Comment 3 for bug 164125

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Bryce Harrington (bryce) wrote : Re: fglrx doesn't support xrandr

This may be because ATI has not implemented xrandr 1.2 in fglrx. xrandr 1.0options like -s and -v should work fine but others will not. I suspect -q requires some 1.2 functionality. I'm reassigning this bug accordingly.

Jonathan, since you're using -intel hardware, your issue is not identical, but probably is broken for the same reason - xgl probably doesn't support xrandr 1.2 commands. Please file a new bug about this against xserver-xgl.