@Matt

This bug report is about a case in which the command

xrandr

reports the right resolutions for the external monitor but the user can
see any changes on his display until he does a VT switch. If xrandr
doesnt report/detects the right resolution for your external monitor,
you have another bug lool for bug reports about edid or post a new
report.

If xrandr reports 1680x1050 in the detected modes try to set it using
something like

xrandr --output VGA-0 --mode 1680x1050

and if you see the right resolution just after a VT switch (Atl+Ctrl+F1,
wait, Atl+Ctrl+F7) then you should keep posting in this bug report.

-- 
External monitor resolution can't be changed on laptop (ati driver)
https://bugs.launchpad.net/bugs/227520
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