X series are both IBM and LENOVO. Generalyy "60" and higher are Lenovo, except z60. See: http://thinkwiki.org/wiki/List_of_DMI_IDs#X_series
-- Screen brightness buttons don't work properly on Thinkpad Z61T https://launchpad.net/bugs/61184 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
