http://bugs.freedesktop.org/show_bug.cgi?id=22852





--- Comment #8 from Alex Deucher <ag...@yahoo.com>  2009-11-28 16:52:29 PST ---
(In reply to comment #7)
> This flickering is caused by xrandr queries (gnome-settings-daemon does these,
> as do several SDL apps I've run). I can reproduce by simply typing xrandr
> (without options) in a terminal.
> 

When apps query randr, it probes the outputs for monitors.  If no monitors are
connected, the analog ports use load detection to check for monitors which
causes a flicker.  IIRC, a new randr call was added that just gets the current
config rather than re-probing the outputs.  You can disable load detection
using xrandr:
xrandr --output <output> --set "load detection" 0


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