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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Regression: stuttering H.264 video w/ mythtv on old laptop w/ 915GM igp"
href="https://bugs.freedesktop.org/show_bug.cgi?id=107600#c14">Comment # 14</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Regression: stuttering H.264 video w/ mythtv on old laptop w/ 915GM igp"
href="https://bugs.freedesktop.org/show_bug.cgi?id=107600">bug 107600</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>(In reply to H Buus from <a href="show_bug.cgi?id=107600#c13">comment #13</a>)
<span class="quote">> (In reply to Chris Wilson from <a href="show_bug.cgi?id=107600#c12">comment #12</a>)
> > 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.</span >
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).</pre>
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