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This article contains various sections to help KDE users troubleshoot their systems.

Opening GUI programs as root when signed in as another user

It could be a very bad idea to start GUI programs with root privileges. Only use the kdesu when absolutely necessary!

KDE, along with other desktop environments, include a special command in order to start graphical programs with root privileges. For KDE the command is kdesu. It can be used in the following manner:

user $kdesu <program>

Be sure to substitute <program> in the command above with the name of the program. A pop-up window should be displayed containing a text box for the root password. Enter the password and boom: happiness.

Get rid of the KResource Migration Tool pop-up

There have been reports that the KResource Migration Tool pops up on every login. There is no proper solution yet for this, but you can see a workaround in bug #353200.

Rebuilding the application database

If your KMenu lacks any application or the whole application list, you probably need to rebuild the KDE application database. It is also a possible fix for any KMenu related issues, like missing icons.

user $kbuildsycoca4 --noincremental

Akonadi complains about the MySQL config

Start by checking the permissions in /usr/share/config and /usr/share/kde4. If they're 700, you need to update them to 755 recursively.

root #chmod -R 755 /usr/share/config
root #chmod -R 755 /usr/share/kde4

If that doesn't solve the error, you need to open the akonadi configuration and change the default MySQL config. If you don't have the tray running, start akonaditray, select "Akonadi Server Configuration", activate "Use internal MySQL server" and then press the test button. If you want to use the MySQL server and not the embedded executable, you'll need to ensure that MySQL is running.

KDM fails to start

Start by checking the permissions in /usr/share/config. If they're 700, you need to update them to 755. Check previous section. If that doesn't solve the error, check the following notice in the kdm ebuild:

CODE KDM notice
If when you restart xdm, kdm fails to start with a message like "gentoo kdm[2116]: X server startup timeout, terminating" in /var/log/messages, uncomment the ServerTimeout line in "grep kdmrc /var/db/pkg/kde-base/kdm-4.3.1/CONTENTS | cut -f2 -d " "" and be sure to increase the timeout - 60 should work

Also be sure that the following services are started:

root #/etc/init.d/dbus status
root #/etc/init.d/consolekit status

If not, enable them by replacing status with start, and use the command rc-update add dbus default for every one of them to add them to default runlevel.

Finally, KDM could fail due to errors in xorg.conf. Take a look in your logs: /var/log/Xorg.0.log and /var/log/kdm.log and fix xorg.conf accordingly. For additional help you can find us on IRC at #gentoo-kde on Freenode.

The battery applet or solid notifications don't show the relevant info

So that the battery applet or other solid notifications can show the relevant info, you need D-Bus and ConsoleKit running:

root #/etc/init.d/dbus status
root #/etc/init.d/consolekit status

If not, enable them by replacing status with start, and use the command rc-update add dbus default for every one of them to add them to default runlevel.

Double-hibernate or crashes after hibernate (bug #363363)

KDE 4.6 handles "sleep button" events on its own, and the system correctly hibernates. If you have manually set up any other programs to handle these events (e.g. acpid), please disable that, as you may otherwise get double hibernation and/or system instability.

Shutdown, reboot, logout does not work (bug #326393)

There is some strange interaction between the sound system and the logout mechanism going on. Open systemsettings, and disable the "logout sound". Afterwards, logging out will likely work.

The desktop background covers all windows (bug #365623)

In rare cases, after working with several screens the desktop settings are not cleaned up properly. The result is that the desktop background seems to cover all windows. More details plus some manual workarounds can be found in KDE bug #260360.

No login possible, hangs at splash screen (bug 365637)

If you have been playing with unstable GNOME stuff (naughty, naughty!) you may encounter a so-far unexplained incompatibility. Logging in to KDE fails as soon as net-libs/glib-networking is installed. Unmerge that package and you should be fine.

See also