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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.

Is there a possibility to see if the graphics card has been loaded with the correct drivers?

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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"
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  • further that logfile should tell you exactly how X configured the display, so you can tell the bitdepth -- look for a line like "(--) Depth 24 pixmap format is 32 bpp"
    – quack quixote
    Oct 8, 2009 at 19:24

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