> OpenGL applications successfully use DRI, e.g. glxgears gets 628 fps vs.
> 220 fps without DRI.  I added /dev/dri/card0 to /etc/logindevperm, so xdm
> would chown-chmod the device to $USER 600 at login, and root 600 when the
> session ends.  Users can log in, but when they log out the system
> freezes: the screen goes black, you can't switch VTs, and the Magic SysRq
> Key has no effect.  The failure occurs if and only if that line is present
> in /etc/logindevperm.

Unless I am mistaken, the short answer is don't do that.  /dev/dri/card0 is
only directly accessed by the X server, which runs with root permissions.
So, you shouldn't ever need to do such a thing.

-- 
Tell that to the Marines!

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