Bug 441488

SUMMARY
I prefer DP interfaces, but the lack of large monitors with high frequency made me buy 55" LG OLED55C11, supports 120hz refresh rate, but lack any DP. So I bought DP to HDMI adapters:

https://www.amazon.com/CLUB-3D-CAC-1082-Active-Adapter/dp/B07HNTNTMR

https://www.amazon.com/Club-3D-DisplayPort1-4-Adapter-CAC-1085/dp/B08BX49V5V  for the second one I don't have USB-C port A power yet, waiting for additional pci-express card, it displays, but maybe lack enough power, don't know.

problem is that screen only shows 60hz available and it reflects xrandr which reports:

So even with new DP cable used with Club3D dp-to-hdmi convertor it still shows 60hz only at 4k:

[08:14:14] zangetsu@andromeda  $  ~  xrandr
Screen 0: minimum 8 x 8, current 3840 x 2160, maximum 32767 x 32767
DP-0 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis) 1600mm x 900mm
   3840x2160     60.00*+  59.94    50.00    29.97    25.00    23.98  
   4096x2160     59.94    50.00    29.97    25.00    24.00    23.98  
   2560x1440    120.00  
   1920x1080    119.88   100.00    60.00    59.94    50.00    29.97    25.00    23.98  
   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-1 disconnected (normal left inverted right x axis y axis)
HDMI-0 disconnected (normal left inverted right x axis y axis)

So I would like to ask in this request to support high refresh rates supported by adapter. The adapter works in Windows 10 Pro showing 120hz/4k

I use it with nvidia 1030 gt which has one do and one hdmi.