Although an xrandr script could work, if the dual monitor configuration
is intended to be permanent then a better solution is to supply a valid
xorg.conf.
I just had to do this when switching from the nvidia proprietary drivers
to nouveau (just experimenting). Jockey blows away the xorg.conf (for
good reason) but no suitable dual monitor configured xorg.conf is
supplied. This makes the lightdm + greeter revert to default behavior
which is to match lowest resolutions on both monitors.
If you scan your /var/log/Xorg.0.log, right at the beginning you'll get
the same log as the original bug reporter:
[ 8.567] Markers: (--) probed, (**) from config file, (==) default setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[ 8.567] (==) Log file: "/var/log/Xorg.0.log", Time: Thu Oct 13 14:22:37
2011
[ 8.579] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[ 8.579] (==) No Layout section. Using the first Screen section.
[ 8.579] (==) No screen section available. Using defaults.
[ 8.579] (**) |-->Screen "Default Screen Section" (0)
[ 8.579] (**) | |-->Monitor "<default monitor>"
[ 8.579] (==) No monitor specified for screen "Default Screen Section".
Using a default monitor configuration.
I do not recommend editing your xorg.conf unless you know what your
doing and can recover if the X server won't start.
The key requirements in a dual-monitor xorg.conf are:
1) a "ServerLayout" section that identifies the screen
2) the desired virtual size in Section "Screen"/Subsection "Display"
3) indicating which monitors are connected to which outputs
I've attached my xorg.conf *which is specific to my setup*. Do NOT copy
it your setup! I have provided here only to aid in understanding, in
conjunction with the xorg.conf man page and looking at your own
/var/log/Xorg.0.log
** Attachment added: "/etc/X11/xorg.conf"
https://bugs.launchpad.net/ubuntu/+source/unity-greeter/+bug/874241/+attachment/3056140/+files/xorg.conf
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https://bugs.launchpad.net/bugs/874241
Title:
Wrong resolutions in lightdm login screen when using external monitor
connected to laptop
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