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Please, this question has not been answered, I have read them all and none seems to work for me.

I have a headless system Ubuntu 20.04 with Advanced Micro Devices, Inc. [AMD/ATI] Richland [Radeon HD 8570D]

and I have installed the

sudo apt-get install xserver-xorg-video-dummy

with changes to the xorg.conf

I am stuck with max resolution of 1360x768

Any ideas how to get higher resolution?

Marc Vanhoomissen
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stevem0
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  • Possible: https://askubuntu.com/questions/453109/add-fake-display-when-no-monitor-is-plugged-in/713768#comment1555075_713768 – Terrance Dec 15 '20 at 02:24
  • This might help the discussion. The link suggests the solution:

    $xrandr --fb 1600x900

    It gives me the following:

    xrandr: Failed to get size of gamma for output default xrandr: screen cannot be larger than 1360x768 (desired size 1600x900)

     – stevem0 Dec 15 '20 at 15:42
  • https://pastebin.com/HmqnyEud – stevem0 Dec 15 '20 at 15:48

1 Answers1

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after installing xserver-xorg-video-dummy with the command

sudo apt install -y xserver-xorg-video-dummy

paste the high res configuration into the file 20-dummy.conf

sudo cat > /usr/share/X11/xorg.conf.d/20-dummy.conf

following content:

Section "Device"
    Identifier "DummyDevice"
    Driver "dummy"
    VideoRam 1024000
EndSection

Section "Screen"
    Identifier "DummyScreen"
    Device "DummyDevice"
    Monitor "DummyMonitor"
    DefaultDepth 24
    SubSection "Display"
        Depth 24
        Modes "2560x1440_60.0"
    EndSubSection
EndSection


Section "Monitor"
    Identifier "DummyMonitor"
    HorizSync 30-200
    VertRefresh 50-1000
    Modeline "2560x1440_60.00"  312.25  2560 2752 3024 3488  1440 1443 1448 1493 -hsync +vsync
EndSection

if you need another resolution, call the calculate VESA CVT mode lines:

cvt 2048 1440

then copy over cvt 2048 1440 generated string into the 20-dummy.conf file

# 2048x1440 59.97 Hz (CVT) hsync: 89.53 kHz; pclk: 249.25 MHz
Modeline "2048x1440_60.00"  249.25  2048 2200 2416 2784  1440 1443 1453 1493 -hsync +vsync

update the same resolution mode name "2048x1440_60.00" in the SubSection "Display"

and reboot

Oleg Kokorin
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