[Bug 97228] Video acceleration *regression* for Radeon Xpress 200M (r300) in xorg-lts-xenial & xorg-lts-wily

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97228

Dennis Mayr <dennis.mayr.c at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|unspecified                 |7.7 (2012.06)

--- Comment #3 from Dennis Mayr <dennis.mayr.c at gmail.com> ---

I've just upgraded the kernel to 4.4.0-34 (lowlatency).

(I've also corrected the Xorg versions; as Ubuntu user, I've fallen into the
bad habit of naming the package versions by the distribution nickname. Sorry.) 

Video acceleration works just fine combined with the X server for radeon,
version 7.5, using the r300 driver and DRI2.

Problems begin when using X servers 7.6 and 7.7.

Tearing ensues, regardless of the presence of a xorg.conf config file to
enable/disable options to improve framerate. Enabling DRI3 only worsens the
performance regression, and accentuates tearing.

What I've identified is: both xorg versions support DRI3, and show a
performance regression even if only DRI2 is active. Xorg 7.5 works great for
the r300 driver on the Radeon Xpress 200M onboard chip.

Here are 2 videos: the first is using Xorg 7.5, YouTube fullscreen on Chromium.
The second video is the same, under 7.7 (same problem as 7.6).

7.5: https://youtu.be/Ykhp2L_pf7Y
7.7: https://youtu.be/p7FvXTzlIa0 (ditto for 7.6)

The regression is evident.

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