I have been trying to use my Dell Latitude E6410 with a docking station so that I can use dual monitor setup. When it worked it worked fine but after rebooting to laptop LCD the config was bad.

The actual post at LinuxQuestions: http://www.linuxquestions.org/questions ... on-920022/

Here is my experience:

* The 4 virtual desktops on one monitor and 4 on other.
* I could set up two wallpapers for two screens.
* However the virtual desktops for both screens were mapped one to one. If I switch to desktop grid on one screen it would show desktop grid on another monitor. And if I switch to virtual desktop one on one screen it switches to virtual desktop 1 on another screen. And the virtual desktops were kinda extended across the screens.
* Moving windows across virtual-desktop/screen worked great. While in desktop grid mode I could move window from virtual desktop 1 screen 1 to virtual desktop 3 screen 2 easily.
* The plasma taskbar was also movable across screen, which looked so cool.
* I think the semantics of virtual desktops and multiple screens is not so much worked upon and it can be made more intuitive.

Then I switched off my machine and a little while later I used it it with just the laptop monitor. The effects were disastrous. KDE still behaved as if with two monitor. I saw two different wallpapers over one another with one one of them visible at the left edge. Taskbar was missing. Desktop icons were missing. I deleted the kwinrc file and even lost the capability to show windows on screen. Even krunner was showing up and disappearing. Alt-tab would show the applications open but I couldn't switch to them.
I deleted all plasma config files and kwin config files and then it worked fine.

The solution I think is that when in dual/multiple monitor mode KDE should use separate configuration and when in single monitor mode use another configuration. When more/lesser monitors are there try to create new configurations accordingly. The customizations like adding/removing plasma applets, wallpaper change can be mapped to other configurations while user is is in one of the configurations.

In KDE 4.8 (using openSuse packages) the problem is partially solved. If I restart my machine with the other monitor removed I get only the plasma-desktop available on laptop LCD.

But if I remove the external monitor while computer is ON the monitor remove notification window is shown on external monitor (which I get to know when I plug in the monitor back).