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Old 02-22-2019, 05:00 PM   #1
EverydayDiesel
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Getting Monitor To Show 4k @ 60hz with MST=Off


Hello,

I am trying to get my monitor (really a tv) to show in 3840x2160 at 60 hz but currently can only get 30hz. Not that it really matters but windows was able to get this resolution so I know the hardware can support it.

I found this where a person said to 'SET MST=Off' but I am unsure how to do this
https://www.reddit.com/r/linux/comme...60hz_in_linux/

Code:
$ set MST=Off

***REBOOTED***

$ xrandr
Screen 0: minimum 320 x 200, current 3840 x 2160, maximum 16384 x 16384
DVI-I-1 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
HDMI-1 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis) 1872mm x 1053mm
   4096x2160     30.00    25.00    24.00    29.97    23.98  
   3840x2160     30.00*   25.00    24.00    29.97    23.98  
   1920x1080     60.00    50.00    59.94    30.00    25.00    24.00    29.97    23.98  
   1920x1080i    60.00    50.00    59.94  
   1680x1050     59.88  
   1600x900      60.00  
   1280x1024     75.02    60.02  
   1440x900      59.90  
   1366x768      59.79  
   1280x800      59.91  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1024x768      75.03    70.07    60.00  
   832x624       74.55  
   800x600       72.19    75.00    60.32  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       75.00    72.81    66.67    60.00    59.94  
   720x400       70.08  
DP-3 disconnected (normal left inverted right x axis y axis)
How exactly do I set MST=off and or check to make sure it is saved?
 
Old 02-23-2019, 01:11 AM   #2
ondoho
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apparently (*) it's a setting of the monitor itself, not the computer.

(*) according to the reddit article

Last edited by ondoho; 02-26-2019 at 12:37 AM. Reason: added (*)
 
Old 02-25-2019, 03:24 PM   #3
business_kid
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Xrandr is a bit primitive and I for one never got much good out of it except feedback.

3840x2160 is just the visible part. For historical reasons, there's a left, right, top & bottom INVISIBLE portion of the scan line. Look in /var/log/Xorg.0.log to see what it says.

You may have to try a Modeline in /etc/X11/xorg.conf.d/numbers-filename.conf
Usually the numbers are 00-99, the filename is the old xorg.conf section name.
Man xorg.conf is alive and well. Use it. If you can't find a 4k modeline, look for a hdmi modeline and double it. Here's one from Ubuntu verbiage. Double the figures I have in bold.
Code:
Section "Monitor"
        Identifier      "MonitorTMDS1"
        ...
        Modeline        "1920x1080@60hz"    148.352  1920 1960 2016 2200  1080 1082 1088 1125  +hsync +vsync
        Option          "IgnoreEDID"        "true"
        Option          "PreferredMode"     "1920x1080@60hz"
EndSection
 
  


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