Public bug reported:
After updating the Ubuntu HWE stack in 14.04 to Xenial (kernel 4.4 and
xserver-xorg-video-radeon-lts-xenial), system boots up fine and
responsively, but screen is laggy; there is a tremendous performance
regression in comparison to xorg-lts-vivid. Lots of video tearing that
did not occur when using xserver-xorg-video-radeon-lts-vivid.
System is an older Pentium laptop (Packard Bell EasyNote) with a Radeon Xpress
200M chip (r300 driver). Video acceleration was working with DRI2 under the
Vivid stack (kernel 3.19-64-lowlatency + xserver-xorg-video-radeon-lts-vivid).
I also tried upgrading to the Wily kernel (4.2.0-lowlatency), and video
acceleration works fine with the Vivid xorg.
I reported this in launchpad previously, and it was dismissed as "invalid"
since Wily is EOL.
The problem, however, persists in the Xenial stack, so I'm reporting it here.
Attached are the respective Xorg.0 logs.
** Affects: xorg-lts-transitional (Ubuntu)
Importance: Undecided
Status: New
** Tags: hw-specific radeon video xenial
** Attachment added: "Vivid Xorg log (working)"
https://bugs.launchpad.net/bugs/1610591/+attachment/4715694/+files/Xorg.0.log.vivid-working.txt
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https://bugs.launchpad.net/bugs/1610591
Title:
Video acceleration regression for Radeon Xpress 200M (r300) in xorg-
lts-xenial & xorg-lts-wily
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