No HDMI output Composite OK


60 posts   Page 3 of 3   1, 2, 3
by rpi_newbie » Fri Apr 20, 2012 10:11 am
@Simon H, not sure if Dom has integrated my latest changes on picking the best resolution. 1600x1200 is in the EDID and my current scoring formula would have picked it (when the preferred resolution is not recognised). These are all the formats

HDMI:EDID found DMT format: code 4, 640x480p @ 60 Hz in established timing I/II
HDMI:EDID found DMT format: code 5, 640x480p @ 72 Hz in established timing I/II
HDMI:EDID found DMT format: code 6, 640x480p @ 75 Hz in established timing I/II
HDMI:EDID found DMT format: code 8, 800x600p @ 56 Hz in established timing I/II
HDMI:EDID found DMT format: code 9, 800x600p @ 60 Hz in established timing I/II
HDMI:EDID found DMT format: code 10, 800x600p @ 72 Hz in established timing I/II
HDMI:EDID found DMT format: code 11, 800x600p @ 75 Hz in established timing I/II
HDMI:EDID found DMT format: code 16, 1024x768p @ 60 Hz in established timing I/II
HDMI:EDID found DMT format: code 17, 1024x768p @ 70 Hz in established timing I/II
HDMI:EDID found DMT format: code 18, 1024x768p @ 75 Hz in established timing I/II
HDMI:EDID found DMT format: code 36, 1280x1024p @ 75 Hz in established timing I/II
HDMI:EDID standard timings block x 8: 0x8180 714F 9500 950F A940 B300 0101 0101
HDMI:EDID found DMT format: code 35, 1280x1024p @ 60 Hz (5:4) in standard timing 0
HDMI:EDID found DMT format: code 21, 1152x864p @ 75 Hz (4:3) in standard timing 1
HDMI:EDID found DMT format: code 47, 1440x900p @ 60 Hz (16:10) in standard timing 2
HDMI:EDID found DMT format: code 48, 1440x900p @ 75 Hz (16:10) in standard timing 3
HDMI:EDID found DMT format: code 51, 1600x1200p @ 60 Hz (4:3) in standard timing 4
HDMI:EDID found DMT format: code 58, 1680x1050p @ 60 Hz (16:10) in standard timing 5
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by nimdy » Fri Apr 20, 2012 10:38 am
@rpi_newbie

Thanks for coming back to me. So how should I construct my config.txt to pick up these settings. Is it hdmi_mode=58/9 or another setting (I thought hdmi modes 58 and 59 were:

58 480i119   4:3          720(1440)x480i @ 239.76/240Hz
59 480i119H 16:9          720(1440)x480i @ 239.76/240Hz

which don't match the required 1680x1050@ 60Hz res.
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by Simon H » Fri Apr 20, 2012 10:52 am
I see that 1600x1200 is 4:3 which I guessed and is why I mentioned the aspect ratio whereas my monitor is wide screen which is probably why it picked 1680x1050 16:10.

I don't pretend to understand all the timing differences, when I have got some time I will try and learn more about it.

I may have missed the point in your technical replies but can you see any fix from the edid that would allow my monitor to be full 1920x1080 or will this be a future if at all thing, I don't want to take up all your time working on problems with one monitor as I am sure you are busy people or will it effect more models?

Windows seems to cope Ok but that is probably due to the acer drivers accounting for shortcomings in the monitor.

Thanks Simon.
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by rpi_newbie » Fri Apr 20, 2012 11:28 am
Hi Simon,

My code will only allow you to drive a mode if it finds it in the EDID. However, the EDID of the monitor does not list any valid 1920x1080 timing which is why you cannot get pi to output 1080p. There is a 1920x1080 timing in the EDID but the parameters are not correct. I wonder how many such monitors are out there in the wild.
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by Simon H » Fri Apr 20, 2012 12:00 pm
rpi_newbie said:


Hi Simon,

My code will only allow you to drive a mode if it finds it in the EDID. However, the EDID of the monitor does not list any valid 1920x1080 timing which is why you cannot get pi to output 1080p. There is a 1920x1080 timing in the EDID but the parameters are not correct. I wonder how many such monitors are out there in the wild.


Thanks, I am sure others will speak up if they have a simular problem like they have regarding my previous problem. Trust me to have one of the rare no standard ones.
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by rpi_newbie » Fri Apr 20, 2012 1:07 pm
nimdy said:


@rpi_newbie

Thanks for coming back to me. So how should I construct my config.txt to pick up these settings. Is it hdmi_mode=58/9 or another setting (I thought hdmi modes 58 and 59 were:

58 480i119   4:3          720(1440)x480i @ 239.76/240Hz
59 480i119H 16:9          720(1440)x480i @ 239.76/240Hz

which don't match the required 1680x1050@ 60Hz res.


These are CEA 58/59.

DMT 58/59 are 1680x1050 60Hz.

You need to set hdmi_group = 2 to use DMT mode.
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by nimdy » Fri Apr 20, 2012 1:12 pm
Gotcha, thanks. I'll give it a go tonight. :)
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by rpi_newbie » Fri Apr 20, 2012 1:20 pm
nimdy said:


Gotcha, thanks. I'll give it a go tonight. :)



Just post the entire list here

http://www.raspberrypi.org/for.....ts/#p67219

Feel free to copy it to the Wiki page.
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by Simon H » Fri Apr 20, 2012 1:25 pm
Looking at the Information under the monitor OSD the PC input sets it to

1920x1080 @ 60 H:66KHz V:60Hz. Not got the Pi here (Boss doesn't like me playing with it all day :) ) so can't see what that does but will try when home.

Also in the OSD there is a option to turn DDC/CI off, could I override it in config.txt then?
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by rpi_newbie » Fri Apr 20, 2012 9:25 pm
If "turning off DDC" is what I think it is, it will make EDID unaccessible. If the monitor keeps hotplug high, you might be able to persuade the pi to output an explicit mode. You might also need to force hotplug to be high or the pi won't output anything.
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