[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 #8 from H Buus <ubuntu at hbuus.com> ---
(In reply to Chris Wilson from comment #7)
> See https://patchwork.freedesktop.org/series/48379/

Many thanks for looking at this issue. I'm compiling with your patch now, but
I'm unsure whether I'm supposed to do something about comment #5:

"Put a WARN in i915_gem_object_attach_phys() to see how frequently that code is
being called. If it is being called, grab an xorg debug log (xf86-video-intel
compiled with --enable-debug=full) for the next question is why. If not, the
problem is nothing to do with the phys object."

My guess is comment #5 was your first thought to collect debugging info and
then you had a better idea, namely this patch. So, I am assuming I should not
put a WARN in i915_gem_object_attach_phys(). If you do want a WARN added to
i915_gem_object_attach_phys(), I would appreciate a patch, because I am
unfamiliar with kernel WARN macros and how to use them.

It wasn't clear to me, reading the commit msg for
6a2c4232ece145d8b5a8f95f767bd6d0d2d2f2bb, that it had anything to do with
cursors (and I assume we're talking mouse cursors). FWIW, the mythtv
frontend/player normally doesn't display a cursor, unless the mouse is moved.
The frontend does have an option to disable the mouse cursor entirely, which I
have not enabled. It also has options to change the output mode, refresh rate,
etc. based on the video being played, which I haven't enabled either. Those
options are intended to take advantage of a display's deinterlacing
capabilities (especially TVs), which I have never explored.

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