It was probably a kernel problem, and I doubt the xorg.conf Option had anything to do with it. I assume it's fixed now anyway, since changing the backlight works on both of my Thinkpads.
** Changed in: linux (Ubuntu) Sourcepackagename: xorg => linux Status: New => Fix Released -- Changing display brightness kills GDM https://bugs.launchpad.net/bugs/77984 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs