[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 #10 from H Buus <ubuntu at hbuus.com> ---
I'm afraid https://patchwork.freedesktop.org/series/48379/ did not help.

I first tested without drm.debug set. FWIW, I noticed the cursor is briefly
displayed when playback starts and stops, but definitely not when I see the
stuttering.

I experimented with turning on mythtv's "hide cursor" option. Didn't help, I
still see stuttering. So I rebooted with debug enabled and log_buf_len=512K.
The output is in dmesg4.txt

I started playback after about 120 seconds from boot time, with "hide cursor"
disabled. Same stuttering. Stopped playback.

Some time after 190 seconds, I turned on the "hide cursor" option and even
unplugged the USB optical mouse I use when doing maintenance (never been fond
of touchpads). Then started playback. I still see stuttering.

You mentioned looking at the ddx debug log. Is that the same as the "xorg debug
log (xf86-video-intel compiled with --enable-debug=full)" mentioned in comment
#5? If so, would it be sufficient to download and compile the deb-src package
that matches the binary version currently installed on the laptop? It is called
xserver-xorg-video-intel and is at version 2:2.99.917+git20171229-1. That
version contains the most recent tag albeit from 4 years ago, and apparently
has some patches from last December. Guess I'm worried compiling from master
could introduce ABI incompatibilities with other xorg packages.

Also, would I be correct in assuming the xorg/ddx debug log will go to
/var/log/Xorg.0.log?

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