[Bug 85910] Massive graphical corruption on wide multihead display

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85910

--- Comment #7 from Adam Nielsen <a.nielsen at shikadi.net> ---
The --glx-swap-method takes parameters 0 through 6, and 0, 4 and 6 do actually
work.  But 1, 2, 3, and 5 cause corruption.  I believe 2 is double-buffer and 3
is triple-buffer.  Including or omitting the --paint-on-overlay option has no
effect.

It looks in many ways like old buffers aren't being erased, because the
corruption can be anything from what was displayed previously on one screen
suddenly appearing in the middle of another screen, or the contents of one
screen being drawn on another but if the screen's width is different then there
is a stair-stepping effect.  This is in units of say eight pixels high, as the
image is drawn across the display and when the horizontal edge of the image is
reached, it keeps drawing from the next row.  Looks just like when you load an
image file with the wrong width and a little bit of the next row gets drawn on
the end of the previous row.

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