[Bug 101827] Tearing with i965 + modesetting

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101827

--- Comment #1 from moosotc at gmail.com ---
I've made a fatal mistake of assuming that not having Driver="intel" inside
the Device section will make X pick up modesetting by default, alas, it picked
intel in my case, so everything that has been said in this bug report and 
in the mailing list posts applies to intel driver not modesetting. Sorry about
that.

The tearing state of affairs with modesetting are as follows - no amount of
tinkering with xrandr has any effect on tearing, the teartest example from the
previous comment always tears, well, only when it doesn't and it doesn't in two
cases (at least those are the ones I've came across):

a) The window covers whole screen and there is nothing on top of it
b) The window is "strategically placed in the vertical direction"
   (for example teartest with default window size of 640x480:
        xdotool search nswaps windowmove 0 0   - tears
        xdotool search nswaps windowmove 0 120 - does not tear)

If the screen was reflected/rotated tearing is always there for fullscreen
windows.

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