I always see "this doesn't work, why?" posts, it's the first time I see a "this works, why?" post XD
this post was submitted on 02 Mar 2024
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I am a computer scientist after all
Flex that chaotic good!
Probably using ddcutil. There is a popular gnome extension for the same thing:
https://extensions.gnome.org/extension/2645/brightness-control-using-ddcutil
Correct. It's a combo of powerdevil and ddcutil. https://invent.kde.org/plasma/powerdevil/-/blob/master/CMakeLists.txt#L67
I don't even know this is possible!
This has been a game changer for me With this and the toggle for light/dark mode I can adjust the brightness of my screen without using the clunky interface of my monitor
It works for me as well - Asus VG259Q. I'm surprised my screen even has this feature, and even more surprised you can do that over DisplayPort. Even Windows doesn't have that lol
It's a very common feature for monitors, at least in my experience - both of my cheap AOC monitors support it, as well as all the other monitors I've ever connected my laptop to (a few HP and Samsung monitors iirc).
But it also feels kinda janky due to how long the display takes to change the brightness, so maybe that's why Microsoft decided not to support it?
Hm, maybe it's an issue specific to your screen? On my end the brightness adjustment is instant
Maybe. To be clear the delay isn't that large (my very rough guesstimate is somewhere between 100 and 300 ms, probably more towards the lower end), and if I just click somewhere on the slider, it feels fine.
It only feels janky when I drag the slider and the screen brightness updates in very noticeable steps. But that is how I naturally interact with sliders, so it's hard not to notice it for me.
Oh, it's the same then, thought we were talking about delay in seconds x3
Is it actually changing your display brightness or is it just doing a visual overlay like flux?
Real, and will even do all monitors too if you have more than one. I have one that doesn't support DDC and brightness doesn't change.
I noticed this as well a few months ago and it did change the monitor brightness for real, but now it broke on my system and wont do it anymore
There wont be a year of the Linux desktop, it will be little increment in users over time. Plasma 6 is AWESOME.. I noticed this feature with kde 6 so i guess its backed into it
This is the commit that "magically" made it work: https://src.fedoraproject.org/rpms/powerdevil/c/7ce3c53429c16e84bf805299b86fcc313701b1e6
Your post may be more constructive if you specified your distro (Fedora 39)
DDC/CI has been (re-)supported by powerdevil since https://invent.kde.org/plasma/powerdevil/-/commit/e4a5e5d3e017ef45979933e14e47408bb3a59dda and included in release starting from Plasma 6.0.0
So we are not talking about Plasma 6 but a random system update? What distro are you using? I have a "This is not working, why" story that I would love to get fixed magically: my laptop's brightness control stops working after the laptop sleeps for the first time after booting. No idea what to do about it, for the time being I use xrandr brightness under X ...
Not plasma 6, random fedora 39 update
Interesting, thanks for the answer.
Most displays support DDC, the feature has actually been in powerdevil for a while, but disabled due to bugs.
EDIT: modern displays*
I can change my screens too on desktop, pretty neat.
Unfortunately its a super simple implementation which doesnt take into account the brightness between different screens.
Ideally there should be a master slider and one per screen. The master slider should then use theother sliders current value as scaling factor to change them.
A more complex option could then also allow setting the brightness of each screen which would allow for better setting via the master slider. (not sure if this information is already available)