Dirk Heinrichs wrote:
> Sorry, but I don't get your point. How does this explain why root has a 
> correct $DISPLAY after using "su" or "su -"?
>   

it's probably pam related.

check /etc/pam.d/su

check if it has:

session    required     pam_env.so
session    optional             pam_xauth.so


then check /etc/security/pam_env.conf and make sure the DISPLAY option
is commented out.
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