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# apt-get install
sudo apt-get update
# For ubuntu 14.04
sudo apt-get install -y xserver-xorg-video-dummy-lts-trusty
# For ubuntu 16.04
sudo apt-get install -y xserver-xorg-video-dummy-lts-willy
# Copy the xorg.conf to `/etc/X11/xorg.conf`.
wget -P /etc/X11 https://gist.githubusercontent.com/mangoliou/ba126832f2fb8f86cc5b956355346038/raw/b6ad063711226fdd6413189ad905943750d64fd8/xorg.conf
# Restart Ubuntu. The resolution will be 1920x1080.
# Export XAUTHORITY
export XAUTHORITY=/home/admin/.Xauthority
# Or
export XAUTHORITY=/var/run/lightdm/root/:0
# Query the reoslution.
xrandr -d :0 -q
# Change resolution in terminal.
xrandr -d :0 --output default --mode 1280x960
# The resolution will be 1280x960 without resarting Ubuntu.
@mangoliou

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mangoliou commented May 6, 2016

@grug84

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grug84 commented Oct 8, 2018

For ubuntu 16.04

sudo apt-get install -y xserver-xorg-video-dummy-lts-wily
It should be with one l

@Honghe

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Honghe commented Dec 19, 2018

How to deal with the original xorg.conf generated by Nvidia?

cat /etc/X11/xorg.conf

# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig:  version 410.78

Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0"
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
EndSection

Section "Files"
EndSection

Section "InputDevice"
    # generated from default
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/psaux"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
    # generated from default
    Identifier     "Keyboard0"
    Driver         "kbd"
EndSection

Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Unknown"
    HorizSync       28.0 - 33.0
    VertRefresh     43.0 - 72.0
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection
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