Can't Get 4k Resolution with 144hz on Ubuntu

Graphics / Linux Linux
1

Installed Ubuntu 22.04.2 today. Having trouble while enabling 144hz on 4k resolution. Everything works as expected on Windows side. (4k@120hz)

My driver is 525.116.04.
Monitor is Dell G3223Q

I can see 144hz on display settings on 4k, but when I choose it, screen goes blank and monitor turns itself off by saying “No signal from source”. After 15 secs, screen comes back with resetted into 60hz.

 xrandr
Screen 0: minimum 8 x 8, current 5120 x 2880, maximum 32767 x 32767
DP-0 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-0 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)
HDMI-1 connected primary 5120x2880+0+0 (normal left inverted right x axis y axis) 708mm x 399mm
   3840x2160     60.00*+ 143.96   119.88   119.88   100.00    59.94    50.00    29.97    25.00    23.98  
   2560x1440    143.97   120.00    59.95  
   1920x1200     59.88  
   1920x1080    143.98   119.98   119.88    60.00    59.94    50.00    29.97  
   1680x1050     59.95  
   1600x1200     60.00  
   1600x900      60.00  
   1280x1024     75.02    60.02  
   1280x800      59.81  
   1280x720      59.94    50.00  
   1152x864      75.00  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   720x576       50.00  
   720x480       59.94  
   640x480       75.00    59.94    59.93  
DP-4 disconnected (normal left inverted right x axis y axis)
DP-5 disconnected (normal left inverted right x axis y axis)
  3840x2160_143.96 (0x234) 1250.000MHz +HSync -VSync
        h: width  3840 start 4200 end 4632 total 5424 skew    0 clock 230.46KHz
        v: height 2160 start 2161 end 2164 total 2347           clock  98.19Hz

The last mode line added by me, can’t use it for HDMI-1.

1 Like
2

Same here, RTX 4090, LG C2 42", tried multiple distros over months and always latest driver, high pixel clock fix from 535 didn’t do anything for me. Going above 4k60hz works only randomly. Works fine on Windows, problem persists on Linux. Tried turning off gsync too on TV, nothing. Xorg / Wayland, KDE / GNOME, no difference.

3

@mcsy_nvidiaforums seems like HDMI2.1 not fully supported on Linux yet.

I changed my connection to DP. Had some issues on Windows, but there was an DP vBios update on manufacturer website, did it. Now everything works as expected.

1 Like
4

I figured it was something like that. Shame that LG OLED TV owners won’t have the option to change to DP without using active adapter that doesn’t support GSYNC.

5

Hello,
I have the same problem with two twin 4k screens on an RTX3060 and ubuntu 20.04.2. I put a single screen and a DP cable but it doesn’t solve anything. My resolution is 1024 instead of 4K, even with only one screen connected.
Can you help me?

Best regards

7

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