Public bug reported:

In Ubuntu 8.04, after attaching an external monitor and pressing the
"detect displays" special key sequence (fn-F7) on my Lenovo X61s, the
external monitor would immediately display a mirror of the laptop's
monitor, at the native resolution of the external monitor.

While Ubuntu 8.10 offers more flexibility in its configuration, it has
eliminated this sensible default.  Now, when connecting an external
monitor, I must manually go to "System -> Preferences -> Screen
Resolution" and manually enable and choose a resolution for the external
monitor.

Additionally, Ubuntu 8.10 now restricts mirrored external resolution to
the internal monitor's resolution.  I am limited to the smaller of the
two resolutions, so to use the external monitor at native resolution
with a non-extended desktop, I must manually enable the external monitor
in non-mirroring mode, select its appropriate resolution, and disable
the laptop's internal screen.  Before unplugging the external monitor, I
must re-enable the internal display, or I will be left without a display
(8.10 does not automatically turn the internal monitor back on when
unplugging a display).

While keeping the new flexibility in extended desktops, Ubuntu should
return to the default behavior from 8.04 of automatically mirroring
displays to the larger resolution when connecting an external monitor,
and automatically returning to the normal laptop screen resolution when
the monitor is unplugged.

** Affects: ubuntu
     Importance: Undecided
         Status: New

-- 
external monitor defaults regression in Ubuntu 8.10 (Lenovo X61s)
https://bugs.launchpad.net/bugs/299653
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