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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

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[✅Fixed]Monitor drops to 30% brightness after suspend (feddit.org)

submitted 2 days ago* (last edited 2 days ago) by instantnudel@feddit.org to c/linux@lemmy.ml

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Hey, I hope someone can help me.

Problem:

When I wake my PC from suspend, my monitor is always set down to 30% brightness for some reason.

These are the brightness settings of the monitor itself, which can only be accessed via the monitor settings using the buttons on the monitor. I do not mean the brightness settings of my desktop environment. These are still set to 100%, even though the monitor is darker.

The problem also arises in a second case. When I lower the brightness in the brightness control of my DE, my monitor brightness is also lowered in the monitor settings down to 30% again. I can then no longer increase the brightness in the DE settings, because 100% in the DE now equals 30% in the monitor. So if I set the brightness to 50% in the DE for example, this is 50% of the 30% set in the monitor. So actually only 15% in real terms

I hope I was able to explain the problem clearly. Please ask if you don't understand something. It's really annoying because I need to turn up my screen brightness with the Buttons on the Monitor every single time I wake up my PC.

Technical data:

Nobara Linux 41 (Based on Fedora)
KDE Plasma 6.3.3
Wayland
Desktop PC. So a external monitor. Not a laptop monitor.
I have a 2nd monitor on which this does not happen.

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[–] JTskulk@lemmy.world 3 points 2 days ago

I saw this problem for the first time yesterday. Run dmesg to look for errors from the kernel, for me I had amdgpu 0000:03:00.0: [drm] *ERROR* dc_dmub_srv_log_diagnostic_data: DMCUB error - collecting diagnostic data. I took this to mean that my system couldn't communicate with the monitor to change brightness anymore. When my system is idle, it first dims the monitor before turning it off, so when I wake it back up it's stuck on low brightness like this. Simply turning my monitor off and back on seemed to fix it.