DVI/HDMI Switch

Hi this is a loosely related question when it comes to the Apple TV but I wasn't sure where else to ask. Let me describe my set-up:
1 x iMac 24"
1 x Apple TV
1 x Television with DVI port
Currently the Apple TV is connected to my TV with an HDMI->DVI cable. I want to also hook up my iMac with a long DVI cable to my TV, so I'm figuring I will need some sort of switch to flick between the two inputs, presumably like a KVM switch. Has anybody got any thoughts on this, I would entertain alternative ideas?

You need a DVI switch, just make sure it has audio.

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Mac mini DVI through AV Reciever with hdmi switching

I have a Harman Kardon AVR445 receiver which had the ability to switch between two hdmi inputs and send hdmi to my television (Viewsonic 27" LCD). I plugged in my mac mini (Intel Core Duo) using a DVI-hdmi cable and my cable box to my receiver. Everything worked great. I could switch between the computer and cable box and the picture was great on the tv.
Now, when I shut of the receiver and later turn it back on, I have a problem. The cable box still works fine. But when i switch to the hdmi input used by the mac mini, there is no signal. The only way I can get it back is to put the mini into sleep (via the power switch or the Front Row remote) and then wake it up again.
I'm trying to get some information from Harman Kardon on what happens to the hdmi inputs at power down (standby actually) but so far, the tech representative has only stated the get "shut down".
I've even tried using the program SwitchResX to always keep the display at 1024x768 in case the computer is switching to an incompatible mode but I have not had any luck here.
Does anyone have any idea what could be happening to this signal lines that would cause the mac mini to stop outputing it's display? And why won't it return when the receiver is turned on again?
Thanks
Mac Mini Core Duo Mac OS X (10.4.8)

I imagine you could spend a lot of time trying to debug this while getting no closer to a fix. If you really want this to work, what you might consider investing in is a Gefen DVI Detective.
http://www.gefen.com/kvm/product.jsp?prod_id=1378
In spite of the typo in the first line on Gefen's website, what the DVI Detective does is store a monitor's EDID (not the computer's EDID as it says on the website; computers don't have any EDID. Monitors do.) and it will then "spoof" the monitor so that when the Detective is attached to the mini's DVI output, the mini will think there is always a monitor attached and will never get confused by an HDMI switch or a sleeping receiver or whatever it is that is causing the mini to lose track of your 27" TV. You will be able to set the mini to the output you desire and from the mini's point of view it will be as though the monitor never gets disconnected so it will constantly output the same format/timing. End of problem.

DVI-D - HDMI switcher - DVI-D

Hey friends,
I've got a fairly convoluted and confusing HDMI situation. As DVI matrix switchers are so expensive, I decided to get a HDMI switcher and HDMI to DVI cables. I have two Mac Pro towers, each with two DVI outputs, and two 24" Cinema HD displays. So, my signal flow is:
Mac Pros - DVI to HDMI cables (x4) - HDMI matrix switcher - HDMI cable - HDMI to DVI adaptor - Cinema HD tail
The monitors simply flash three short lights, which Apple support tells me means that they are recieving an invalid format or resolution. I thought that HDMI and DVI were completely compatible formats... Any ideas as to why this is not working?
Thanks!

Going through a lot of "adapters" in that setup (cables "adapters", switcher, dvi adaptor). I guess my first question would be to supply all the details of all those components to verify they are the proper components to handle the signals. So, list url's to all the stuff:
1. dvi-to-hdmi cable
2. hdmi switcher
3. hdmi-to-dvi adaptor
4. hdmi cables (including lengths)
Maybe there's something in the specificaions of these things that would indicate the problem.
Update:
As an experiment you might want to try a single monitor and macpro without the switch. mac pro --> dvi-to-hdmi cable --> hdmi-to-dvi adaptor --> monitor. If it works then obviously the switch would be the culprit.

Mac Mini on Toshiba Regza Z3030 42" via DVI- HDMI

Hello,
I'm trying to connect a Core2Duo Mac Mini (running 10.4.11) to a 42" Toshiba Regza Z3030 Full-HD TV via a DVI-HDMI cable. The TV does 1920x1080 (both i and p), but when I select 1920x1080 (interlaced) from the display resolution menu in System Preferences, I get a black frame around the image that is twice as large on the right side of the picture than it is on the left or top/bottom sides (so even if I enable overscan, the picture is not acceptable, as it's missing a strip of the desktop on the left, top and bottom sides then).
I'm running the TV on "Exact Scan" mode, which (according to the manual), should display a 1080 signal exactly the way it is received from the source, no stretching or scaling at all.
Incidentally, the grey screen with the Apple logo and the spinning progress indicator fills the screen completely in 1080i, but as soon as the login panel comes up, the picture gets the black bars, so I think it's a MacOS X issue. Can I somehow tell the Mac not to switch the display settings after the booting process is finished, as the image during the boot process is perfect?
Any hints on what I could try?
Thanks in advance,
Georg

Ok, I decided to take some more time and googled for how SwitchResX actually works and what all the settings in the "custom resolution" view mean. I stumbled across a very useful tutorial in this forum thread: http://www.avsforum.com/avs-vb/showthread.php?t=751713
Following these instructions (basically, I just had to play with the "front porch" and "back porch" parameters until the image was perfectly centered), I ended up with a custom resolution in which the image is centered, but still has black bars around it.
Next, I simply turned on "Overscan" in the Display preferences while setting the TV's HDMI port input to "Exact Scan", meaning it will display the image exactly the way it comes over the HDMI port, without extra scaling.
With this combination, I now ended up with a picture that fills the whole screen and has (according to a test image) a "1 to 1" pixel mapping. Also, for some reason, this new resolution that I made myself rather than taking the values off the internet "sticks" between sleep and wake cycles as well!
For some reason, though, the TV only reported that it supports 50Hz vertical sync in 1080p when I used the "Export DDC" function in SwitchResX, even though according to the manual it also does 60Hz (and the default 1920x1080, 60Hz resolution from the Display preferences works as well). Therefore, I was only able to make my custom resolution for 50Hz, as I need the values from the DDC export as a starting point.
I only want to use this Mac Mini/TV combination as a media center for movies and music streaming via iTunes, so I guess it won't make any difference wether I'm running it at 50Hz or 60Hz?
Anyways, I hope this thread might help other people with the same TV who are having similar problems with their Mac Minis.

DVI-HDMI Adapter for hooking up a HDTV...Few problems...

I have a spare 32" Sharp HDTV with HDMI, so I placed this next to my Mac Pro and used a DVI-HDMI adapter. Here are the problems:
With my standard GeForce 7300 GT you cannot use both connectors, as they are too close together - so I could not even test to see whether both DVI outputs can work at the same time. So I have to disconnect my 23" cinema display. Now, the Macpro recognizes the TV - in the display preferences - but the resolutions are not good - the only one that works is 1280x720. Other resolutions listed, ie, 1344x756 and higher are listed as interlaced and all cause flicker. This means I do not see the OSX top menus.
I wish to be able to show clients samples of edited movie clips on a HDTV both in FCP and standalone QT. I doubt that appleTV is the answer, as this only works in iTunes - plus, my Mac is next to my TV anyway.
Any thoughts on making this work better? I am trying to not have to buy a new video card. Maybe the Black Magic Intensity card for HDMI output is the answer?

I can live with the lower resolution - the TV is actually 1366 x 768, but the most annoying is not being able to use both DVD connectors on the card at the same time - they are too close together, how stupid is that?
Ideally, I would like to see both the cinema display and the HDTV running at the same time - or least not having to manually switch over the adapter at the rear.
I see no way around this, unless I change video cards but for $250 I can get the Black Magic HDMI card which outputs DV via HDMI to HDMI.

DVI video switch

Hi all -
Big fan, long time reader, first time poster =] I started out with a Motorola (comcast) HD dual tuner cable box with a Sony Grand Wega KF-60WE610 for my TV. This rear-projection LCD has a single DVI input as its HDTV input (Video 7). When I got my mac mini, I thought the DVI out to S-Video adapter would be ok to use for display purposes . . . however, when I hook the mac mini directly into the DVI input of the TV, the difference is incredible! So I have been looking at DVI KVM switches, however, I don't need the K or the M seeing as how I have the Bluetooth Keyboard and mouse. So all I really need is a DVI switch. I saw Gefen has one: http://www.gefen.com/kvm/product.jsp?prod_id=1819. It has 2 DVI inputs and 1 DVI out. This sounds like what I need . . . this seems like a common problem with the mac mini hooked up to a HDTV as the display . . . is this the common solution? Is there a better way around this problem? Is there a better 2/1 DVI switch available? I have read alot about the DVI KVM switches, however everyone seems to ***** about the K or the M in the KVM switching capabilities . . . any input would be greatly apprecieated.
Thanks!
Mac Mini Mac OS X (10.4.4)

I have the exact same issue. I tried buying a new receiver as a component to add to the setup in my den with the TV. Many new receivers now feature HDMI switching. But I ended up returning the receiver and learned the lesson that these first generation HDMI receivers are not quite ready for prime time. It wouldn't pass the DVI signal from the mini to my TV, even though a direct connection between the mini and the TV works fine.
Personally, I am just going to wait for a better generation of HDMI switching receivers, even if I have to wait until gen 3 (2008?). But if you want the have switching today, someone else on this forum pointed out that monoprice has some cost effective 2- and 4-port switches. I have no idea how well they work, so you might want to find out what their return policy is should you buy one and it not work out.
http://www.monoprice.com/products/product.asp?cid=101&cp_id=10106&cs_id=1010602&pid=2721&seq=1&format=2

No event in Udev upon connecting a DVI-HDMI display

Hi all!
Im pretty new to Archlinux and sarted "linuxing" generally not so long ago.
Arch is my latest stop and love-for-first-sight, learned a lot from its wiki and forum.
I tried to cook (honestly more like copy) a script today to let KDE (xrandr) automatically configure my TV, which is connected with a DVI-HDMI cabel through a HDMI switch.
As per instructions i tried to check out its proper name with
udevadm monitor
but there r absolutely no events in it.
Im guessing thats why my script isnt invoked upon connecting/disconnecting.
Also, even if i connect/disconnect TV, KDE generally does not get it untill i let Display Settings run or
xrandr
from terminal.
That means if i disconnect, then reconnect, my settings r still the same. If i run any of them in the while, or boot up Linux so that my TV is turned off, i loose my settings.
Is that normal?
What can i do that i can get udev events?
Thanks a lot for your help guys in advance!
EDIT:
Two more things
Disconnecting my primary monitor shos nothing as well at udevadm monitor.
Interestingly DVI-0 is my TV with DVI-HDMI connection
HDMI-0 is my primary monitor with DVI-DVI connection.
Kinda weird.....
Last edited by dragonreborn (2014-08-11 21:50:18)

dragonreborn wrote:What can i do that i can get udev events?
Fix the driver in the kernel to broadcast uevents on HPD handling.
Last edited by falconindy (2014-08-11 22:00:31)

No video through Kinivo 301bn HDMI switch

Apple TV MD199LL/A
This problem started in late October. Unfortunately, I cannot correlate it to the Apple TV software upgrade pushed out at that time.
From Feb 2013 through October 2013, this setup worked fine: Apple TV --> Kinivo 301bn --> HDMI-DVI cable --> Sony Projection TV. Now, there is no video but audio works fine.
I have restored the Apple TV through iTunes, upgraded Apple TV to 6.0.2 (released 14 November 2013), even got a replacement Apple TV from the Apple store, and in all cases, video will not pass through the Kinivo HDMI switch.
I removed the switch from the equation (Apple TV --> HDMI-DVI cable --> Sony Projection TV) and everything works perfectly at 720p (the TV does not support 1080p).
Kinivo is sending a new switch, but I am guessing that will not fix the problem.
Does anyone know if Apple messed with HDCP in the 6.0.1 SW update for Apple TV (24 October 2013)?
If not, does anyone have any other ideas as to the problem/solution?

Just to follow up and close this out:
- Kinivo's replacement had the same issue.
- I daisy-chained another active device between the Apple TV and the Kinivo. This device splits the audio out from the HDMI into L/R channels, but it also maintains the EDID signal back to the Apple TV (as the Kinivo should, as well.)
In this configuration, video successfully made it to the TV through the Kinivo. My conclusion is that the Apple TV configuration did change something that affected part of the EDID handshake, which the Kinivo switch could no longer handle.
For you geeks out there, this phrase from an Extron white paper may help:
"Additionally, a display may handle a new input selection by switching only the TMDS or DDC lines from the previous source, but doing nothing with the HPD line. This can be a problem, because some sources wait for the HPD line to change state before sending video. In such cases, switching between inputs on a display can result in no viewable picture until the system is power-cycled."
For your additional reading pleasure, please see the following links:
http://www.extron.com/download/files/whitepaper/edid_guide_wp.pdf
http://missingremote.com/blog/experience-hdmi-handshake-issues
I'm now searching for a single active device that will handle these ambiguous areas within the HDMI standard. Hopefully it won't cost me a mint.
In the end, Kinivo could not solve the problem, so they refunded my money. The switcher was still within the 1-year warranty.

Belkin HDMI Switch - Apple TV doesn't work?!!

Hi all,
I have just bought myself a Belkin HDMI 3 port switch
http://store.apple.com/uk/product/TM026B/A
I've plugged it all in and my PS3 works through it, I plugged my PowerBook into it (using DVI-HDMI cable) and they work great and yet plugging my ATV into doesn't work. I've tried unplugging the ATV and Switch and then turning them back on again but still no luck.
I don't suppose anyone has any advice?

It seems that Apple TV doesn't support many HDMI switches!
Just in case anyone else comes across this problem then it would seem that the only switch to buy is the OPPO HM-31.
See this thread for further info:
http://discussions.apple.com/thread.jspa?threadID=1251451

50L2400U and HDMI Switch Problem

I just purchased a 50L2400U LED TV and am having a problem, First there is only two HDMI ports and I have three HDMI devices, I have a HDMI switch the same one I used on my other HD TV when I hook up the switch nothing happens the LED lights up on the switch but cant switch between the Roku and the DVD player. Anyone have any idea what the problem could be ???

Gefen makes a product called the DVI Detective that is made just for such situations. You insert it between the mini and the receiver and it spoofs the mini into thinking the TV is always attached, even when the receiver is switched to something else.
Of course the downside is you are adding more hardware and it isn't cheap, but I don't know of any other workaround that will succeed, and this definitely will.
http://www.gefen.com/kvm/product.jsp?prod_id=1378

[Solved] No video in nvidia HDTV after HDMI switching

My HDTV client (Arch64bit,XFCE) goes through a Receiver which can switch HDMI inputs, then to a HD monitor. Until recently, I could switch and find the video still working when I switched back. Recently this changed. The HDTV client also dual boots Win7, which does allow switching. To wit:
HDTV client setup(dual boot,HDMI,nvidiaGT610):
‥Archlinux/nvidiaGT610 ->SwitchingReceiver->SamsungHDmonitor
‥Win7/nvidiaGT610 ->SwitchingReceiver->SamsungHDMonitor
Previous behavoir:
…switching away from HDTVclient then switching back - HDmonitor video works
Current Behavior:
…switching away from HDTVclientWin7 then switching back - HDmonitor video works as expected
…switching away from HDTVclientArchlinux then switching back - HDmonitor video blank (no signal) but Remote desktop works, shows X11 working (putty SSL, vnc Remote Desktop). Requires reboot to restore video with HDmonitor on and Receiver HDMI selected to HDTV Archlinux/nvidiaGT610.
Recently there has been an upgrade to xorg-server:
[2015-02-16 08:56] [ALPM] upgraded xorg-server-common (1.16.4-1 -> 1.17.1-1)
[2015-02-16 08:56] [ALPM] upgraded xorg-server (1.16.4-1 -> 1.17.1-1)
[2015-02-16 08:56] [ALPM] upgraded xorg-server-devel (1.16.4-1 -> 1.17.1-1)
[2015-02-16 08:56] [ALPM] upgraded xorg-server-xephyr (1.16.4-1 -> 1.17.1-1)
and to the nvidia driver:
[2015-02-02 11:48] [ALPM] upgraded nvidia (346.35-4 -> 346.35-5)
[2015-02-07 10:47] [ALPM] upgraded nvidia-ck-k10 (346.35-3 -> 346.35-4)
[2015-02-08 05:25] [ALPM] upgraded nvidia (346.35-5 -> 346.35-6)
[2015-02-28 09:15] [ALPM] upgraded nvidia-utils (346.35-2 -> 346.47-1)
[2015-02-28 09:15] [ALPM] upgraded nvidia-libgl (346.35-2 -> 346.47-1)
[2015-02-28 09:16] [ALPM] upgraded nvidia (346.35-6 -> 346.47-3)
[2015-02-28 09:16] [ALPM] upgraded nvidia-ck-k10 (346.35-4 -> 346.47-3)
[2015-02-28 09:16] [ALPM] upgraded opencl-nvidia (346.35-2 -> 346.47-1)
I could use some suggestions for debugging this... .. .
Notes:
․xorg.conf points to EDID file recovered from Samsung using direct connection
․DPMS disabled in xorg.conf
․xscreensaver is not installed
․Power Manager / Display setting to never
․Per graysky's admonition, this also occurs with non-ck 3.18.6-1-ARCH #1 kernel and nvidia's 346.47
xorg.conf http://pastebin.com/jhjHzT5X
Xorg.0.log http://pastebin.com/4LkNHrAM
Last edited by keepitsimpleengineer (2015-03-16 17:57:30)

Thanks to Evangelos Foutras (foutrelis) the issue is solved and the Bug FS#44199 - No video in nvidia HDTV after HDMI switching is closed.
The bug...
In xfsettingsd 4.11.2 there appears to be a regression that when a TV hooked up to the computer via HDMI gets power cycled, it stops displaying anything.
It happens via a RANDR event being sent to all X clients when the TV gets turned off.
xfsettingsd thinks that it should switch to an internal output, but desktops don't have one. So when the TV comes back on the bus it seems like it's an extra monitor and xfsettingsd gets confused.
My new workaround...
Unwilling to do any testing on a remote HDTV client for domestic tranquility reasons, I did this…
Dug out an old monitor, searched through the parts drawer and found a DVI-to-DB-9 converter, plugged it in and tested that per description in XFCE Bug 11107 - xfsettingsd resets TV mode to NULL on power cycle.
The problem is (re)solved as video is restored after switching.

Hdmi switcher

I only have one HDMI input on my HDTV, so I'd like to use an HDMI Switcher to take in my Apple TV, Fios box and Blu ray player and output to TV. I purchased one that works great with Fios and Blu Ray, but when switched to Apple TV, the video is scrambled. I remember hearing about some kind of handshake issue with switchers and Apple TV, so if someone could recommend a solution, or better yet, a switcher that works with Apple TV, it would be greatly appreciated, thanks!

I'm having the same problem coming out of my 2009 Mac Mini going to an IOGear 3 > 1 HDMI switcher. I want to make sure I'm getting the right device. Does the Connect PRO DVI emulator just connect to the back of the Mac Mini and the adaptor cabe then from the CP to the HDMI switch?
http://www.amazon.com/ConnectPRO-DVI-EDID-Ghost-Emulator-Professional/dp/B0032FF 7B2

Getting Audio to an HDMI Switch

I have an older (2006) mac mini that I would like to connect to an HDMI switch. Does anyone know of a cable that will connect both my audio and video from my mac mini to a single HDMI cable?
I have a DVI to HDMI but I know that DVI doesn't support audio.
Any suggestions or links to a cable that will work?
Thanks,
-Paul

I've posted a link to the connections of my Mac Mini (Mine is the one on top)
http://www.google.com/imgres?imgurl=http://www.macminicolo.net/imini/2009/19backcompare.JPG&imgrefurl=http://www.macminicolo.net/macmini2009.htm l&usg=__g0XTe9WCEizsmf9uSPb1s70zA1c=&h=2848&w=4272&sz=4244&hl=en&start=30&sig2=b Yy8PfactSYzte7FfoBgg&zoom=1&tbnid=OQyJR7LUBp8FAM:&tbnh=135&tbnw=182&ei=LC-nTem0Gsni 0QGp6-35CA&prev=/search%3Fq%3Dmac%2Bmini%26hl%3Den%26sa%3DX%26biw%3D1289%26bih%3 D910%26tbm%3Disch0%2C956&itbs=1&iact=rc&oei=Ci-nTfLWO6i20QGY59z5CA&page=2&ndsp=3 0&ved=1t:429,r:28,s:30&tx=94&ty=63&biw=1289&bih=910

Macbook Pro 2011 DVI HDMI out does not work with TV when the power cable is connected

My Macbook Pro (Early 2011) DVI HDMI out does not work with TV when the power cable is connected. If get the blue screen and then can use the macbook but nothing is displayed on the TV. If i go into display I can see that there are two screens but nothing displayed on the TV. If i take the power cable out at this point the TV shows the second desktop as expected. If i then reconnect the cable, the screen flickers, as though it is being affected by the power cable, and the screen goes blank on the TV. Only if i remove the DVI cable do i get the blue screen again. If i remove the power cable and reconnect it will do it every single time, so i cannot see it being a TV issue or a minor glitch.
I have had this working previously but at the minute it seems to not be playing ball....any thoughts
Thanks
Dan

BUMP
Any ideas?

I've just hooked my 20" iMac up to my Toshiba 37" HDTV using a mini dvi-HDMI adapter, and works well, EXCEPT for the green tinge (or hue) that is showing up on my TV. Any suggestions or ideas?

I've just hooked my 20" iMac display up to my Toshiba 37" HDTV using a mini dvi-HDMI adapter, and everything works well, EXCEPT for the green tinge (or hue) that is showing up. Everything else looks pretty good though..... The color that is on my iMac is still good, Its just green on the TV.
Anyone have suggestions or ideas?

Try opening the Display System Preferences, then click on the Color options in the Display preferences window that appeared on the Toshiba display. Click on the Calibrate button and follow the instructions for creating a custom ColorSync profile that will hopefully solve the green tinge issue. The Apple Display Calibrator Assistant software that launches when you click on the calibrate button will walk you through the process.Assuming that the green tinge is minor and that you don't have a more serious cable or hardware issue, I am hopeful the results will be worth it.

DVI/HDMI Switch

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