KDE Multi-montor setup + Disabling KScreen

attishno1 · 2023-11-21 06:09:42

Thank you for viewing!

As you may know, on X11, KDE does not have a solution that will let a person scale monitors individually. They have a global scale option. The problem is that I have three monitors. The monitors from left to right have the following resolutions:

1650x1050
2560x1440
1920x1200

I require the one in the middle to be at 150% scaling. The problem is that the leftmost monitor (1650x1050) becomes unusable after that.

One method that i have found is to use nvidia-settings to setup a custom xorg.conf files by setting up the viewPortIn values to 2307x1440 for the left and right monitors. The problem is, KDE doesn’t read these values.

One way of making the KDE read values is by disabling KScreen in background services. The problem is that KDE doesn’t support gaps in monitors, so I was wondering if there is a solution that KDE Plasma provides that would help me setup this custom resolution without breaking the system or cause instability.

jojo06 · 2023-11-21 20:57:24

You're doing what I've always dreamed of doing It's a bit difficult on Linux, unfortunately. I've had this problem even in windows, I had to unplug the cable of the other monitor (on startup) or switch to the other monitor. I also messed with the BIOS settings, just to give you an idea. If you have a conf file you can try to change KDE settings. You can try a different connection. If there is a 3rd party program, you can try to use it for this. Otherwise, I think the problem might be something like this. When one monitor is scaled more than 100% (150%), it steals from the other one. It might be a bug because the other monitor can't work at 50%.

I have two monitors and I still can't understand why one is clearer and brighter than the other. Same model and brand. Take a look at the xrandr options. I recommend you to consider VDI and other options instead of HDMI or vice verse for others. I have also used a converter due to motherboard incompatibility. Monitor is a bit complicated

Last edited by jojo06 (2023-11-21 20:58:21)

Funny0facer · 2023-11-21 21:11:38

Maybe a bit mean, but what prevents you from switching to a wayland session? Is there a specific app or workflow, that does not yet work for you?

attishno1 · 2023-11-22 02:10:45

Funny0facer wrote:

Maybe a bit mean, but what prevents you from switching to a wayland session? Is there a specific app or workflow, that does not yet work for you?

1. The Godot Engine goes black when any feature that opens up another window on it is accessed. I have to resize Godot for the black windows to reappear. Sometimes they do, sometimes they don't.
2. Unity Engine is extremely blurry and clicks sometimes takes about a second to respond on Wayland. Also resizing anything causes the Engine to go black for about 0.5 seconds.
3. Postman-bin from AUR flickers when using it. Values are not updated sometimes, so debugging can be a problem.
4. The biggest issue is that the inspector in both Godot and Unity do not get updated instantly and that made me believe some of the games that I was developing had bugs. Turns out the variables in the inspector only updated when I resized the windows.

attishno1 · 2023-11-22 02:14:46

jojo06 wrote:

You're doing what I've always dreamed of doing It's a bit difficult on Linux, unfortunately. I've had this problem even in windows, I had to unplug the cable of the other monitor (on startup) or switch to the other monitor. I also messed with the BIOS settings, just to give you an idea. If you have a conf file you can try to change KDE settings. You can try a different connection. If there is a 3rd party program, you can try to use it for this. Otherwise, I think the problem might be something like this. When one monitor is scaled more than 100% (150%), it steals from the other one. It might be a bug because the other monitor can't work at 50%.
I have two monitors and I still can't understand why one is clearer and brighter than the other. Same model and brand. Take a look at the xrandr options. I recommend you to consider VDI and other options instead of HDMI or vice verse for others. I have also used a converter due to motherboard incompatibility. Monitor is a bit complicated

When I turn of K-screen everything works perfectly fine with the resolution of both left and right monitor being 2307x1440 using Nvidia Settings. The problem is, I would like to know whether this is safe or not, as a warning is displayed in the 'Display Settings' of KDE that gaps in monitors are not supported. I have seen glitches due to this sometimes. The programs open up in the middle of two screens sometimes.

Funny0facer · 2023-11-22 17:06:33

okay, so you actually considered it, but had different issues there...
It depends on what you consider "safe". If you can live with the limitations, you already experienced, then sure, this setup might work for you.

If I were you, I would ask the same question at https://discuss.kde.org/

attishno1 · 2023-11-22 17:41:16

Funny0facer wrote:

okay, so you actually considered it, but had different issues there...
It depends on what you consider "safe". If you can live with the limitations, you already experienced, then sure, this setup might work for you.
If I were you, I would ask the same question at https://discuss.kde.org/

Thank you. I will do that!

Arch Linux

#1 2023-11-21 06:09:42

KDE Multi-montor setup + Disabling KScreen

#2 2023-11-21 20:57:24

Re: KDE Multi-montor setup + Disabling KScreen

#3 2023-11-21 21:11:38

Re: KDE Multi-montor setup + Disabling KScreen

#4 2023-11-22 02:10:45

Re: KDE Multi-montor setup + Disabling KScreen

#5 2023-11-22 02:14:46

Re: KDE Multi-montor setup + Disabling KScreen

#6 2023-11-22 17:06:33

Re: KDE Multi-montor setup + Disabling KScreen

#7 2023-11-22 17:41:16

Re: KDE Multi-montor setup + Disabling KScreen

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