I solved my problem installing xserver-xorg-video-intel and using intel video driver instead of i810 one.
-- X crashes when trying to use LCD brightness buttons on Thinkpad X60 https://bugs.launchpad.net/bugs/95937 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
