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http://freedesktop.org/bugzilla/show_bug.cgi?id=760   
   
           Summary: severe flickering with rendering on root window
           Product: DRI
           Version: DRI CVS
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: General
        AssignedTo: [EMAIL PROTECTED]
        ReportedBy: [EMAIL PROTECTED]


Attempting to run a DRI accelerated rendering with the radeon and rv200 drivers,
on the root window, leads to severe flickering. [Perhaps double buffering is not
active? But this flickering seems to be somewhat Z-dependent... Within the
flickering, you can sometimes see things being drawn that should be occluded by
other objects]].

To replicate the problem:
Use, say, one of the gl xscreensavers, [located in /usr/X11R6/lib/xscreensavers
on my distribution]

such as:
./superquadrics -root

And the problem will be quite apparant. 
This only happens when openGL applications are run on the root window. 

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