Root password request when changing screen brightness

[lxqt]

Root password request when changing screen brightness

[tsujan]

No, it doesn't require root password.

Closing because it isn't reproducible but you could add comments; also, it'll be reopened if someone can reproduce it.

[yasarciv]

When I try to change the screen brightness, it opened this window
https://i.imgur.com/E7w6LXe.jpg

[yasarciv]

Terminal output is:
yasar [ ~ ]$ lxqt-backlight_backend --dec 5
Couldn't open /sys/class/backlight/acpi_video0/brightness: Permission denied
yasar [ ~ ]$

[tsujan]

I don't know about lxqt-backlight_backend but lxqt-config-brightness is the tool for changing brightness under LXQt, whether with its GUI or with command-line -- see lxqt-config-brightness --help.

[yasarciv]

There is the same situation. The terminal output when I press the Cancel button:

yasar [ ~ ]$ lxqt-config-brightness -s 60
Error executing command as another user: Not authorized

This incident has been reported.
yasar [ ~ ]$

[tsujan]

It works here, with two laptops, and I'm sure it works for others too.

I'm afraid you need to find the hidden factor that makes your system have a different behavior.

[yasarciv]

Yes, I guess so. Thanks.

[tsujan]

Please tell us if you find it!

[yasarciv]

Hello again. I am tried to test this issue on Void Linux. But there is the same situation.

[yasarciv]

The common property here is that both Void and our distribution are not systemd.
Is systemd required for Lxqt?

[yasarciv]

Also, when the Lxqt-0.14 version was installed on Void Linux, it did not ask for the password, at the moment, the system update started asking the password with the Lxqt-0.16 version.

[tsujan]

Is systemd required for Lxqt?

That may be the reason. @luis-pereira, does the lack of systemd necessitate a password prompt for changing backlight?

at the moment, the system update started asking the password

Your system update is not related to LXQt.

[yasarciv]

Complete system update, include Lxqt.

[tsujan]

I meant that if your system update asks for password, it is not related to LXQt.

[tsujan]

Never mind, I think the misunderstanding was caused by your English.

Anyhow, we should wait for @luis-pereira to know about the password prompt without systemd.

[yasarciv]

I am sorry for my bad English. What I mean is the password request for the screen brightness adjust.

[yasarciv]

The problem on Void Linux is caused by the login manager. When I logged in with lightdm or sddm it didn't ask password while changing brightness. But when I logged in with lxdm installed by default, it asked password while changing brightness.

I will search for the source of the problem and try to solve the solution in our own distribution. Thank you for your interest.