X11 & Displays

Question 1

RandR

Answer 1

Dynamic resizing of root window, refresh rate, mirroring, etc.

Question 2

GLX

Answer 2

Provides rendering of 3D OpenGL content in windows.

Question 3

Xinerama

Answer 3

Split desktop display across multiple monitors.

Question 4

X-server main config

Answer 4

/etc/x11/xorg.conf

/etc/x11/xorg.conf.d/

Question 5

X11 configuration anatomy

Answer 5

Server Layout: combine input and output devices in session

Question 6

Input Device

Answer 6

Defines keyboard for input, gets identifier and kernel module for Hardware

Question 7

Device

Answer 7

GPU used, driver to be used.

Question 8

Screen

Answer 8

GPU+monitor

Question 9

X (xorg)

Answer 9

Create new configuration file for X server.

Question 10

X -configure

Answer 10

To try, should have black screen

Question 11

X cursor

Answer 11

Ctrl+Alt+Backspace to quit

Question 12

xdpyinfo

Answer 12

Displays info on X session and X server instance. env, version, extensions available, screen count, dimensions, dpi, color depth.

Question 13

xhost

Answer 13

Older, insecure allowing client systems to display remote X11 windows.
xhost +: no access control
xhost -: access control
xhost + : add IP address.

Question 14

xauth

Answer 14

edit & view security info, grants user ability to control remote X11 client windows.
list: shows remote sessions running.

Question 15

VNC

Answer 15

Virtual network computing: insecure by default

Question 16

VNC configuration

Answer 16

When installed to /etc/systemd/system/ , provides unique number.
Ex: vncserver@:1.service
Modifies
vncpasswd: sets password, service will not start without password.
Systemctl daemon-reload
Systemctl start vncserver@:1
Systemctl enable vncserver@:1