Hdmi switcher help?

mountaindew117

Hello everyone I'm coming to you today asking is there a way to use an HDMI Switcher that is a two port to one port from my Raspberry Pi to the one port and have it go to my portable screen and then the second port be connected to an HDMI extension that is mounted inside of my portable case that I can connect and HDMI cable to my TV while my Raspberry Pi is still operating inside of the case but then if I want to use it on my case screen is there a way to setup Raspberry Pi to be able to use both screens TV and portable without conflict? Try doing it last night on a dry run but my TV could not find an HDMI signal from the Raspberry Pi. But as soon as I plugged it into my portable screen it worked just fine.

Let me know what I can do to fix it to where both screens can work irregardless if one's on a portable screen or a TV.

Thanks for the help.

edmaul69

@mountaindew117 you need an hdmi y splitter. Here is an example

hdmi splitter

mountaindew117

@edmaul69 I already have the splitter selected and bought. I have bought this one here
link text

And I have it hooked up to the pi on the one port and the portable screen in port #1 of the split and my TV connected to port #2.

When I power it on my portable screen turns on fine and displays everything but then I push the button to go over to my TV and nothing shows up and my screen says no signal found. Wondering if the lines of code I had to put in to get my portable screen to work is blocking the switcher from displaying on my TV?

Unless theres coding that needs to be done to show up on both, I'm not sure.

edmaul69

@mountaindew117 what is the resolution on the portable? The pi is funny about a lot of "switching" hdmi adapters

mountaindew117

@edmaul69 it's a 1024x600

edmaul69

@mountaindew117 did you set it to that resolution in /boot/config.txt? If so your tv probably isnt compatible with that resolution.

mountaindew117

@mountaindew117 said in Hdmi switcher help?:

@edmaul69 it's a 1024x600

I'm not sure right off the top of my head I'll have to check it when I get home.

But is there a way to code the /boot/config.txt to work with both resolutions?

mountaindew117

This post is deleted!

mountaindew117

alt text

Yes it is set to the 1024x600 res. but is there a way to add a line of code that will allow the system to work for both my portable screen and a tv?

mountaindew117

![alt text](<a href="http://s450.photobucket.com/user/mountaindew117_08/media/sudo_1.png.html" target="_blank"><img src="http://i450.photobucket.com/albums/qq230/mountaindew117_08/sudo_1.png" border="0" alt=" photo sudo_1.png"/></a>)

mountaindew117

still havent had any luck yet on this has anyone got a idea on what could possibly be done?

mountaindew117

[URL=http://s450.photobucket.com/user/mountaindew117_08/media/my%20sudo%20nano_1.png.html][IMG]http://i450.photobucket.com/albums/qq230/mountaindew117_08/my sudo nano_1.png[/IMG][/URL]

this is what my sudo nano boot looks like. hopefully this will help the community a little.

BigEvilBarry

If still, it is necessary to look in this review, there is a good table with all the characteristics. Information about the drivers, too, will not be superfluous. I myself at first did not understand anything and I thought that the HDMI splitters and wireless HDMI are one and the same.

jeremysouthard

Sorry to bump an old topic, but I ran into issues getting an HDMI splitter working with my Raspberry Pi and thought I'd share what worked for me. I just fought with my config.txt file for 3 hours to get my raspberry pi to work with multiple monitors through an HDMI splitter. In the end, adding the following to my config.txt file is what saved the day:

hdmi_ignore_edid=0xa5000080

Why? Well...this took a little research because there's not a lot of clear information about what this setting does. Apparently most devices with an HDMI port use EDID (Extended Display Identification Data) so that when a source device is plugged in, the monitor/tv/whatever will send information to the device on the other end to let it know what screen resolutions it allows. Then, the Raspberry Pi (in our case) can pick the best one for the display. The problem here, is you can plug multiple different things into the splitter, so with EDID not ignored (by default) it will only pick-up one, or possibly none. In my case, my splitter preferred port 1 over port 2 and whatever was plugged into port 1 always worked.

I don't know what the value here "0xa5000080" actually means or if there are other appropriate values.

Clyde

@jeremysouthard said in Hdmi switcher help?:

I don't know what the value here "0xa5000080" actually means or if there are other appropriate values.

The official documentation says that "it requires this unusual value to ensure that it is not triggered accidentally." So, I guess that this value can never equal a real valid EDID by chance.

Thanks for this hint, by the way. My HDMI splitter also causes problems. It causes my Pi to choose a wrong video mode on the first cold boot of a day. As soon as the splitter has power for some seconds, the Pi boots fine. Maybe your tip can spare me the pain of having to switch the splitter and the Pi on, then off, then on again – or turn it on once and then reboot it via ssh – to have a picture after a couple of hours without power. I'll test it tomorrow.

Clyde

@Clyde said in Hdmi switcher help?:

My HDMI splitter also causes problems. It causes my Pi to choose a wrong video mode on the first cold boot of a day.

With hdmi_ignore_edid=0xa5000080, the problem is gone! 😄 Thanks again.