How to set alpha blending for gdm greeter?

Bruno Wolff III bruno at
Tue Nov 15 16:36:21 UTC 2011

With F16 the gdm login window started using alpha blending. However recently
on a couple of my machines I am not seeing that any more and would like to
turn it back on. I haven't been able to figure out what the setting is to
do that.

Does anyone know where this is controlled?

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