Hi, all I found the CF in my machine ate up all alt keys besides the CF binding short cuts including Alt, such as Alt+F1,Alt+Tab,Alt+F2,etc. The scenario is when I enable compiz fuscion in my laptop T61p with nvidia newest driver, everything works fine and smoothly except no more application short cuts containing Alt. That means firefox doesn't have "Alt+F", "Alt+E", Emacs doesn't have "Alt+X". Especially for Emacs's "Alt+X", it's my most important things to use Emacs even use my laptop. So I have to disable compiz when I wanna use Emacs. I really have no idea what happened even after searching internet. I found when I use xmodmap to add Alt_L to the mod4 even the Alt_L and Alt_R is already set to mod1, the application short cuts work but the compiz short cuts retire... which means "Alt+Tab" doesn't work. The following is the output of my "xmodmap", I wish it would be helpful to identify the problem. Thanks. [yueyulin@t61p ~]$ xmodmap xmodmap: up to 2 keys per modifier, (keycodes in parentheses): shift Shift_L (0x32), Shift_R (0x3e) lock Caps_Lock (0x42) control Control_L (0x25), Control_R (0x6d) mod1 Alt_L (0x40), Alt_R (0x71) mod2 Num_Lock (0x4d) mod3 mod4 mod5 Scroll_Lock (0x4e) -- -- Yueyu Lin