Raspberry Pi on Monitor

Hi!
Currently we are using a Raspberry Pi in our school. The connection is
mainly established via SSH or RDP.
What hints do you have, connecting a Pi directly to a monitor that has
no HDMI port?
Our first attempts using HDMI-DVI-Adapters didn't work well. The monitor
didn't show anything from time to time.
How can a Pi be connected to a monitor very cheaply?
Thanks for your help.
Best,
Marco.
Reply to
Marco Bakera
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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).
Reply to
A. Dumas
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.
--
Chris Green
Reply to
cl
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).
--
Alan Adams, from Northamptonshire 
alan@adamshome.org.uk 
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Reply to
Alan Adams
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.
Reply to
Rob Morley
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.
Reply to
Nikolaj Lazic
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
--
Windows 8.1 on PCSpecialist box
Reply to
David
Except he stated they were trying to use "HDMI-DVI-Adapters" - it's still up there. ^
Reply to
Rob Morley
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:
formatting link

Gordon
Reply to
Gordon Henderson
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.
Reply to
Marco Bakera
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.
Reply to
Marco Bakera
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
Reply to
Gordon Henderson
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
--
Windows 8.1 on PCSpecialist box
Reply to
David
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.
--
Alan Adams, from Northamptonshire 
alan@adamshome.org.uk 
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Reply to
Alan Adams
Don't forget screen-saver! Tap the space key or jiggle the mouse and wait for the image to return.
--
- better to learn by mistakes of others, - Wiz. 
  -  erroneous examples as provided, - Wiz. 
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Reply to
DisneyWizard the Fantasmic!
NEVER trigger the screen-saver with the space key! Always use Shift, Control, Alt or another modifier key.
Reply to
Rob
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
Reply to
Ian Stanley

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