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I'm currently running ubuntu with dwm on my macbook air and I have a problem. When I connect to a monitor using a dongle, which converts an HDMI cable to MBA's DP port, xrandr still recognizes it as HDMI.

When I try to connect to it as such it just shows a pure green screen, presumably because it is trying to feed HDMI through a DP port.

That said, usually this isn't a problem. When I use the Gnome displays tool it's able to correctly handle this. So basically my question is, how can I tell xrandr to send DP even though it's convinced that it's connected to HDMI?

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closed as unclear what you're asking by harrymc, slhck Sep 19 '13 at 17:58

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question.If this question can be reworded to fit the rules in the help center, please edit the question.

I don't think this is an xrandr problem, but more to do with the driver or xorg.conf. See similar problems in this thread or this one. – harrymc Sep 10 '13 at 6:47
This would be easier to answer if you showed us the xrandr command you use, the Ubuntu version you're on, the desktop environment you are using, some info on your hardware (I don't want to go look up the mac air) etc etc. – terdon Sep 12 '13 at 22:36
Post seems to have been abandoned. – harrymc Sep 18 '13 at 8:33