I'm trying to remap my right alt to behave like my right ctrl so I can use my right thumb to press the ctrl button. This is Ubuntu 12.04.

I've created the file .Xmodmap in my home folder with the following content:

clear control

clear mod1

!keycode 64 = Alt_L Meta_L

keycode 108 = Alt_R Meta_R

add control = Control_L Control_R Alt_R

add mod1 = Alt_L Meta_L

As you might guess, my left alt key has keycode 64 and my left alt key has keycode 108.

This actually works in the sense that my right alt key behaves as if I press the ctrl key.

However my left alt key now doesn't do anything anymore, which means I don't have an alt key left. This is strange given that xmodmap gives the following output:

xmodmap:  up to 4 keys per modifier, (keycodes in parentheses):



shift       Shift_L (0x32),  Shift_R (0x3e)

lock        Caps_Lock (0x42)

control     Control_L (0x25),  Control_R (0x69),  Alt_R (0x6c)

mod1        Alt_L (0x40),  Alt_L (0xcc),  Meta_L (0xcd)

mod2        Num_Lock (0x4d)

mod3      

mod4        Super_L (0x85),  Super_R (0x86),  Super_L (0xce),  Hyper_L (0xcf)

mod5        ISO_Level3_Shift (0x5c),  Mode_switch (0xcb)

The strange thing is that when I remove the Alt_R mapping onto control, the alt keys work.

(ie., change the second to last line to:)

add control = Control_L Control_R

Now even my right alt behaves as an alt key which confuses me. After removing the Alt_R mapping from the control line the output of xmodmap gives:

xmodmap:  up to 4 keys per modifier, (keycodes in parentheses):



shift       Shift_L (0x32),  Shift_R (0x3e)

lock        Caps_Lock (0x42)

control     Control_L (0x25),  Control_R (0x69)

mod1        Alt_L (0x40),  Alt_L (0xcc),  Meta_L (0xcd)

mod2        Num_Lock (0x4d)

mod3      

mod4        Super_L (0x85),  Super_R (0x86),  Super_L (0xce),  Hyper_L (0xcf)

mod5        ISO_Level3_Shift (0x5c),  Mode_switch (0xcb)

Hope you guys can help.

ps. I used this website as a source.