Comment 4 for bug 234811

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Bryce Harrington (bryce) wrote : Re: [Hardy] system freezes after setting resolution to 1440 x 900 with Radeon 7500 graphics card, when using DVI output, Acer AL1916W monitor

Does it also lock up if changing the resolution using the xrandr command line utility?
Also, please collect a backtrace from the crash - see http://wiki.ubuntu.com/X/Backtracing for directions.