trident is the open source graphics drivers for Trident graphics cards.
You need to activate the following kernel options:
Unknown IRQ microcode needed for Trident graphics support at this time, since the Kernel driver (tridentfb) should support most functions for Trident cards. Unknown KMS details (may not work without it?).
Make sure firmware for your model (check available ones in /lib/firmware/trident) is included in kernel:
Below is a list of the firmware files needed for each family of cards:
No known firmware files are needed for any particular Trident card at this time.
Portage uses the variable VIDEO_CARDS for enabling support for various graphics cards in packages. Setting VIDEO_CARDS to trident will pull in the correct driver:
After setting this you want to update your system so the changes take effect:
If you have the USE flag acl enabled globally and are using ConsoleKit (i.e you're using a Desktop profile) permissions to video cards will be handled automatically. You can check the permissions using getfacl:
A broader solution is to add the user you want to be able to access the video card to the video group:
Note that you will still be able to run X without permission to the DRI subsystem, but usually not with acceleration enabled.
The X server is designed to work out-of-the-box, with no need to manually edit X.Org's configuration files. It should detect and configure devices such as displays, keyboards, and mice.
However, the main configuration file of the X server is the xorg.conf.
You can force the X server to use desired driver with:
Framebuffer (GRUB or LILO)
Full Documentation can be found under /usr/src/linux/Documentation/fb/tridentfb.txt.