This appears relevant: http://lists.x.org/archives/xorg-
devel/2010-June/010091.html
I quote:
Changes to the root background pixmap would previously cause the new
image to flicker into visibility briefy before windows were redrawn
over it. This was apparently caused by calling XClearWindow when the
_XROOTPMAP_ID property on the root window changed.
This patch fixes this by dropping the XClearWindow call and providing
a new function ("damage_screen") to force a redraw of the entire screen.
Most programs that change the root window pixmap will call XClearWindow,
anyway, so xcompmgr doing the same is redundant. However, dropping
the call makes it possible to use the _XROOTPMAP_ID property of the root
window to pass new pixmaps to xcompmgr from another process. The other
process can then neglect to call XClearWindow, resulting in a
flicker-free change to the new background image.
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https://bugs.launchpad.net/bugs/820553
Title:
Flicker upon session start
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