[Bug 37127] i915 DRI driver seems to get the z-buffer backward

[Steve Kowalik]

Public bug reported:
https://launchpad.net/malone/bugs/37127

Affects: linux-source-2.6.15 (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed

Description:
The i915 DRI driver seems to render objects in the reverse order - but
only when fullscreen. Using GL in a window, everything looks perfect.
Switch to a GL screensaver, and everything looks like a mess, since the
z-buffer is backward.