Video acceleration *regression* for Radeon Xpress 200M (r300) in xorg-lts-xenial & xorg-lts-wily
Submitted by Dennis Mayr
Assigned to xf86-video-ati maintainers
Description
Created attachment 125576
Xorg.0.log VIVID - working
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.
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.
I reported this in launchpad previously, and it was dismissed as "invalid" since Wily is EOL.
The problem persists in the Xenial stack, so I'm reporting it here.
Attached are the respective Xorg.0 logs.
Attachment 125576, "Xorg.0.log VIVID - working":
Xorg.0.log.vivid-working.txt