HDMI 4 Pi -- can't get 1280x800 to work

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jwatte
 
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HDMI 4 Pi -- can't get 1280x800 to work

Post by jwatte »

I have a HDMI 4 Pi that I bought in January. I've built a nice walnut wood case for it and everything. I connect using a short HDMI cable, and I drive it with a 12V benchtop power supply.

Now, when I hook it up to my Raspberry Pi, I can get it to display in 1280x720 mode, which causes the graphics to be slightly stretched vertically. However, I can't get it to display in 1280x800, which is the mode I want.

I need this to display in 1280x800 mode, because I'm using it as a control panel for a software system that's built for this resolution.

When I use the config.txt that you list on your Techincal Resoures page, the display comes up in 640x480 mode, which is not at all what I want.

Note that the "tvserver" command doesn't show "28" as a supported mode number, which is likely why trying that config.txt comes up in 640x480.

Help!

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adafruit_support_mike
 
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Re: HDMI 4 Pi -- can't get 1280x800 to work

Post by adafruit_support_mike »

What valid modes do you get from `/opt/vc/bin/tvservice -m DMT`?

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jwatte
 
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Re: HDMI 4 Pi -- can't get 1280x800 to work

Post by jwatte »

The modes in DMT are:

Code: Select all

Group DMT has 14 modes:
           mode 4: 640x480 @ 60Hz 4:3, clock:25MHz progressive 
           mode 5: 640x480 @ 72Hz 4:3, clock:31MHz progressive 
           mode 6: 640x480 @ 75Hz 4:3, clock:31MHz progressive 
           mode 8: 800x600 @ 56Hz 4:3, clock:36MHz progressive 
           mode 9: 800x600 @ 60Hz 4:3, clock:40MHz progressive
           mode 10: 800x600 @ 72Hz 4:3, clock:50MHz progressive 
           mode 11: 800x600 @ 75Hz 4:3, clock:49MHz progressive 
           mode 16: 1024x768 @ 60Hz 4:3, clock:65MHz progressive 
           mode 17: 1024x768 @ 70Hz 4:3, clock:75MHz progressive 
           mode 18: 1024x768 @ 75Hz 4:3, clock:78MHz progressive 
           mode 36: 1280x1024 @ 75Hz 5:4, clock:135MHz progressive 
           mode 47: 1440x900 @ 60Hz 16:10, clock:106MHz progressive 
           mode 48: 1440x900 @ 75Hz 16:10, clock:136MHz progressive 
           mode 49: 1440x900 @ 85Hz 16:10, clock:157MHz progressive 

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adafruit_support_mike
 
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Re: HDMI 4 Pi -- can't get 1280x800 to work

Post by adafruit_support_mike »

Try using:

Code: Select all

hdmi_ignore_edid hdmi_group=2 hdmi_mode=28
and see if that does any good.

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jwatte
 
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Re: HDMI 4 Pi -- can't get 1280x800 to work

Post by jwatte »

That just did 640x480, but the following worked:

Code: Select all

hdmi_ignore_edid=0xa5000080
hdmi_group=2
hdmi_mode=28
If you update the config.txt on the page http://www.adafruit.com/products/1287#Technical_Details it would probably help others, too!
Probably want to do it here, too: http://www.adafruit.com/products/1694#Technical_Details

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adafruit_support_mike
 
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Re: HDMI 4 Pi -- can't get 1280x800 to work

Post by adafruit_support_mike »

Glad to hear you found a configuration that worked.

We try to stick with default values on the product pages to keep things as simple as possible. For situations that require a customized approach, we use this as a resource: http://elinux.org/RPiconfig#Video_mode_options

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jwatte
 
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Re: HDMI 4 Pi -- can't get 1280x800 to work

Post by jwatte »

I don't understand. What's special about my situation? It's a Raspberry Pi model B, and it's your specific display controller board. There is no variant in this equation. Everyone would be having the same problem with this display board.
Or is it the case that the "HDMI 4 Pi" product may ship out a variety of different display control boards, some of which have bugs and some of which don't?

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adafruit_support_mike
 
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Re: HDMI 4 Pi -- can't get 1280x800 to work

Post by adafruit_support_mike »

You're working with a 1200x800 display that doesn't report the correct EDID, yes?

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jwatte
 
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Re: HDMI 4 Pi -- can't get 1280x800 to work

Post by jwatte »

Sorry, I didn't see this response.

Yes, I am working with a 10" TFT display that doesn't do the right EDID.

Specifically, it's the 10" TFT display I purchased FROM YOU (as you can tell by the description in the beginning in this thread, and again from the links to your catalog that I posted.)

So, for ANY CUSTOMER OF YOURS using this display, they will get a horribly scaled 1280x720 image on YOUR DISPLAY that YOU SELL FOR THE RASPBERRY PI, unless they apply this work-around.

Sorry to shout, but I think the things in caps are pretty clear from what I posted in this thread, and it's pretty clear that your documentation for your product isn't particularly helpful. I'm just trying to get you to help your own customers like me in the future, and I'm rather frustrated at the resistance.

Hence, why I think that your product page should list this work-around. I don't understand what's special about that? Do you want your customers of your display that you sell especially for the Raspberry Pi to get poorly scaled graphics, rather than the 1280x800 resolution that you advertise on that page?

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blake3
 
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Re: HDMI 4 Pi -- can't get 1280x800 to work

Post by blake3 »

Jwatte,

I will try your config.txt settings this evening (might work better than what I've got), but in addition, for anyone else struggling with this issue on the 10.1" screens (ID# 1694), see possible fixes in this thread as well:

viewtopic.php?f=47&t=55530

Just trying to tie all these threads together so that others will find this information easier, and I echo Jwatte's opinion about putting something in the tech details for this specific screen. I've now spent days on resolving this audio/resolution issue.

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jwatte
 
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Re: HDMI 4 Pi -- can't get 1280x800 to work

Post by jwatte »

Blake3, thanks.

It's interesting the Adafruit support didn't actually answer the request to improve the documentation.
Are Adafruit catalog pages "one and done"? Once written, never to be changed?

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blake3
 
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Re: HDMI 4 Pi -- can't get 1280x800 to work

Post by blake3 »

So, some sad news, my previous successes last night proved temporary, and I'm back to no sound, without changing anything except unplugging the system overnight. Additionally, your solution and Andrewsi's from another thread did not work.

So there you have it.

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