As asked on #5 I tried to use this command:
xrandr --output LVDS1 --mode 1024x768
and this one
xrandr --output LVDS1 --mode 800x600
But when I launch these commands from a terminal, the screen goes black,
I tried to wait for about 2 miniutes, but seeing nothing happen, I typed
in CTRL+ALT+F1 and then CTRL+ALT+F7, doing this I get the resolution I
typed in the command line ( 1024x768 in the first command an 800x600 in
the second).
But if I go back to 1366x768 using the monitor settings in system
settings and try again to change to 1024x768 or 800x600 I get the same
problem, the screen goes black for about 20 seconds and comes back to
1366x768.
** Changed in: gnome-control-center (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/840974
Title:
configuration of external monitor on laptop does not work properly
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