You would add a line to your /etc/init.d/bootmisc.sh near the bottom of the file to be set on boot like this:
Code:
export __GL_SYNC_DISPLAY_DEVICE=CRT-?
Replace the ? with the proper value from the /var/log/XFree86.0.log for the tv-out. Although now that I am thinking you may want to test it first at a console login (logout from KDE and choose console login from the menu option at the greeter screen) login as normal user then use su to become root then open the file /root/.bashrc for editing and add the line above to the file and then source /root/.bashrc to re-read the file and then to make sure the export worked echo $__GL_SYNC_DISPLAY_DEVICE and it should display the value you put in the file if so then /etc/init.d/kdm restart to restart X and get a new KDE greeter screen with the variable being present for use by the driver and check to see if it works. Do not forget to edit as root the /root/.bashrc to remove the line you put there for the test.