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pure_bliss

Member

Registered: 2021-04-17

Posts: 32

[Solved] Xorg configuration refresh rate setup

Hi! I have a "Asus TUF VG249QL3A" monitor, and a "AMD Radeon RX 6700 XT". I want to use it at 165 Hz by default. This works with the "xrandr -s 1920x1080 -r 165" command. However with the following Xorg configuration:

Section "Monitor"
    Identifier      "Monitor0"
    ModelName       "Asus TUF VG249QL3A"
    Modeline        "1920x1080_165.00"  525.00  1920 2088 2296 2672  1080 1083 1088 1192 -hsync +vsync
    Option          "PreferredMode" "1920x1080_165.00"
    Option          "DPMS" "false"
EndSection

Section "Screen"
    Identifier      "Screen0"
    Device          "AMDGraphics"
    Monitor         "Monitor0"
    SubSection      "Display"
        Modes           "1920x1080_165.00"
    EndSubSection
EndSection

Section "Device"
    Identifier      "AMDGraphics"
    Driver          "amdgpu"
    Option          "TearFree" "true"
    Option          "VariableRefresh" "true"
    Option          "UseDisplayDevice" "DisplayPort-0"
EndSection

Startup hangs at "Reached target Graphical Interface". "Modeline" generated using "cvt 1920 1080 165". "gtf" gives slightly different numbers, doesn't work with that either. On a different TTY htop shows Xorg and i3 running.

Xorg log from that boot:  https://bpa.st/F33Q

I would like to ask some help regarding this, I'm not good with Xorg configuration, not sure what I missed even after consulting with google search and chatgpt. Please let me know if any additional information or log is required. Thanks in advance!

Last edited by pure_bliss (2025-01-16 11:31:35)

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 23,897

Re: [Solved] Xorg configuration refresh rate setup

I'd suggest to simplify the config and rely more on autoconfiguration, this should suffice

Section "Monitor"
   Identifier "DisplayPort-0"
   Option    "PreferredMode" "1920x1080_165.00"
   Option    "DPMS" "false"
EndSection

Section "OutputClass"
   Identifier "AMDGraphics"
   MatchDriver "amdgpu"
   Driver "amdgpu"
   Option          "TearFree" "true"
   Option          "VariableRefresh" "true"
EndSection

you might have to adjust the identifier in the Monitor section to the actual identifier as is given by a xrandr -q, it might also be DP-0 instead of written out. Since you're hanging in "graphical target" which graphical target are you trying to reach? A display manager? Which? Or autoboot into i3?

Last edited by V1del (2025-01-10 13:51:54)

pure_bliss

Member

Registered: 2021-04-17

Posts: 32

Re: [Solved] Xorg configuration refresh rate setup

I have SDDM installed, if I understand thing correctly that should be the graphical target

The configuration you suggested gets me to the i3 desktop environment, but with a few errors: https://bpa.st/A4EQ

And with 60 Hz refresh rate:

~ $ xrandr -q                                                                                                                                                           pc
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
DisplayPort-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 527mm x 296mm
   1920x1080     60.00*+ 165.00   120.02    96.04    72.02    60.01    50.00    48.01   143.85   120.00   100.00   119.88    50.00    59.94  
   1680x1050     59.95  
   1280x1024     75.02    60.02  
   1440x900      59.89  
   1280x960      60.00  
   1280x800      60.00  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1440x576      50.00  
   1024x768      75.03    70.07    60.00  
   1440x480      60.00    59.94  
   800x600       72.19    75.00    60.32    56.25  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       75.00    72.81    66.67    60.00    59.94  
   720x400       70.08  
DisplayPort-1 disconnected (normal left inverted right x axis y axis)
DisplayPort-2 disconnected (normal left inverted right x axis y axis)
HDMI-A-0 disconnected (normal left inverted right x axis y axis)

pure_bliss

Member

Registered: 2021-04-17

Posts: 32

Re: [Solved] Xorg configuration refresh rate setup

OK, after a lot of trying stuff out, this works (boots, preferred mode respected, variable refresh works):

/e/X/xorg.conf.d $ cat 20-amdgpu.conf 
Section "Monitor"
    Identifier      "Monitor0"
    ModelName       "Asus TUF VG249QL3A"
    Modeline        "1920x1080_165"  380.96  1920 1968 2032 2080  1080 1083 1088 1110 +hsync -vsync
    Option          "PreferredMode" "1920x1080_165"
    Option          "DPMS" "false"
EndSection

Section "Screen"
    Identifier      "Screen0"
    Device          "AMDGraphics"
    Monitor         "Monitor0"
    SubSection      "Display"
        Modes           "1920x1080_165"
    EndSubSection
EndSection

Section "Device"
    Identifier      "AMDGraphics"
    Driver          "modesetting"
    Option          "TearFree" "true"
    Option          "VariableRefresh" "true"
    Option          "AsyncFlipSecondaries" "false"
    Option          "UseDisplayDevice" "DisplayPort-0"
EndSection

/ $ xrandr
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
DP-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 527mm x 296mm
   1920x1080_165 165.00*+
   1920x1080     60.00 + 165.00   120.02    96.04    72.02    60.01    50.00    48.01   143.85   120.00   100.00   119.88    59.97    59.96    50.00    59.94    59.93  
...

I got the modeline from the Xorg log, after the "Printing probed modes for output DP-1" line. cvt and gtf modelines got me to blank screen. I removed "xf86-video-amdgpu". I replaced "Device" section "Driver" option with "modesetting".

There are some additional settings I'm experimenting with, because when I switch between input sources on my monitor (laptop HDMI, desktop DP) sometimes my desktop decides that it won't give any output. But that's another story, might create a separate post if I can't fix it.