rpi_newbie
Posts: 27
Joined: Tue Apr 17, 2012 10:57 am

Re: EDID from large (> 1920 x 1200) displays

Tue May 08, 2012 11:05 am

Does any Raspberry Pi user have access to a large display with native resolution > 1920 x 1200? I am interested in collecting the EDID from such monitors.

Some examples of such monitors are:

NEC MultiSync MD301C4 2560 x 1600 native

NEC MultiSync PA301W 2560 x 1600 native

HP ZR30w 2560 x 1600 native.

If you have, could you capture the EDID with tvservice by typing:

./tvservice -d edid.dat

Please capture the EDID from each type of input from the monitor (e.g. one from DVI, one from HDMI) and name the EDID dump in the following format before posting online:

<Vendor>_<Monitor Model>_<Input type>.dat

You are welcome to run the new edidparser (from github) on the captured EDID if you want to find out what's inside.

Many thanks

Hexxeh
Posts: 91
Joined: Thu Apr 05, 2012 3:07 pm
Contact: Website

Re: EDID from large (> 1920 x 1200) displays

Wed May 09, 2012 6:00 pm

I use my Raspberry Pi with an iMac 27" display (late 2010 if it makes any difference), connected via a Kanex XD (http://www.kanexlive.com/xd). Here's the EDID dump: http://radium.hexxeh.net/iMac27.dat

I have to specify hdmi_mode=4 to get any output on this display last time I checked, there's been a few firmware revisions since I last played with that though.

The panel doesn't natively accept 1080p without scaling apparently, which might explain why I have to manually set it to 720p.

dom
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 5409
Joined: Wed Aug 17, 2011 7:41 pm
Location: Cambridge

Re: EDID from large (> 1920 x 1200) displays

Wed May 09, 2012 6:23 pm

With no config.txt and latest firmware you should get:

HDMI:EDID preferred mode remained as DMT (68) 1920x1200p @ 60 Hz with pixel clock 154 MHz

You will need hdmi_drive=2 if you want audio.

Let us know if that's not the case.

Hexxeh
Posts: 91
Joined: Thu Apr 05, 2012 3:07 pm
Contact: Website

Re: EDID from large (> 1920 x 1200) displays

Wed May 09, 2012 6:28 pm

Just tried that now, black screen, no display. Running latest firmware (using rpi-update, pulled the firmware binaries over from the firmware repo today).

dom
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 5409
Joined: Wed Aug 17, 2011 7:41 pm
Location: Cambridge

Re: EDID from large (> 1920 x 1200) displays

Wed May 09, 2012 6:50 pm

Bah. That should work. Does anything else successfully drive it at [email protected]?

As a long shot, could you try:

config_hdmi_boost=4

rpi_newbie
Posts: 27
Joined: Tue Apr 17, 2012 10:57 am

Re: EDID from large (> 1920 x 1200) displays

Thu May 10, 2012 1:57 pm

There are two variants of [email protected], one with reduced blanking and one with normal blanking. Raspberry Pi can only drive the former. However, the modified EDID listed the reduced blanking version of the format as the preferred resolution and that's what the pi is trying to drive. If the monitor does not support the reduced blanking version (or 1920x1200 in general, as stated on Kanex's page), then it is Kanex responsibility to present the correct EDID to the pi. I am waiting for a response from Apple regarding the original EDID of the display.

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