[Bug 1267977] [NEW] Extreme jerkiness with kwin compositing on Nvidia binary driver after upgrading to 4.11.5.

[Michael Marley]

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

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Title:
  Extreme jerkiness with kwin compositing on Nvidia binary driver after
  upgrading to 4.11.5.

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