Same issue here:  `xrandr --auto` indeed enables the external monitor
with mirroring at a higher resolution than my internal display, but not
at the external display's native resolution.  It enables my Dell 2207WFP
at 1600x1024 (3x2), where it should be 1680x1050 (16:10).  Unable to
handle this non-native resolution, the Dell cuts off the top third of
the screen.

I change the resolution in "Monitor Resolution Settings" to the proper
resolution after `xrandr --auto`, so long as I am careful not to bump
the screen out of mirroring mode, which subsequently limits the
resolution to the laptop's native resolution.

cheers,
Charlie

-- 
automatically mirror displays to the larger resolution when connecting an 
external monitor
https://bugs.launchpad.net/bugs/299653
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