After couple of years, I decided to return to Ubuntu, from Debian (sid). I used to work with KDE, so I installed Ubuntu 13.04 and "kde-standard" on my laptop.
SHORT: "Display configuration" is not available in Ubuntu+kde-standard, so I can not configure two displays... and default configuration is wrong. Tested Ubuntu+Unity and Ubuntu+Gnome3... both works well. Installing Kubuntu insted Ubuntu works, but I prefer Ubuntu.
LONG: I have two displays for my laptop: the laptop one and an external display that is connected throw HDMI port. Under Ubuntu+Unity, I can configure resolution and displays relative position (one relative to the other)... but not under KDE... and KDE does not use automatically the right configuration, it uses a mirrored screen, with 4:3 resolution on both screens.
In KDE, this should be fixed changing the configuration in "System Settings -> Display and Monitor".. where "Display Configuration" menu should be available, together with "Screen Locker". But there is no "Display Configuration" menu, only "Screen Locker", so I can not change resolution, what screen is the primary one, relative position, etc.
Tried Gnome 3 under Ubuntu and settings works perfectly.
Now, I have installed Kubuntu instead Ubuntu and there is "Display Configuration" menu... but I prefer >>>> Ubuntu... x_x
Can someone help me?