Linux-Config-Manual

Display Configuration

$ ps -e | grep Xorg

chack if xrandr is installed

$ xrandr
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
HDMI-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 410mm x 230mm
   1366x768      59.79 +
   1920x1080     60.00*   59.94
   1280x1024     75.02
   1280x720      60.00    50.00    59.94
   1024x768      75.03    60.00
   800x600       75.00    60.32
   720x576       50.00
   720x576i      50.00
   720x480       60.00    59.94
   720x480i      60.00    59.94
   640x480       75.00    60.00    59.94
   720x400       70.08
DP-1 disconnected (normal left inverted right x axis y axis)

$ xrandr --output HDMI-1 --mode 1920x1080

$ touch .xprofile .profile .xinitrc

$ echo "#!/bin/bash" >> .profile .xprofile .xinitric
$ echo "xrandr --output HDMI-1 --mode 1920x1080" >> .profile .xprofile .xinitric

$ touch /etc/X11/xorg.conf.d/10-monitor.conf

paste in /etc/X11/xorg.conf.d/10-monitor.conf

Section "Monitor"
    Identifier    "HDMI1" 
    Option        "PreferredMode" "1920x1080"
    Option        "TargetRefresh" "60"
    Option        "Position" "0 0"
    Option        "Enable" "true"
EndSection 

gdm 1920x1080

sudo cp ~/.config/monitors.xml /var/lib/gdm/.config/monitors.xml 

also add https://linuxreviews.org/HOWTO_fix_screen_tearing#:~:text=Intel%20iGPUs%5B,if%20it%27s%20new. also help full https://askubuntu.com/questions/1347160/screen-tearing-when-using-xrandr-and-x11vnc-on-ubuntu-20-04 , https://christitus.com/fix-screen-tearing-linux/

sudo vim /etc/X11/xorg.conf.d/20-intel-gpu.conf

paste this in there to find out the driver use: grep drivers /var/log/Xorg.0.log

Section "Device"
   Identifier  "Intel Graphics"
   Driver      "intel"
   Option      "TearFree"  "true"
EndSection

OR

Section "Device"
   Identifier  "Intel Graphics"
   Driver      "modesettings"
   Option      "TripleBuffer" "true"
   Option      "TearFree"  "true"
EndSection

After doing all that just

sudo reboot

Install

$ sudo <packet_manager> install arandr
e.g
   sudo apt install arandr
   sudo dnf install arandr
   sudo pacman -Ss arandr

Supported

Debian, Ubuntu, Fedora, CentOS, ...

or use https://github.com/phillipberndt/autorandr

Screen saver

You can disable the screen saver feature with:

sudo systemctl mask suspend.target && sudo systemctl mask sleep.target

GTK - Theme problems

$ touch $HOME/.gtkrc-2.0 $HOME/.config/gtk-3.0/settings.ini

paste in $HOME/.gtkrc-2.0

gtk-icon-theme-name = "Adwaita"
gtk-theme-name = "Adwaita"
gtk-font-name = "DejaVu Sans 11"

paste in $HOME/.config/gtk-3.0/settings.ini

[Settings]
gtk-icon-theme-name = Adwaita
gtk-theme-name = Adwaita
gtk-font-name = DejaVu Sans 11
gtk-application-prefer-dark-theme = true

other themes https://github.com/catppuccin/gtk

more details in https://wiki.archlinux.org/index.php/GTK#Dark_theme_variant

How to find a class of an application

https://unix.stackexchange.com/questions/96798/i3wm-start-applications-on-specific-workspaces-when-i3-starts#:~:text=%40Lu%C3%ADsdeSousa%20you-,xprop%20%7C%20grep%20CLASS,-in%20terminal%2C%20your