Display does not work on big monitor, works on little one.

5 posts
by Harrkev » Tue May 29, 2012 3:03 am
I finally got a chance to really play with my Pi tonight, and I cannot get it work with my big monitor over DVI.

I have a HUGE 30-inch 2560x1600 monitor (Dell U3011), and I CANNOT get the Pi to talk to this monitor over a HDMI-to-DVI cable.

Note that this exact same cable works great with my spare Dell S2209W 1920x1080 monitor, so the Pi is OK and the cable is OK.

I can also get a display if I connect the Pi to the big monitor with a HDMI-to-HDMI cable, but that is not a long-term solution, as I need this thing to work through my DVI-KVM. I cannot have two monitors on my desk for more than a few days due to the "wife-approval-factor."

Yes, I tried the troubleshooting steps listed in the wiki.


It fails with a NO config.txt, and the following config.txt:


How do I debug this?
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by Harrkev » Tue May 29, 2012 2:36 pm
No ideas yet?

I do admit that it is a little perverse hooking up a $35 computer up to a $1200 monitor. :o
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by Harrkev » Tue May 29, 2012 4:47 pm
OK. I solved it.

The key turned out to be finding the right modes. hdmi_group=2 and hdmi_mode=69 gives me a perfect 1920x1200 display (awesome).

The trick turned out to be turning ssh on, and booting the device with the non-working display. From there, I was able to ssh in and determine what modes were supported (as it turns out, NO CEA modes were supported).

I do not know why auto-negotiation failed, and that is something that probably needs to be looked into.
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by dom » Tue May 29, 2012 5:17 pm
Can you capture your edid (with /opt/vc/bin/tvservice -d edid.dat) and post it here?
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by Harrkev » Tue May 29, 2012 6:38 pm
zipped edid file for Dell U3011 monitor
(234 Bytes) Downloaded 126 times
Here it is...
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