4 Replies Latest reply: Dec 17, 2009 5:51 PM by Jeff Greenberg
Bradley Dichter Level 1 Level 1 (40 points)
Supposedly you can connect a video source to the MDP port, rather opposite of it's traditional use on older models. I see no option in System Preferences - displays that mentions switching to this new input. Does the Mac auto sense a signal here and switch to in automatically? Does the manufacturers of MDP to HDMI adapters have anything to say if their devices work bidirectionally? And if they do support joined audio over HDMI like some do, then again do they do that bidirectionally. Of course this is a Apple forum and Apple moderators can't speak about 3rd party products, but they could tell us how video in would work from either a setup TV tuner box or a blu-ray player.

iMac 27", Mac OS X (10.6.1)
  • Dah•veed Level 7 Level 7 (32,650 points)
    This is a user to user forum. There is no moderator participation explaining anything, just we users are here for that.

    Many things about Macs are auto-detected by them and when detected the appropriate preferences appear as if by magic. Someone with a new iMac who has successfully connected to an input source would be able to say definitively if the preferences change.

    As for what can be hooked up to the port and used, most of the adapters of which you refer are uni-directional, designed for video output only. Apple states explicitly in the webpages describing the new iMacs and their features that the port accepts a signal from another device with a mini-DisplayPort only. So if you have a Mac laptop with a m-DP you can hook it to your new iMac as the monitor with a m-DP to m-DP cable. Apple sells one made by Belkin in the Apple Store.

    The other thing about the m-DP is that is does not carry audio. So the idea of hooking it up to a Blu-Ray player is still just a hyped idea. However, it appears that Belkin is developing a black box to facilitate this idea. Earlier in the week some folks here in the forum linked a Belkin website page with an HDMI to m-DP adapter to convert an HDMI signal to m-DP input. Later this week Belkin took down the page, so perhaps it is not yet ready for production and sales! On one side is an HDMI input. Coming out the other side is both a m-DP and a USB port. I think that the black box separated the signal into audio, to send to the Mac over USB and video, to send to the Mac over m-DP. The USB port could also supply any power the box may need to its job.

    Dah•veed
  • ChicoMac Level 1 Level 1 (0 points)
    Mini Displayport does support audio but I don´t know if the one in the new iMacs does!

    http://en.wikipedia.org/wiki/Mini_DisplayPort
  • Rick Lang Level 4 Level 4 (1,230 points)
    Bradley, the 27" iMac (late 2009) automatically detects when a mini DisplayPort signal is connected but only picks up video signals, not audio. From Apple's webpage about the ports where Apple refers carefully to "display" functioanlity:

    "Mini DisplayPort.
    The Mini DisplayPort lets you connect an external display, including the Apple LED Cinema Display, to your iMac. On the 27-inch iMac, the same port offers input, too. So you can connect any external source that has DisplayPort output — including a MacBook or MacBook Pro — and use your iMac as a display."

    I think if someone plugs their digital (optical) audio OUT to the iMac's audio IN port at the same time it was fed a DisplayPort signal, the iMac may use the audio then, but not via the mini DisplayPort IN connection. Not aware if anyone has tried it.
  • Jeff Greenberg Level 3 Level 3 (585 points)
    Bradley Dichter wrote:
    Supposedly you can connect a video source to the MDP port, rather opposite of it's traditional use on older models. I see no option in System Preferences - displays that mentions switching to this new input. Does the Mac auto sense a signal here and switch to in automatically?


    You press cmd-F2 to switch between external monitor mode and normal operation.