Unable to authenticate/execute the action (Code 4) KDE 4.8.5 Slackware 14 RC2 32 bit
 

When I try to do some actions from KDE in System Settings (e.g. auto login of my user "eduardo" without password) and I click Apply, the system ask me for root password and after try 3 times I get the message:

I'm using Slackware (current) 14 RC2 32 bit and KDE 4.8.5. The password is correct because I can start root session in terminal and kdesu also accept it. For now I can work with:

or whatever app.

Any ideas? Thanks in advance.

This could be a keyboard layout problem.

I would check that in KDE settings - I can't say where/how though as I don't use KDE that much.

In addition, if not already done I would do this as root:

Then edit /etc/X11/xorg.conf.d/90-keyboard-layout.conf to replace "us" by your locale in following line:
Then restart X or reboot.

I frequently toggle the keyboard layout between Spanish and English from KDE system settings, anyway I tried what you say but still not working.

Thanks.

Still having the same error when trying to change time in KDE 5_17.11.
Any thoughts?

Wrong thread. Please post in an existing and relevant thread or open a new one for your issue.