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Recently I have installed Fedora 25 Linux with KDE Plasma 5.8.5.

Programs running in konsole or in xterm do not receive any keyboard input when Alt+H is pressed. All other Alt+key combinations are fine, but Alt+H does nothing. I have searched the keyboard shortcuts in the system settings, but do not see Alt+H bound to any function.

I have tried a different keyboard layout to rule it out as a problem source.

How can I check what is consuming the Alt+H keypress or otherwise debug this issue?


Quick check on the command line (i.e. in a terminal window): press ctrl-V alt-X, you should see ^[X (i.e. [escape] X). Works for all letters except H on my system.


UPDATE: Some weeks and few software updates later the problem is gone. I think it must have been a bug. The question how to debug such issue remains open.

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  • Works here on FC25. What does xev report?
    – phg
    Feb 14 '17 at 14:20
  • @phg Alt-J (for comparison) produces these events: Alt-L key press, J key press, J key release, Alt-L release. That looks good. But Alt-H is different. Alt-L key press, FocusOut, FocusIn, KeymapNotify, H release, Alt-L release. Could you decode what is going on there? If it is important, I will append the entire xev output to the question.
    – VPfB
    Feb 14 '17 at 14:43
  • Just a note to my first comment. Alt-L means the left Alt key, and not the Alt key + the L key combination. Sorry for the confusing notation.
    – VPfB
    Feb 14 '17 at 16:33
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I had the same issue and found an advice here: https://www.reddit.com/r/archlinux/comments/exvxqx/plasma_what_is_grabbing_my_alth_and_altk_shortcuts/:

Settings > Workspace > Window Management > Task Switcher... Those two shortcuts for "Current Application" Forward and Reverse. Cleared them and all is good now...

Hope it helps to someone.

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