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#1 2022-12-27 10:39:16

Registered: 2022-12-27
Posts: 1

Xfce and xrandr without Monitor, resolution not change

Hi, I have a small TV box where I managed to put Armbian with Xfce desktop environment. I use it without Display connected and some times to monitor what it is doing I use vnc.
The resolution when I connect to the display :0 is very small, to get around this in other desktop environments (e.g. lxde) I used to use the command xrandr --fb 1280x720 and everything was resized.
On Xfce if I try to give this command the screen enlarges but the effective working area remains the same and most of the display remains black. I did not understand if it is the windows manager or something else that is not refresh and how it could be solved. Any solution?


#2 2023-01-18 22:01:32

From: Czech Republic
Registered: 2022-07-27
Posts: 14

Re: Xfce and xrandr without Monitor, resolution not change

So you always run it in headless mode? Then way i use is via dummy video "card":

1. Install package:

sudo apt install xserver-xorg-video-dummy

2. With your favorite editor running via sudo create file "/etc/X11/xorg.conf" with:

Section "Monitor"
    Identifier "Monitor0"
    HorizSync 28.0-80.0
    VertRefresh 48.0-75.0
    Modeline "1920x1080_60.00" 173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync
    Modeline "1920x1200_60.00" 193.25 1920 2056 2256 2592 1200 1203 1209 1245 -hsync +vsync
Section "Device"
    Identifier "Card0"
    Driver "dummy"
    VideoRam 256000
Section "Screen"
    Identifier "Screen0"
    DefaultDepth 24
    Device "Card0"
    Monitor "Monitor0"
    SubSection "Display"
        Depth 24
        Modes "1920x1200" "1920x1080"

3. Restart Display Manager:

sudo systemctl restart lightdm

and for adding other resolutions, you can generate modeline (and manualy add it to xorg.conf) using:

cvt 1280 720


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