$ grep -B2 'Module class: X.Org Video Driver' /var/log/Xorg.0.log
[    15.791] (II) Module intel: vendor="X.Org Foundation"
[    15.791] 	compiled for 1.12.3, module version = 2.19.0
[    15.791] 	Module class: X.Org Video Driver
--
[    15.792] (II) Module vesa: vendor="X.Org Foundation"
[    15.792] 	compiled for 1.12.1, module version = 2.3.1
[    15.792] 	Module class: X.Org Video Driver