I've just upgraded the kernel to 4.4.0-34-lowlatency by installing the linux-image-lowlatency-lts-xenial package. Video acceleration works just fine combined with the xserver-xorg-video-radeon-lts-vivid (DRI2).
Problems begin when using xserver-xorg-video-radeon-lts-wily or xserver- xorg-video-radeon-lts-xenial. 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. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg-lts-transitional in Ubuntu. https://bugs.launchpad.net/bugs/1610591 Title: Video acceleration regression for Radeon Xpress 200M (r300) in xorg- lts-xenial & xorg-lts-wily Status in xorg-lts-transitional package in Ubuntu: New Bug description: 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-lts-transitional/+bug/1610591/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
