Comment 13 for bug 830949

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Chris Halse Rogers (raof) wrote : Re: [Intel N10 Graphics] Plugging in external monitor to VGA port makes both displays corrupted with thick slanted lines

This situation should no longer be easy to trigger - as a workaround for Oneiric we've disallowed setting a broken setup in gnome-desktop's RANDR code (see bug #824099).

Users could still manually set a broken mode with the xrandr commandline tool, but GNOME should no longer automatically set a broken mode, and will not allow the GUI tools to set a broken mode.