Arch Linux

Zeash

Member

Registered: 2021-01-26

Posts: 71

[SOLVED] 144hz monitor running at only 85hz

Hello,
I'm running Xorg with KDE Plasma on my Samsung 24" Odyssey LC24RG50FQRXEN, which is a 144hz monitor. However, it seems to always run at 85hz/75hz, as seen in:

- Nvidia X Server Settings, where trying to change the refresh rate only allows Auto, 50hz, 60hz and 75hz
- xrandr: which says

Screen 0: minimum 8 x 8, current 3000 x 1920, maximum 32767 x 32767
HDMI-0 connected primary 1920x1080+1080+510 (normal left inverted right x axis y axis) 532mm x 304mm
   1920x1080     60.00*+  84.91    59.94    50.00  
   1680x1050     59.95  
   1600x900      60.00  
   1440x900      59.89  
   1280x1024     75.02    60.02  
   1280x800      59.81  
   1280x720      60.00    59.94    50.00  
   1152x864      75.00  
   1024x768      75.03    70.07    60.00  
   800x600       75.00    72.19    60.32    56.25  
   720x576       50.00  
   720x480       59.94  
   640x480       75.00    72.81    59.94  

- KDE Plasma settings, where I'm offered the choice between 50hz, 60hz and 85hz only.

I've tried using

xrandr --output HDMI-0 --rate 144

but this didn't do anything.
Any help is much appreciated.

Last edited by Zeash (2021-05-25 08:28:56)

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 25,230

Re: [SOLVED] 144hz monitor running at only 85hz

Have you tested this anywhere else? A lot of this can be dependent on your HDMI cable, if it's not the correct "version" of HDMI you won't get the full range: https://en.wikipedia.org/wiki/HDMI#Refr … dard_video

Which exact nvidia card?

Zeash

Member

Registered: 2021-01-26

Posts: 71

Re: [SOLVED] 144hz monitor running at only 85hz

I've tried using the original cable that came with the monitor, and unless Samsung is so incompetent as to include an obsolete cable, it's clear that it's not cable related. I wasn't able to find out the exact version though, it isn't written anywhere in the documentation.

Zeash

Member

Registered: 2021-01-26

Posts: 71

Re: [SOLVED] 144hz monitor running at only 85hz

For some reason FreeSync was on (I use an nvidia gpu) which limited the refresh rate. After turning it off I'm now able to set the full 144hz.