Created attachment 69956 [details] Xorg log with KMS enabled I am having a problem with video playback on Ubuntu 12.04. When I try to play a video with resolution 640x480 (or similar) it either hangs or flickers like hell (depends on the player I use, VLC hangs). All players are using the Xvideo extension for output by default, but this seems to have a problem. The playback gets better when I configure the players to use x11 output instead (some frames are dropped though, because I have a slow CPU). But if I boot with "nomodeset", which disables KMS, I can use the Xvideo output, the playback works smoothly then. So I assume there is a bug somewhere in the combination of Xvideo + KMS + radeon driver (at least for my hardware).
Created attachment 69957 [details] output of xvinfo command
Please attach your dmesg output.
Created attachment 70022 [details] output of dmesg (KMS enabled) Here is the dmesg output
-- GitLab Migration Automatic Message -- This bug has been migrated to freedesktop.org's GitLab instance and has been closed from further activity. You can subscribe and participate further through the new bug through this link to our GitLab instance: https://gitlab.freedesktop.org/xorg/driver/xf86-video-ati/issues/50.
Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.