No, the above is not relevant. The actual flickering comes from
Metacity, it has a debug mode "show_redraw" which runs this piece of
code in compositor-xrender.c:
if (DISPLAY_COMPOSITOR (display)->show_redraw)
{
Picture overlay;
dump_xserver_region ("paint_all", display, region);
/* Make a random colour overlay */
overlay = solid_picture (display, screen, TRUE, 1, /* 0.3, alpha */
((double) (rand () % 100)) / 100.0,
((double) (rand () % 100)) / 100.0,
((double) (rand () % 100)) / 100.0);
XRenderComposite (xdisplay, PictOpOver, overlay, None, info->root_picture,
0, 0, 0, 0, 0, 0, screen_width, screen_height);
XRenderFreePicture (xdisplay, overlay);
XFlush (xdisplay);
usleep (100 * 1000);
}
DISPLAY_COMPOSITOR (display)->show_redraw seems to not be initialised at
Metacity start. I'll have a patch to submit which will fix this.
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https://bugs.launchpad.net/bugs/820553
Title:
Flicker upon session start
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