I have some problem. Every 3-5 second everything, that I input from keyboard became UPPERCASE only. I also have two keyboard layouts: us and ua. And when uppercase happens - I can't switch my keyboard layout (I use mod4 for switching).This is my xmodmap output:$ xmodmapxmodmap:  up to 3 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),  Meta_L (0xcd)mod2        Num_Lock (0x4d)mod3      mod4        Super_R (0x86),  Super_L (0xce),  Hyper_L (0xcf)mod5        ISO_Level3_Shift (0x5c),  Mode_switch (0xcb)I tried xmodmap -e clear lock, but uppercase input still periodically turns on. I tried to disable Caps Lock key in hardware way, putting insulator between keyboard contacts. But I doesn't help.== Update == For A#1Look, there is sticky Caps_Lock:KeyPress event, serial 40, synthetic NO, window 0x2a00001,    root 0xaa, subw 0x0, time 30893676, (-254,229), root:(384,359),    state 0x2, keycode 39 (keysym 0x53, S), same_screen YES,    XLookupString gives 1 bytes: (53) S    XmbLookupString gives 1 bytes: (53) S    XFilterEvent returns: FalseWhat I'm doing? First, I run florence (Virtual Keyoards) and turn off Caps_Lock key. Second, I type: xmodmap -e clear lock. But it is very dirty hack :), you know. It works for few minutes or few hours.
Uppercase input turns on periodically
keyboard;keyboard layout
I plugged in USB keyboard. In GRUB menu I added into kernel string: i8042.nokbd (after quiet).Also, if you need to turn-off notebook keyboard while working, use xinput.First execute xinput list, than find line with AT Translated Set 2 keyboard.Then xinput list-props 'AT Translated Set 2 keyboard' or using id (14 for example) xinput list-props 14.Find Device Enabled and xinput set-prop 'AT Translated Set 2 keyboard' 'Device Enabled' 0 or using id xinput set-prop 14 134 0.