I have a machine which uses i810 video. I set the VideoRam parameter to
16384 and the X screen depth to 16 bits by editing xorg.conf and that
allowed me to enable DRI.

To make doing that easier, the "Screens and Graphics" applet should be
modified to allow the user to set the screen depth (and possibly
VideoRam parameter too). Editing xorg.conf is not very user-friendly.
Plus it's a real hassle to switch between 16- and 24-bit.

Apart from DRI, there are other reasons for wanting a 16-bit desktop. It
is faster and uses less memory bandwidth. i810 systems are memory-
bandwidth-constrained anyway, so reducing bandwidth helps overall system
speed.

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No direct rendering by default with i810/i815 video
https://bugs.launchpad.net/bugs/68607
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