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I'm using Slackware 10.1 with a 2.6.10 kernel.
If I load up Fluxbox (or KDE, whichever GUI it doesn't matter), load up a terminal and run something like xine, it works perfectly in my user.
However, if I go su and then try and run xine (or anything that tries to use X) I get an error message:
Xlib: connection to ":0.0" refused by server
Xlib: No protocol specified
Cannot open display
Any ideas? I need to be able to run programs as root in the GUI really.
export DISPLAY=:0 #assuming it wasn't set already
xauth merge ~user_in_x/.Xauthority
Also "xhost +local:" is better than just "xhost +", but not as good as the above. The above xauth command only allows root to use X, "xhost +local:" allows anyone locally at the computer, "xhost +" allows anyone who can connect to your computer. And the xauth usually only works as root and the xhost only works as the user currently in X.
Just wanted to add, I'm sure you must know this, but just in case, you can startx as root. And if you've display 0 running with your user, you can use startx -- :1 to open another X server (can access it with CTRL+ALT+F8).