[Bug 32789] VSync loss after rotation to portrait mode

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=32789

--- Comment #1 from Maarten Maathuis <madman2003 at gmail.com> 2011-01-03 06:11:26 PST ---
Landscape mode is the default rendering mode (it's called normal), anything
else causes the X server to create a new frontbuffer and render with a
transform onto this rotated frontbuffer (this process isn't backbuffered last
time i checked). Everytime the X server receives "damage" on the "normal"
frontbuffer it will update the rotated frontbuffer. This transform happens
outside compiz/opengl (which was used to get the vsync). This is just a generic
story, not sure if this is easy to fix for amd hardware.

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