Arch Linux

archcry

Member

Registered: 2018-02-23

Posts: 20

Trouble running 5120x1440@120HZ (or more) on XPS15 9500

Hello,

I am running a Odyssey G9 monitor from Samsung. This monitor supports a resolution of 5120x1440 at up to 240hz yet I am struggling to run the display at more than 60hz. I have tried a couple of things in order to find a solution on this problem but unfortunately I did not get the monitor running reliably at more than 60hz. The things I've tried so far:
1. Replacing the usb-c -> dp cable with a usb-c -> DP1.4 cable (1 meter in length)
2. Manually setting the resolution and refresh-rate with xrandr

$ cvt 5120 1440 120
# 5120x1440 119.98 Hz (CVT) hsync: 185.36 kHz; pclk: 1322.75 MHz
Modeline "5120x1440_120.00"  1322.75  5120 5560 6128 7136  1440 1443 1453 1545 -hsync +vsync
$ xrandr --newmode "5120x1440_120.00"  1322.75  5120 5560 6128 7136  1440 1443 1453 1545 -hsync +vsync
$ xrandr --addmode DP-1 5120x1440_120.00
$ xrandr --output DP-1 --mode 5120x1440_120.00
xrandr: Configure crtc 0 failed

3. Using lxrandr to set the resolution and refresh-rate
4. Searching in nvidia-settings for a possible solution (I don't see any mention on resolution or refres-rate in nvidia settings)

All without succes, I did notice that sometimes when you unplug and plug or change the supported refresh-rate in the monitor OSM does change the available refresh-rates in KDE settings and I will be able to run 120Hz until I restart my laptop. This is very unreliable and I haven't been able to reproduce this any time lately.

System:

OS: Arch Linux
Kernel: x86_64 Linux 5.14.12-arch1-1
DE: KDE 5.87.0 / Plasma 5.23.0
CPU: Intel Core i9-10885H @ 16x 5.3GHz
GPU: NVIDIA GeForce GTX 1650 Ti

Last edited by archcry (2021-10-22 09:04:59)