In that case, it's probable that it's a hardware bug in that specific
monitor. Please collect the following with the monitor connected:
* Exact make and model of your monitor
* xrandr --verbose
* sudo get-edid | parse-edid > edid.txt
* sudo ddcprobe
** Changed in: xserver-xorg-video-ati (Ubuntu)
Status: New => Incomplete
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[Mobility X700] External monitor resolution can't be changed on laptop (ati
driver)
https://bugs.launchpad.net/bugs/227520
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