This is very likely to be a bug in the newer version of your driver, the kernel or mesa. Please reassign it to the appropriate xserver-xorg-video package and set the affects to warzone2100.
I imagine a debugging session in #debian-x or the appropriate upstream IRC channel will be needed to figure this issue out. It would be very much worth installing some other OpenGL games/packages and trying them to see if any others have the same issue. Here is a bug that looks similar that might have hints about what workarounds might be available: https://bugs.launchpad.net/ubuntu/+source/warzone2100/+bug/374531 The obvious workaround to try would be to disable KMS and downgrade to testing instead of unstable, IIRC the X stack hasn't migrated to testing since before lenny was released. -- bye, pabs http://wiki.debian.org/PaulWise
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