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I try to change the external monitor refresh rate for my IIYAMA PROLITE X4071UHSU-B1 Monitor on a XNG p406 Laptop. I'm using the internal Intel GPU.

xrandr gives me:

eDP1 connected primary 1920x1080+0+961 (normal left inverted right x axis y axis) 309mm x 174mm
   1920x1080     60.02*+  59.93  
   1680x1050     59.95    59.88  
   1600x1024     60.17  
   1400x1050     59.98  
   1600x900      60.00  
   (...)

DP1 connected 3840x2160+1920+0 (normal left inverted right x axis y axis) 878mm x 485mm
   3840x2160     60.00 +  30.00*   29.97  
   1920x2160     60.00  
   2560x1440     59.95  
   2048x1152     60.00 
   (...) 

So, 60Hz should be available, but is not used.

So I try to switch to 60 hz with xrandr --output DP1 --rate 60. But nothing happens. No output in the console, no flickering or something. And xrandr gives the same output like above.

Am I doing something wrong?

My Ubuntu: 16.04 With 4.7.2-040702-generic kernel

  • How is the monitor connected - HDMI or DisplayPort? If you're using HDMI there might be a chance that the cable (and the port of your GPU) must be at least version 2.0. At least that's what big screen TV's require to display 4K at 60Hz – Sledge Hammer Nov 18 '16 at 14:58
  • It`s connected to the mini display port... – user1383029 Nov 18 '16 at 15:10
  • Run cat ~/.config/monitors.xml and see the specific monitor. What is the rate for that monitor in that file? For example <rate>60</rate> – jiipeezz Nov 18 '16 at 15:19
  • Ok, it was set to 30 in that file. I changed it to 60. Now it works, thank you! – user1383029 Nov 18 '16 at 16:20
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jiipeezz pointed me to the right direction: I edited the file ~/.config/monitors.xml with the command sudo gedit ~/.config/monitors.xml and changed <rate>30</rate> to <rate>60</rate> and rebooted. Now it works, xrandr output is:

DP1 connected 3840x2160+1920+0 (normal left inverted right x axis y axis) 878mm x 485mm
   3840x2160     60.00*+  30.00    29.97  
   1920x2160     60.00  
   2560x1440     59.95 

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