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#1 2017-11-17 10:10:53

aatoma
Member
Registered: 2013-01-22
Posts: 29

[SOLVED] Screen brightness randomly goes to 0

Hi Folks,

I'm on a clevo laptop (Intel+Nvidia graphics controlled by bbswitch) with Arch+KDE regularly updated and experiencing the following issue: the screen goes completely black while I'm working (so nothing related to missing user input), and doesn't come back if I move the mouse or press a key.
This doesn't happen when I boot Windows on the same laptop.
I put 'brightness goes to 0' in the title since I recently discovered that I can have my screen back using the 'Fn+Brightness Up' key combination, so it seems like something is setting the brightness to 0 on purpose.
I can't remember when this started exactly, but a few months have passed for sure since I first noticed it and none of the threads found here (hardware issues, power management misconfiguration etc.) helped.
Any idea?
Relevant information I should post?

Regards.
Antonio

Last edited by aatoma (2017-11-21 22:34:00)

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#2 2017-11-17 10:52:01

lo1
Member
Registered: 2017-09-25
Posts: 584

Re: [SOLVED] Screen brightness randomly goes to 0

Keep a terminal open with

journalctl -f

and wait for it to happen, then share the last logs. Is this on xorg or wayland? Try to remember when this happened and please post your pacman log too.

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#3 2017-11-17 15:29:19

aatoma
Member
Registered: 2013-01-22
Posts: 29

Re: [SOLVED] Screen brightness randomly goes to 0

I'm on Xorg.
I'll post the output from journalctl, thanks.

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#4 2017-11-20 03:38:53

NoSuck
Member
Registered: 2015-03-04
Posts: 157
Website

Re: [SOLVED] Screen brightness randomly goes to 0

A couple other places to look for hints:

  • DPMS and Screen Saver sections of xset -q

  • /etc/systemd/logind.conf

On my system, systemd triggers IdleAction every IdleActionSec, regardless of user input--so you may want to comment that line out.

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#5 2017-11-21 22:33:06

aatoma
Member
Registered: 2013-01-22
Posts: 29

Re: [SOLVED] Screen brightness randomly goes to 0

Hi Again,

nothing happened since I started monitoring things with journalctl (it used to happen two or three times per working session, before).
I'll mark this as solved and maybe reopen it with more information if it pops up again.

Thank you anyway.
Antonio

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