the builddeps you need, and I'd prefer
to go with master as quite likely we may be playing with a few patches there as
well.

Can you also grab x[11]trace and record the stutter in MythTV using that?
(xtrace -n -o stutter.txt mythtv...)

The second-to-last piece of the puzzle would be something like drm.debug=0x7 so
that we get all the ioctls being called, and the final would be an ftrace of
all the i915 tracepoints.

Sadly all of that will produce a lot of information, completely hiding the
stutter. I'm just hoping to hit upon an idea worth investigating (the
i915:i915_request_wait_begin tracepoint would be a good candidate).

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