* [[https://www.howtogeek.com/658701/tn-vs.-ips-vs.-va-whats-the-best-display-panel-technology/|TN vs IPS vs VA screens]]

===== Create a virtual display in Linux =====
//this is useful if using something like, for example [[https://deskreen.com/lang-en|Deskreen]] to mirror a secondary display on another device such an iPad when no other physical secondary display exists. [[https://github.com/augustoicaro/Immersed-Linux-Virtual-Monitors|original source]]//
  * Extensible Virtual Display Interface (EVDI) module: ''sudo apt install evdi-dkms''
  * load module: ''sudo modprobe evdi initial_device_count=4''
  * now if you do ''xrandr'' you'll see some virtual DVI ports available. Choose one to be your enabled port. For this example we'll choose ''DVI-I-2-1'' with format DVI-I-x-y e.g. x=2 y=1
  * add resolutions as you need:
    * existing resolution: ''xrandr --addmode DVI-I-2-1 "1920x1080"''
    * create a resolution. Example: 2048x1536:
      * ''cvt 2048 1536'' will return ''Modeline "2048x1536_60.00"  267.25  2048 2208 2424 2800  1536 1539 1543 1592 -hsync +vsync''
      * then do: ''xrandr --newmode 2048x1536_60.00"  267.25  2048 2208 2424 2800  1536 1539 1543 1592 -hsync +vsync''
  * force virtual port as connected: ''sudo sh -c "echo on > /sys/kernel/debug/dri/2/DVI-I-1/force"'' //note x=2 y=1 in this example//
  * From here use the standard display tools (GUI or otherwise) to set the monitor position etc.
    * on trixie (Debian 13.3) standard display tools didn't work. Instead: ''xrandr --output DVI-I-2-2 --mode 1920x1080 --pos 1920x0'' (or similar)

===== Sunshine =====
//Sunshine can run on the host machine to show the virtual display on another machine//
  * install with flatpak
  * there appears to be no way to accept the pairing request from the KDE notification. Instead, before attempting to pair in Moonlight:
    * go to Sunshine UI at ''localhost:47990/'' and log in
    * in the menu choose ''PIN'' 
  * you may need to choose the virtual display in the configuration
    * find the display ID in the terminal output. It will look something like: ''[2026-06-09 09:30:24.680]: Info: Detected display: DVI-I-3-2 (id: 4)DVI-I-3-2 connected: true''
    * in ''Configuration'' -> ''Audio/Video'' enter the ID in ''Display ID'' box
  * if you forget the password, from the terminal reset it: ''flatpak run dev.lizardbyte.app.Sunshine --creds [username] [password]''
===== Moonlight =====
  * run Moonlight on the machine which will be the secondard monitor
  * under Moonlight settings shut off on-screen controls and set a custom resolution.