Raspberry Pi on Monitor

That might be a failing of the connection or the cable, or maybe it's a power issue (cheap/limited net adapter), or maybe the monitor is about to break down. There is no translation of the signal at HDMI-DVI adapters, it's merely a different plug (and no audio).

There shouldn't be any issues doing this, it's a very straightforward sort of connection. I use several HDMI DVI-D cables and they 'just work'.

N.B. these are just cables, nothing more, connect the right wires in HDMI to DVI-D and that's all that's needed.

It should work if the monitor input is DVD-D or DVD-I. It won't work if the input is DVI-A (which is analogue only).

I'd always assumed that any monitor that had DVI was at least DVI-D. If it's only DVI-A why bother with DVI at all? DVI-A is just VGA with a different connector. Anyway the OP's problem sounds intermittent, so likely a power saving or bandwidth/resolution negotiation sort of thing.

Dana Sun, 6 Mar 2016 14:34:12 +0000, Rob Morley napis'o:

I don't think so... I think OP has HDMI -> VGA and has power issues.

Have you checked that the monitor works to another source (e.g. a PC) with a DVI cable?

I have also had problems in the past getting a monitor to switch automatically between Analogue and Digital.

It is not clear from your description if the connection never works, if it sometimes works when first connected and other times does not work when first connected, or if it starts working and then stops and starts again whilst you are using it.

Regards

Dave R

Except he stated they were trying to use "HDMI-DVI-Adapters" - it's still up there. ^

HDMI -> DVI adapters usually work very well. You may need to tell the Pi that it's really on HDMI though. Check the /boot/config.txt file - it will be full of comments if you have the default one, but this:

hdmi_drive=2

is the usual one you need to set to make sure it will work via DVI adapters.

Failing that, there are some good VGA adapters now. One I noticed recently even has a 3.5mm jack socket for audio:

Gordon

David schrieb am 06.03.2016 um 17:07:

What did you do to solve the problem?

There seems to be an option 'hdmi_force_hotplug=1' that asserts an HDMI-Monitor to be attached even if it's not.

It seems I have attached the monitor after starting the Raspberry Pi. Therefore the Pi didn't recognize the monitor.

Best, Marco.

Gordon Henderson schrieb am 06.03.2016 um 19:18:

I found the following explanation of that option:

hdmi_drive=1 Normal DVI mode (No sound) hdmi_drive=2 Normal HDMI mode (Sound will be sent if supported and enabled)

Why should setting the value to 2 fix it?

Best, Marco.

Because I goofed and copy & pasted the value without checking & changing it. You want =1 there, however I never needed it for the times I used DVI adapters to 2 different monitors.

Gordon

I discovered that one of the tiny buttons on the front of the monitor switched between Digital and Analogue mode.

I had expected auto detect to work.

Yes, forgot to mention that.

You should usually boot with the monitor attached to see if the Pi will pick it up automatically.

Cheers

Dave R

Generally if a monitor sees only one signal it will use it. If both are present you need to tell it which to use.

You can use the force option in the config file to allow for that. Otherwise, with no response from the HDMI, the pi will use composite video instead.

NEVER trigger the screen-saver with the space key! Always use Shift, Control, Alt or another modifier key.

what other connections has the monitor?

The all raspberry pi's support hdmi and analogue (composite or scart with an adapter)

My hdmi-vga just worked as did the dvi