I attached a comment to https://launchpad.net/ubuntu/+source/xorg/+bug/92667 that might be related. But my issue involves any Xorg based distro and includes FF Herd 5 which I tried earlier today.
-- X server install writes wrong ModeLine for ATI Mobility Radeon zt3000 https://launchpad.net/bugs/59827 -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
