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Neither of the ctrl keys work. I have a Lenovo Yoga 13 with OpenSUSE 15, and have set the BIOS to switch the left ctrl with Fn. In that case the left ctrl (now mapped to Fn) works.

I get nothing on showkey -k on tty1.

How do I make sure if it's a hardware issue or software?

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You can run xev command and check keysyms/keycodes output.

Little white box will popup, press Ctrl and check the output.

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  • xev doesn't give anything either. And I think (?) showkey is at the kernel level, so should be a better check for hw problems.
    – xcorat
    Dec 18, 2018 at 22:34
  • How about trying some other distro Live CD, and check if Ctrl is working that way? If it doesn't, it might be hardware issue.
    – ivanderz
    Dec 19, 2018 at 11:14

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