[Bug 1069498]

[Andreas Hermann]

I applied this patch against kwin 4.10.1. My system has an nvidia card, using the binary blob.
My results:

- with 'c' mode:  zero tearing, but kwin constantly has 60% cpu usage.
Performance is ok, but i think this is because of the powerfull gpu/cpu
(gtx460 + core i7)

- with 'e' mode: amazing performance, but again tearing on the second
monitor (upper part)

- with 'p' Mode: same as c

However, tearing generally disappears if i force my two monitors to have
the same resolution.

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https://bugs.launchpad.net/bugs/1069498

Title:
  KWin shows tearing despite of VSync

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