[alex.ba]

Hi Fritsch,

thanks. So here is what did work on Ubuntu Desktop:

Code:

gtf 3850 2160 50

Output:

Code:

3840x2160 @ 50.00 Hz (GTF) hsync: 111.10 kHz; pclk: 586.61 MHz
  Modeline "3840x2160_50.00"  586.61  3840 4136 4560 5280  2160 2161 2164 2222  -HSync +Vsync

Code:

xrandr --newmode "3840x2160_50.00"  586.61  3840 4136 4560 5280  2160 2161 2164 2222  -HSync +Vsync

Code:

xrandr --addmode DP-1 3840x2160_50.00

And finally with

Code:

xrandr --output DP-1 --mode 3840x2160_50.00

it switched to the 50Hz.

I did not find an xorg.conf in /etx/X11. Do I have to initiate that first?

Thanks

Alex