Install video driver
Before you install a video driver, you need to have a knowledge of which driver you need.
To know which video chipset your machine has, run
| $ lspci | grep VGA |
lspci program is available under /usr/sbin/lspci.
For a complete list of all open-source video drivers, search the package database:
| $ pacman -Ss xf86-video | less |
I installed xf86-video-intel-sna as I used intel motherboard with integrated graphics controller.
If you are using NVIDIA, ATI or any other graphics cards, look for information here