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

Rebuilding the application database

If the KMenu lacks any application or the whole application list, the KDE application database probably needs to be rebuilt. This is also a possible fix for any KMenu related issues, like missing icons.

user $kbuildsycoca5 --noincremental

Akonadi complains about the MySQL config

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

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

If that doesn't solve the error, open the akonadi configuration and change the default MySQL config. If the tray is not running, start akonaditray, select "Akonadi Server Configuration", activate "Use internal MySQL server" and then press the test button. To use the MySQL server and not the embedded executable, make sure that MySQL is running.

Unable to mount devices using KDE Plasma Device Notifier

If the error message "You are not authorized to mount this device." is being displayed when trying to mount devices by clicking on them in the KDE Plasma Device Notifier (USB-stick-like icon in the system tray), add the following file to the configuration:

FILE /etc/polkit-1/rules.d/10-udisks.rules
polkit.addRule(function(action, subject) {
	if (action.id.indexOf("org.freedesktop.udisks2.filesystem-mount") == 0 && subject.isInGroup("plugdev")) {
		return polkit.Result.YES;

This will allow all users who are members of the plugdev group to mount devices using the Device Notifier.

Use the following command to add users to this group:

root #gpasswd -a <username> plugdev
A reboot may be required for the changes to take effect.

Black screen after login

Make sure ~/.bash_profile does not have any interactive components like keychain. Check ~/.xsession-errors for the prompt for input.

Screen Tearing/Flicker when using Radeon graphics drivers

If there is severe flickering or "tearing" when using Radeon based graphics cards, it may be necessary to change the Compositor sync settings to something other than the default "Automatic":

CODE Modifying Compositor sync settings
System Settings --> Display Monitor --> Compositor --> VSync

Delayed response of KMenu, krunner etc.

Remove gles2 USE flag and rebuild affected packages, most importantly the (installed) packages from the dev-qt category, as well as kde-frameworks/plasma and kde-plasma/kwin.

Missing shutdown/reboot/suspend/hibernate buttons (with consolekit)

Make sure that kde-plasma/powerdevil and sys-power/upower are installed. Also check that the user is in the users group.

If x11-misc/sddm is used, run the following command and make sure it matches the output including nox11:

user $grep pam_ck_connector /etc/pam.d/system-login
session         optional        pam_ck_connector.so nox11

Another option is to create the following polkit rule for suspend (as per this comment from the KDE bugzilla):

FILE /etc/polkit-1/rules.d/10-suspend.rules
polkit.addRule(function(action, subject) {
    if (action.id == "org.freedesktop.upower.suspend") {
        return polkit.Result.YES;

Also ensure dbus is added to the default runlevel so that it is started before logging in with sddm:

root #rc-update add dbus default

If all else fails, try x11-misc/lightdm instead.

See also