I was experiencing the same flickering with my dual-monitor setup in
KDE4. I disabled the TV and TMDS-1 output (I got the names from xrandr,
which was showing them as additional outputs to LVDS and VGA), by
changing my /etc/X11/xorg.conf file with the following options:
Section "Device"
Identifier "Configured Video Device"
Driver "intel"
Option "monitor-TMDS-1" "dvi"
Option "monitor-TV" "tv"
Option "monitor-VGA" "vga"
Option "monitor-LVDS" "lvds"
EndSection
Section "Monitor"
Identifier "dvi"
Option "Ignore" "true"
EndSection
Section "Monitor"
Identifier "tv"
Option "Ignore" "true"
EndSection
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Screen flickers with KDE4
https://bugs.launchpad.net/bugs/278471
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