Hello, I installed Garuda about 2 months ago, I used it alternately with Windows due to a few stubborn games and a bit out of habit, but I spend more and more time only with Garuda. I noticed one function that was there and worked from the very beginning, but I didn’t pay attention to it before. I mean the ability to adjust the screen brightness. I have a desktop computer, the monitor is connected to the graphics card with a DVI cable and nothing else. In Windows, I struggled for a long time to enable the ability to adjust the brightness from the system level, but such an option was only available in laptops, and flux did not suit me very well. I have already accepted the need to change the brightness directly on the monitor several times a day depending on the time of day. Until now it occurred to me that here such a function is built into the system, next to the volume control slider there is also a brightness control slider. And to my surprise - it works! A great and very useful function that Windows does not support in a desktop computer, and Garuda proves that it is possible. I just do not understand how and why it works. I thought that the DVI cable does not have any advanced functions and can only transmit the image. And now, when changing the brightness in the system, a second passes and the monitor’s brightness changes. I checked in the settings of the monitor itself and its settings actually change, this is not a simple fake by, for example, dimming the image by the system. The monitor settings show exactly the same value that I select in the system. Could someone explain this to me?
Black magic + voodoo = brightness control slider. 
All joking aside, the only logical explanation is that M$ is too stupid to code windows properly. 
Well, they’re certainly not too stupid at SpyOS. They simply don’t care what users want and need. Their intentions and purposes take precedence over everything else.
That’s their main practice from W10, in the past I had W8.1 and it was very good, even after MS finished support. But when Nvidia also stopped upgrading their drivers, and even Google didn’t upgrade their browser, I was forced to install newer system. So I had W10 for… I don’t remember exactly, perhaps about 3 years or more.
Today I tried to backup photos from my girlfriend’s phone to her PC. I connected it by wire and the windows file explorer crashed every time, like always. It just can’t process so many files or I don’t know. So I connected it to my PC with Garuda and voila, it’s just copying files without any problem. I don’t understand how MS can share so broken software. And here, when I checked, this whole system is made by several people. Several people who work on this system in their free time outside their main job vs thousands of well-paid programmers whose job it is to create this caricature of an operating system called Windows. It’s just amazing.
My expression of the week 
I refer to it as “Spyware that masquerades as an OS”.
lol i had this same and talked to @nepti haha =)
look some stuff here and welcome =)
hdmi to dvi adapter used with brightness control
To the best of my knowledge this KDE feature only works if you have the “Night Light” enabled. I do not like KDE’s “Night Light” feature, and I always keep it disabled. So the native brightness control isn’t available to me.
However, I did find a KDE Plasmoid that allows me to control my screen brightness. It is only for 11 and XRandR, there is no Wayland support, but I don’t use Wayland anyways. The Plasma widget below works perfectly to control the screen brightness on my HTPC computer with a Sony big screen TV connected via HDMI cable.
Download the plasma-screendimmer widget from the KDE store:
or:
Download and copy the folder containing the plasma widget to:
~/.local/share/plasma/plasmoids/
Then use the “install from file” option to make the widget available as a “New” item in the “Plasma Widget Control Panel”.
The new widget will be named “Sceen Brightness” in the “Plasma Widget Control Panel”,
Enter edit mode and drag the plasmoid from the “Plasma Widget Control Panel” to either the desktop or taskbar and you’re golden.
Just FYI for those using X11, who like myself do not like to use KDE’s “Night Light” feature.
I just checked and the night light option is disabled. The brightness control works anyway. The only thing is the icon doesn’t match to others, it’s… just usual, similar to Windows. Everything works fine, that’s the most important thing.
The icon has been like that since plasma 6. its partly due to how kde deals with it an how Beautyline icon pack is. I think someone reported it but maybe a request should be made on its pling since they don’t seem to have a github? But the last update was v2.4 on 2024-04-19.
but it looks like a fix is,
If someone wants a fix : cd ~/.local/share/icons/BeautyLine , then ln -s actions/scalable/contrast.svg apps/scalable/brightness-high-symbolic.svg
But I haven’t tested it. Maybe this could be patched in the Garuda Linux 🦅 / Themes and Settings / Artwork / BeautyLine · GitLab pack.
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