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I'm using Ubuntu 20.04 LTS on HP Laptop.

I'm experiencing some issues with certain key combinations in my laptop keyboard.

Following key combinations are not working.

  • Right Shift Key + E
  • Ctrl + C

Ctrl + other keys are working, also, c is working independently. Right Shift + other keys are working. Left Shift + E is also working.

Can anyone help me to identify if it is a configuration issue or an indication of an upcoming hardware failure?

I have used some diagnosis tools and identified these combinations ar re not detected. Would it be a hardware issue when these keys are working independently and in combination with other keys.

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To assess whether the keyboard is failing, you could use any application to monitor key presses. See options here, here, here:

  1. screenkey
  2. sudo evtest
  3. xev

You can perform further evaluations by:

  1. Booting from a Live USB and/or Windows. If the problem stems from your Ubuntu configuration, these should work.
  2. Using another keyboard in your Ubuntu.

All this should suffice to give an answer.

Related

  1. https://wiki.ubuntu.com/LaptopTesting/Keycodes
  2. https://manpages.ubuntu.com/manpages/focal/man1/showkey.1.html
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  • I have used these tools and found above key combinations are not detected. Would it be a hardware issue when these keys are working independently? and with other keys? Just these combinations are not working.
    – niyasc
    Nov 25 at 13:39
  • Try in a live session. If they work there you can rule out hardware. Nov 25 at 13:41
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I tried the tools suggested in the other answer, and found the mentioned key combinations are not detected, even though they are detected independently.

I tried pressing the keys a little bit harder, and now the key combinations are working.

So, I think there was some contact issue in the keyboard because of dust.

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