Comment 1 for bug 1234121

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Robert Ancell (robert-ancell) wrote : Re: LightDM does not appear to support alpha transparency

Unfortunately LightDM can't help here - it's just run a standard X server and the greeter inside it. So to support transparent windows either X needs to be informed of this or perhaps this is the function of a window manager (which pantheon greeter will be acting as in this case). Sorry I don't know enough about transparent windows to say where exactly.