there's probably a few of you stratching your heads thinking what is GRSecurity and PaX ? so here's a little stolen info from gentoo lol
http://www.linuxcoin.co.uk/wiki/index.php/GrsecurityYou may also want to consider adding the command "xhost +"
I know to launch my SmartCoin on the Prefinal from ssh I have to run the following
DISPLAY=:0 xhost +
DISPLAY=:0 sudo smartcoin
Otherwise SmartCoin will error
here's a safer way lol it was already on the wiki

sudo su
chmod uog+rw /dev/ati/card*
xauth merge /home/user/.Xauthority
export DISPLAY=:0
smartcoin
will all of those commands need to be run after each reboot or will the chmod and xauth part stick around? I am using persistence on this setup
No you will have to run
sudo su
xauth merge /home/user/.Xauthority
export DISPLAY=:0
Everytime or you can just save it as a script and run it everytime you log in.
#!/bin/bash
xauth merge /home/user/.Xauthority
export DISPLAY=:0
save that as /usr/bin/setup_ssh
then
chmod 777 /usr/bin/setup_ssh
next time you login all you need to do is.
sudo su
setup_ssh