Arch Linux

nomeutente94

Member

From: Italy

Registered: 2011-02-21

Posts: 15

Website

Scaling KDE Plasma for only one display in a multi-monitor setup

Hello everyone,

I want to use my laptop with an external monitor via Mini DP out but I can't figure out how to hi-dpi scale only on one screen. I use X Window System. Thank you.

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seth

Member

Registered: 2012-09-03

Posts: 51,149

Re: Scaling KDE Plasma for only one display in a multi-monitor setup

You don't. X11 operates on one logical DPI.
Clients *could* figure which output they appear on and which DPI that has using Xrandr, but none do that (also no way to do that if a client appaears at several outputs at the same time)

You can
1. run the hidpi output on a lower resolution
2. scale up the low resolution output (or down to hidpi one)
3 pick a DPI in the middle (small-ish but usable on the "regular" and big-ish but usable on the hidpi output)

https://wiki.archlinux.org/title/HiDPI# … e_displays

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nomeutente94

Member

From: Italy

Registered: 2011-02-21

Posts: 15

Website

Re: Scaling KDE Plasma for only one display in a multi-monitor setup

Running the hidpi output on a lower resolution is what I am currently doing. Thank you for the infos...

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last.fm.

desaparecido

Member

From: Liège, Belgium

Registered: 2010-03-14

Posts: 155

Re: Scaling KDE Plasma for only one display in a multi-monitor setup

hummm ... even than you use X  server, you could be try Wayland session, because is possible i i remember fine

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csyn

Member

Registered: 2021-08-03

Posts: 1

Re: Scaling KDE Plasma for only one display in a multi-monitor setup

This is what I used way back when.. basically uses xrandr to scale one display separately, and map to the overall desktop at the appropriate point. Not sure if it still works, YMMV. Obviously, output names will vary to your specific setup, as will the resolution numbers.

xrandr --dpi 276 --fb 7040x3960 \
     --output eDP-1 --mode 3200x1800 \
     --output DP-1 --scale 1.5x1.5 --pos 3200x0 --panning 3840x2160+3200+0

ugjka

Member

From: Latvia

Registered: 2014-04-01

Posts: 1,808

Website

Re: Scaling KDE Plasma for only one display in a multi-monitor setup

hummm ... even than you use X  server, you could be try Wayland session, because is possible i i remember fine

https://community.kde.org/Plasma/Wayland_Showstoppers

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