I've managed to reproduce the problem on a colleague's Toshiba laptop.
Mirroring (via xrandr --auto ) worked but setting side by side mode in
gnome-display-properties caused a lock up.
00:00.0 Host bridge [0600]: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML
and 945GT Express Memory Controller Hub [8086:27a0] (rev 03)
Subsystem: Toshiba America Info Systems Device [1179:ff10]
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[i915gm] [Karmic] X freezes when using compiz on external monitor
https://bugs.launchpad.net/bugs/441873
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