[SOLVED]Kde Dual monitor issues

yuanhao · 2022-04-28 18:50:57

My DE is kde. The graphic driver is the nvidia one. I used to use a single 4k monitor and everything is just perfect, but today I add another 2k monitor, and then it behaves not good, my issues are:

1. I use 150% scaling for 4k and after I connect the new 2k monitor it also scale it 150% for me, but I want the 4k one keeps 150% while 2k one be 100%. There is only a Global scale in system settings so I don't know how to do that.

2. Every time I open the window (regardless of what application), its position and size is really wired, and it does not remember the position and size after I change and close it. This never happened before dual monitors. (There is an "allow apps to remember the positions of their own windows" option in system settings in the "Window behavior" section, but it is no help)

3. (not sure if it is related to dual monitors, but it only appears after I add a new monitor) the NVIDIA X Server Settings rewrite the configuration file (~/.nvidia-settings-rc) on every reboot

Anyone knows how to fix them?

Edit:
Issue 2 seems to be solved partially (magically) by align the primary display to the left most, now it starts to remember the position and size..
Issue 3 just fixed itself, not sure how...

Last edited by yuanhao (2022-05-11 15:19:41)

leonavis · 2022-04-28 19:10:20

For 1: Try setting global on 100% and running xrandr like

xrandr --output [your output] --scale 1.5x1.5

Substituting "your output" with something like "HDMI-1" depending where your 4k monitor is located.

Dunno if that'll work though.

yuanhao · 2022-04-28 19:14:10

leonavis wrote:

For 1: Try setting global on 100% and running xrandr like
xrandr --output [your output] --scale 1.5x1.5
Substituting "your output" with something like "HDMI-1" depending where your 4k monitor is located.
Dunno if that'll work though.

How do I get which output I am using?

leonavis · 2022-04-28 19:19:48

Run xrandr.

yuanhao · 2022-04-28 20:04:47

leonavis wrote:

For 1: Try setting global on 100% and running xrandr like
xrandr --output [your output] --scale 1.5x1.5
Substituting "your output" with something like "HDMI-1" depending where your 4k monitor is located.
Dunno if that'll work though.

It does not work, it shows like this:
https://ibb.co/hgrMtCG

logothete · 2022-05-08 00:55:24

multi-monitor scaling woes, when the monitors are of greatly different resolution, is broadly a problem for the X11 display protocol. The reason there is only a global display setting in system settings isn't KDE specific, so much as one of the drawbacks of X11. See how using the plasma Wayland session goes for you; the Wayland protocol allows different displays to be scaled independently.

Arch Linux

#1 2022-04-28 18:50:57

[SOLVED]Kde Dual monitor issues

#2 2022-04-28 19:10:20

Re: [SOLVED]Kde Dual monitor issues

#3 2022-04-28 19:14:10

Re: [SOLVED]Kde Dual monitor issues

#4 2022-04-28 19:19:48

Re: [SOLVED]Kde Dual monitor issues

#5 2022-04-28 20:04:47

Re: [SOLVED]Kde Dual monitor issues

#6 2022-05-08 00:55:24

Re: [SOLVED]Kde Dual monitor issues

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