Public bug reported: On my Kubuntu 14.04 (Trusty) system with an Nvidia graphics card and version 331.20 of the binary driver, I began having a problem with very jerky/juddery graphics after updating from kde-workspace 4.11.4 to 4.11.5. (The rest of the system is on 4.12.) About every half-second or so, everything moving or animating on the screen jerks very noticeably. This occurs for both OpenGL things like glxgears and for 2D things like scrolling in Firefox.
Looking through the changelog for 4.11.5, it would seem that the issue probably would have been caused by this: https://git.reviewboard.kde.org/r/114162/. However, using the KWIN_USE_BUFFER_AGE=0 environment variable does not eliminate the jerkiness. It does, however, introduce tearing, unless I set "Tearing Prevention (VSync)" to "Full Scene Repaints." ** Affects: kde-workspace (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1267977 Title: Extreme jerkiness with kwin compositing on Nvidia binary driver after upgrading to 4.11.5. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/kde-workspace/+bug/1267977/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
