I have been having this problem for a while now and it has seemed
random. All of a sudden I can't open any more programs, nothing
happens. If I try to open a program in a console I get something like:
gedit
No protocol specified
Cannot open display:
Run 'gedit --help' to see a full list of available command line
options.
I check the display variable and it looks fine. I finally narrowed it
down to something with networkmanager. I will be fine until I switch
networks in networkmanager. If networkmanager always stays on the
same network I am fine, but if I dare change networks I am then
forced to kill X and re-log back in to be able to open anything new.
What is causing this? Has anyone else experienced it?
I found that the HOSTNAME variable was being reset to
localhost.localdomain.com after networkmanager started up on my
distro. I don't know where networkmanager was getting its information
from on my distro so I simply added a HOSTNAME=$YOURHOSTNAME to my
dhcpcd configuration file. On my distro its in /etc/conf.d/dhcpcd