*** This bug is a duplicate of bug 1610591 ***
https://bugs.launchpad.net/bugs/1610591
Because you had said it could be related to Mesa, so I asked again
referring to the Mesa package.
Close it if you want.
I guess I'll never ask for help anymore.
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https://bugs.launchpad.net/bugs/1646140
Title:
Radeon Xpress 200M - performance regression in video playback with
Wily stack (Vivid is last working stack)
Status in mesa package in Ubuntu:
New
Bug description:
After updating the Ubuntu HWE stack in 14.04 to Wily (kernel 4.2 and
xserver-xorg-video-radeon-lts-wily), system boots up fine, but screen
is laggy; although DRI3 is now enabled (according to Xorg.0.log), 2D
acceleration seems to be gone.
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'm using a 14.04 LTS-based distro, ElementaryOS, with vanilla Ubuntu HWE
stacks.
(Testing with Oibaf's PPA or Xorg-edgers repo did not solve the problem
either, so I purged the PPAs and reverted to official Ubuntu sources)
We already bisected and tested Xorg versions with the package
maintainers, and could not determine a consistent culprit, so the
suggestion is that perhaps a newer Mesa version after Vivid is
impairing video acceleration in 2D content display. Which Mesa package
could be showing a regression, I do not know how to assess, so I'm
eager for your input.
Here is the original report, with logs and bisect results:
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1598593
Tell me what else you need, I'll get it for you.
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