Такая проблема, монитор не определяется как отдельный, отображает то же окно, что и на дисплее ноута.
Вот такое показывает Displays:

xrandr вот такое пишет:
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 1920 x 1080, current 1920 x 1080, maximum 1920 x 1080
default connected primary 1920x1080+0+0 0mm x 0mm
1920x1080 77.0*
Поискал, нашел вот такое
https://forum.ubuntu.ru/index.php?topic=143326.msg1052926#msg1052926Поставил synaptic, там у меня стоит xserver-xorg-video-intel-lts-xenial и xserver-xorg-video-intel-lts-trusty. Про первый написано, что он deprecated. Снести их можно, но поставить xserver-xorg-video-intel не получается, пишет про broken packages.
Пробовал руками как-то подчистить, вот такие результаты:
duvarenkov@laptop:~$ sudo apt-get install xserver-xorg-video-intel
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
xserver-xorg-video-intel : Depends: xorg-video-abi-15
Depends: xserver-xorg-core (>= 2:1.14.99.902)
E: Unable to correct problems, you have held broken packages.
duvarenkov@laptop:~$ sudo apt-get install xserver-xorg-core
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
gnome-control-center : Depends: libcheese-gtk23 (>= 3.4.0) but it is not going to be installed
Depends: libcheese7 (>= 3.0.1) but it is not going to be installed
unity-control-center : Depends: libcheese-gtk23 (>= 3.4.0) but it is not going to be installed
Depends: libcheese7 (>= 3.0.1) but it is not going to be installed
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
duvarenkov@laptop:~$ sudo apt-get install libcheese-gtk23 libcheese7
Reading package lists... Done
Building dependency tree
Reading state information... Done
libcheese-gtk23 is already the newest version.
libcheese7 is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
duvarenkov@laptop:~$ sudo dpkg --remove --force-remove-reinstreq libcheese-gtk23 libcheese7
dpkg: dependency problems prevent removal of libcheese-gtk23:amd64:
unity-control-center depends on libcheese-gtk23 (>= 3.4.0).
gnome-control-center depends on libcheese-gtk23 (>= 3.4.0).
cheese depends on libcheese-gtk23 (>= 3.4.0).
gnome-contacts depends on libcheese-gtk23 (>= 3.4.0).
empathy depends on libcheese-gtk23 (>= 3.4.0).
dpkg: error processing package libcheese-gtk23:amd64 (--remove):
dependency problems - not removing
dpkg: dependency problems prevent removal of libcheese7:amd64:
unity-control-center depends on libcheese7 (>= 3.0.1).
gnome-control-center depends on libcheese7 (>= 3.0.1).
cheese depends on libcheese7 (>= 3.5.1).
libcheese-gtk23:amd64 depends on libcheese7 (>= 3.4.0).
gnome-contacts depends on libcheese7 (>= 3.0.1).
dpkg: error processing package libcheese7:amd64 (--remove):
dependency problems - not removing
Errors were encountered while processing:
libcheese-gtk23:amd64
libcheese7:amd64
duvarenkov@laptop:~$ sudo apt-get install libcheese-gtk23 libcheese7
Reading package lists... Done
Building dependency tree
Reading state information... Done
libcheese-gtk23 is already the newest version.
libcheese7 is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Короче ничего не вышло у меня.
Пользователь добавил сообщение 03 Ноября 2016, 11:34:54:
Всё-таки переустановка пакетов видимо помогла, т.к. после перезагрузки определился монитор.