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I have recently transitioned from CentOS 7.9 to AlmaLinux 8.9, and I have noticed a permission error when executing the following command:

$ setserial /dev/ttyAP0 closing_wait none

I get the following output:

Cannot set serial info: Operation not permitted

My user account is part of the dialout group which I believe needs to be done when wanting to communicate to serial devices, but apart from this I am not sure what else could cause this error message.

When executing the following command, I can confirm I am part of the dialout group:

$ groups tester

enter image description here

If I list out my serial ports on my machine, I can see they are part of the dialout group.

$ ls -l /dev/ttyAP*

enter image description here

I don't run the command via sudo on either Linux Distro, so is there anyway I can identify the cause of the message in AlmaLinux.

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  • Did you logout/login after you added yourself to the dialout group? Check with id. Did you verify that dialout is the right group and device with ls -l /devttyAP0
    – waltinator
    Commented Oct 10, 2024 at 19:09
  • Hello @waltinator I have restarted my machine and checked for the correct permissions of my listed serial ports.
    – hymcode
    Commented Oct 11, 2024 at 8:26
  • Please edit your Question and show the results of the commands I suggested.
    – waltinator
    Commented Oct 11, 2024 at 13:55
  • Hello @waltinator, I have updated my question with the commands you've suggested. Are you not able to see them ?
    – hymcode
    Commented Oct 11, 2024 at 14:12
  • As a test, what happens if you change your account's primary group to dialout and invoke the command?
    – Sotto Voce
    Commented Oct 12, 2024 at 18:17

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