Find Graphics Card/Driver Details

You can use glxinfo (form the meta-utils package) for information about your driver and OpenGL.
Run

glxinfo | grep OpenGL

for info about your driver and OpenGL.

You can use lspci for info about your PCI devices (so, VGA too).
Use

lspci -v -s `lspci | awk '/VGA/{print $1}'`

for info about you video card.

Follow System Settings - Software & Updates - Additional Drivers