Dual Monitors


22 posts
by pkor » Thu Jan 03, 2013 11:46 pm
Has anyone successfully used two monitors with a rasberrypi for mirrored or extended desktop, possibly a set up with one or both being touchscreen?
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by jamesh » Fri Jan 04, 2013 1:39 am
No, there is only one HDMI and one composite IF and they both display the same image.
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by ghans » Fri Jan 04, 2013 1:39 pm
Well , the blogger seems to be a real Linux guru.
Not something i am confident enough to try myself :

http://karuppuswamy.com/wordpress/2012/08/17/lilliput-displaylink-usb-monitor-um-70-17e902a9-with-raspberry-pi-on-raspbian/


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by pkor » Fri Jan 04, 2013 6:31 pm
Thanks for the replies. It really isn't important for this project to do extended desktop so the same image on both screens is no problem. Has anyone used a standard touch screen?
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by 4thdwarflord » Fri Jan 04, 2013 6:42 pm
if you had another computer you could have 2 desktops, one for each screen, using VNC.
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by mahjongg » Fri Jan 04, 2013 6:50 pm
When (somewhere in 2013, I suppose) the Raspberry PI foundation releases the DSI interface board you can connect an LCD panel, and that will act like a second, independent, screen.

see a description of the Display Serial Interface, and a picture of its position on the PI in this Wikipedia article: http://en.wikipedia.org/wiki/Display_Serial_Interface
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by Michael Meissner » Fri Jan 04, 2013 9:56 pm
Another possibility might be to use USB monitors. For instance, I noticed this via google: http://plugable.com/2011/12/23/usb-graphics-and-linux. :geek:
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by FragMonkey » Sat Jan 12, 2013 3:34 am
For my Windows PC I use a Matrox DualHead2Go. It accepts vga/dvi inputs from two monitors and tricks Windows into believing the two monitors are in fact one large display

http://www.matrox.com/graphics/en/produ ... o/digital/

I don't know if they make linux drivers, but I don't even install the drivers on my Windows pc. It seems to be largely a hardware solution, and it has worked fine on my PC for a time when I dual-booted Ubuntu.

However, the Digital Edition with the DVI inputs goes for about $215 on newegg and the analog edition with VGA inputs is about $150
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by andrewjoy » Fri Jan 18, 2013 4:06 pm
the raspi only supports 1 display, now i dont know if you could possibly use RS232 form the GPIO ( don't know if the GPIO uses RS232 or TTL logic would have to check) out to a serial terminal or to USB and have a PC running Screen and have text only output on that and then have another virtual terminal running on the pi and outputting to HDMI or composite
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by ghans » Fri Jan 18, 2013 4:16 pm
Yeah , the GPIO have a TTL tty which can display
very early boot messages. But in your setup you need three
devices (including a PC !) and two screens.

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by RaTTuS » Fri Jan 18, 2013 4:28 pm
best way is to have 2 RPi's to drive 2 monitors - how to share mouse and keyboard is easy ..
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by Sootie » Tue May 28, 2013 10:21 pm
It is possible with one of these

http://www.ebay.com.au/itm/USB-2-0-To-V ... 941&_uhb=1

A usb hub and heaps of stuffing around

but still...

Image
Image
Image
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by Rwreed » Wed Jun 12, 2013 1:58 pm
Sootie,

Do you have details posted somewhere on how you got this to work? This looks like the most promising option until dsi is supported.

Thanks in advance
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by Sootie » Thu Jun 13, 2013 3:22 am
I did have the image of it but it would appear I have deleted it unfortunately.

The basic steps were
1. recompile your own kernel with drivers as per here http://anup.info/blog/2012/10/13/raspbe ... mo-monitor
2. plug it all in
3. muck around with xorg.conf until it works (xinerama has to be on)

there is a heap of cpu used to do the dual monitors though and for some reason once you re-compile the kernel you cant use citrix xendesktop (which is what I wanted it for) it just crashes the whole pi

Not something I would recommend for anything except to say you could.
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by fonsek87 » Wed Oct 02, 2013 12:06 pm
Hi,

I´m searching information about manage my raspi throw ssp with my laptop and use the HDMI like second monitor.
Is it possible? I have been trying the last days but I don´t get it yet.
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by ghans » Sun Oct 06, 2013 8:16 am
You want to connect a TV to your Raspi and then use
this as second monitor to your Laptop ?? Your question is
a bit unclear.

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by rurwin » Sun Oct 06, 2013 9:32 am
You would be getting Windows (I assume it's a Windows laptop) to admit to having two screens. It can generally handle a separate display on the LCD and VGA-out. The trick would be to enable the VGA-out as a separate screen, even though no monitor was connected to it. Then run VNC and have it serve the VGA-out screen to a VNC client on the Pi.

Smells tricky to me.
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by PiGraham » Sun Oct 06, 2013 10:59 am
Is this relevant?
RasPi Video Wall
http://www.raspberrypi.org/archives/3648
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by jonsaddles » Fri Feb 14, 2014 4:04 pm
Realise this is an old post but I think what the op was looking for is similar to my requirements, that is to have 2 screens showing the same image.
For instance if I am working behind a counter and want my customer to be able to view the screen as well.
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by RaTTuS » Fri Feb 14, 2014 4:11 pm
use an hdmi splitter
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by jonsaddles » Fri Feb 14, 2014 5:50 pm
Ha yea fair enough, unfortunately my other monitor is composite input only and it's a built in unit so can't change it.
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by ghans » Sat Feb 15, 2014 9:20 am
Use a composite video splitter instead :

http://www.amazon.com/gp/aw/d/B00069R5L ... 35-0119336



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