[SOLVED] Weird root permission issue on Sway which is not present in i3

Hello fellow lemmings

I am a long-time i3 user and have decided to switch to Sway. I have encountered a weird error which has left me utterly bamboozled.

I am using Ubuntu 24.04 which has gone from 20.04 -> 22.04 -> 24.04. It has Ubuntu-Gnome, i3 and Sway currently installed.

The issue

The error that I'm facing is when I'm using Sway, I simply don't have sudo access.

This is what the error looks like

$ sudo visudo
[sudo] password for xavier666:
Sorry, user xavier666 is not allowed to execute '/usr/sbin/visudo' as root on <HOSTNAME>.

When I switch back to i3, my permissions are fine for the same user. I have not done any crazy modifications to the sudoer's file as far as I can remember.

PS: I have added a command to no-sudo xavier666 ALL = NOPASSWD: /usr/bin/brightnessctl

The "fix"

I temporarily solved it by adding xavier666 ALL=(ALL:ALL) ALL to the sudoer's file.

IMO, I think this should not be required. I don't remember ever adding the default user to the file for all the installations that I have done. (But this is the first time I've installed Sway)

Logs/Outputs

Running sudo -l without the fix (on Sway)

Matching Defaults entries for xavier666 on <HOSTNAME>:
    env_reset, mail_badpass,
    secure_path=/usr/local/sbin\:/usr/local/bin\:/usr/sbin\:/usr/bin\:/sbin\:/bin\:/snap/bin,
    use_pty

User xavier666 may run the following commands on <HOSTNAME>:
    (root) NOPASSWD: /usr/bin/brightnessctl

When I run the same command on i3, i get this (ALL : ALL) ALL extra line in the output. And when I run sudo -l with my fix on Sway, (ALL : ALL) ALL is present and the permission issue is fixed.

What is causing Sway to remove the root permission for the user?

Note: I'm just asking for the standard sudo behaviour. I'm not trying to run GUI applications as root.

Edit:

The issue was caused by swhkd. It was installed as a setuid binary (as instructed by the developer of the project). Once I switched back to sway's default keybinds and disabled swhkd, the permissions were back to normal. I removed my previous "fix" in the sudoers list and I still have sudo access.

Thanks a lot everyone and specially @gnuhaut@lemmy.ml for pointing me in the right direction.