How can I figure out if a video driver is loaded in linux?

How can I figure out if a video driver is loaded in linux? I've got a Xubuntu installation on a Dell Latitude C800 and I'm pretty sure I've read that one should set the display depth to only 16bit in order to use the ATI Mobility M4 graphics card.
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Guest [Entry]

"If you know what you're looking for, you can use lsmod to list currently loaded modules.

lsmod is a trivial program which
nicely formats the contents of the
/proc/modules, showing what kernel modules are currently loaded.

Another option is to check X11 logs (/var/log/Xorg.0.log). On my system, this file contains the following line:

(II) LoadModule: ""nvidia"""