[KDE/nVidia]-Have Different DPI For One Display When Using Dual Cloned Displays?

Support Graphics & Display
1

Hi,

Running Manjaro KDE 64Bit fully updated with an nVidia GPU and proprietary nVidia Linux drivers.
I have two displays now connected to the GPU with mirroring enabled.
Is there any way to increase the DPI on only one display?
Let me know, thanks!

Jesse

2

Hi,

I don’t think the above is currently possible.

I would not mind changing the display scale temporarily when using the other display,
but it requires me to close all applications and log out and log back in?

Jesse

3

Hi,

Did some more searching:

Found:
https://wiki.archlinux.org/title/HiDPI#Multiple_external_monitors
But am unsure how to implement and don’t know if it will even work?

Basically I want to scale (150%) only one of two displays under KDE.
(one DVI monitor and one HDMI television - both attached to an nVidia GPU)

Let me know, thanks!

Jesse

4

Run xrandr to find your outputs. You may want to specify where you want each monitor like in the wiki.

xrandr --output <output> --scale 1x1  # 100%
xrandr --output <output> --scale 0.75x0.75 # I think it's either 125% or 150%
xrandr --output <output> --scale 0.5x0.5 # 200%

If you need help, post the output of xrandr. :slight_smile:

Have you tried changing resolution instead?

5

[jlp@SortaFastDesktop ~]$ xrandr
Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 32767 x 32767
DVI-D-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 527mm x 296mm
1920x1080 60.00*+
1680x1050 59.95
1440x900 59.89
1280x1024 60.02
1280x800 59.81
1280x720 60.00
1152x864 75.00
1024x768 70.07 60.00
800x600 60.32 56.25
640x480 59.94
HDMI-0 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 1600mm x 900mm
3840x2160 30.00 + 59.94 50.00 29.97 25.00 23.98 23.98
4096x2160 59.94 50.00 29.97 25.00 24.00 23.98
1920x1080 119.88 100.00 60.00* 59.94 50.00 29.97 25.00 23.98 60.00 50.04
1360x768 60.02
1280x1024 60.02
1280x720 59.94 50.00
1152x864 60.00
1024x768 60.00
800x600 60.32
720x576 50.00
720x480 59.94
640x480 59.95 59.94 59.93
DP-0 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
[jlp@SortaFastDesktop ~]$

6

Sorry should’ve asked before.

What are you trying to do exactly?
What resolutions do you want to use?

# Assuming you want the resolutions you're currently using.
# This will make things larger, much like changing
# to a smaller resolution
# I put both since I don't know which one you want.
xrandr --output HDMI-0 --scale 0.75x0.75  
xrandr --output DVI-D-0 --scale 0.75x0.75  
# to reset change the scale to 1x1

# If you want to match 4k and 1080p
xrandr --output HDMI-0 --mode 3840x2160 --output DVI-D-0 --scale 2x2
# OR
xrandr --output HDMI-0 --scale 0.5x0.5 --mode 3840x2160
# to reset change the scale to 1x1 and the mode to 1920x1080

If anything funky happens and you can’t fix it, logout/reboot.

7

Hi,

Would it be possible to have HDMI scaled differently than the DVI?
Would want HDMI to be made larger while keeping DVI normal.
Let me know, thanks!

Jesse

8

Hi,

It does not work:
Typing: “xrandr --output HDMI-0 --scale 0.75x0.75” in terminal zooms in HDMI TV display,
but the screen is cut off on the bottom and right?

Any ideas?

Jesse

9

I missed it since the window I had open scales correctly, and I only checked my top panel which also scales correctly. Bottom panel is off screen.

So stuff looks the same size on 3840x2160? If so then try the bottom 2 commands from my post above.

So stuff on HDMI looks bigger at 1920x1080?

Use a top panel. :grin:

Did I mention trying a lower resolution?

Wayland?