I’ve been running into a strange problem since I upgraded to 11.2. I like KDE4 but it seems that plasma-desktop keeps freezing. Killing it and restarting seems to fix it most of the time, but it’s very annoying.
Clicking on the taskbar does not bring up applications, clicking on desktop icons is not responsive.
Alt-tab or Alt+F2 allows me to switch or launch new applications.
No, but I have an NTFS external drive. I’d file a bug, but since I’m not really sure what could make just plasma-desktop hang I don’t know.
Maybe I can run it with gdb debugger?
You definitely have a lot of repositories. Most of which I can see why. But you have the VideoLan and Packman repositories both enabled at the same time, which can cause a lot of applications to not work with mixed up libraries and dependencies. I’m not saying this is related to the freezing, but is something you should probably fix. The only thing you need from the VideoLan repository is libdvdcss. Then disable the repository. If you want to check for updates enable it again and only update the libdvdcss package. Then make sure all your multimedia codecs are from packman.
As for KDE freezing, I’ve never had problems, but your mileage may vary. Have you tried logging in as a different user and seeing if the freeze happens? Did you start with a new .kde4 folder? And are you using intel graphics, nvidia, or ati? If one of the last two have you installed the proper drivers? Just the first couple of things that crossed my mind.