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When I press Left Ctrl, my xev output shows this:

FocusOut event, serial 37, synthetic NO, window 0x5600001,
    mode NotifyGrab, detail NotifyAncestor

When I press Right Ctrl, there's no FocusOut event. Why so?


Problem background:

When I press Enter and then Ctrl+V really fast, the Ctrl+V doesn't work (it doesn't paste anything). I narrowed down the problem using xev. When I press Enter and then immediately Ctrl+V, the "V" isn't registered by operating system. Instead, it's stuck on Ctrl, displaying the FocusOut event. However, it works alright with Right Ctrl.

I thought that Left Ctrl shouldn't trigger FocusOut in the first place, and asked the question.

  • Are you using any VM hosts? Its not uncommon for left ctrl or left alt to be an escape key. – Linef4ult Jan 19 '16 at 11:23
  • @Linef4ult good idea, but no, VirtualBox isn't launched (although it's installed). – Denis Gorbachev Jan 19 '16 at 16:04
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Turned out, Left Ctrl was mapped to "Maximize window" :)

Unmap, reboot - and it works perfectly!

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