Pi4 unable to display >640x480 on Sony Bravia KDL-26ex550

mmajd80

Group CEA has 4 modes:
mode 4: 1280x720 @ 60Hz 16:9, clock:74MHz progressive
mode 16: 1920x1080 @ 60Hz 16:9, clock:148MHz progressive
mode 95: 3840x2160 @ 30Hz 16:9, clock:297MHz progressive
mode 97: 3840x2160 @ 60Hz 16:9, clock:594MHz progressive

Group DMT has 2 modes:
mode 4: 640x480 @ 60Hz 4:3, clock:25MHz progressive
(prefer) mode 16: 1024x768 @ 60Hz 4:3, clock:65MHz progressive

state 0xa [HDMI CUSTOM RGB full 4:3], 1024x768 @ 60.00Hz, progressive

I don't know why, but you'll notice above that there are 2 modes with value = 16. If you look at the config.txt embed in the link, you'll see that I have set hdmi_mode = 16, hoping it was 1920x1080, but it is outputting 1024x768. I don't know why.

mitu

@dankcushions said in Pi4 unable to display >640x480 on Sony Bravia KDL-26ex550:

hdmi_group=2

If you take a look at the video configuration page I posted earlier, you'd see that 1080p (CEA) is:

hdmi_group=1
hdmi_mode=16

you have

hdmi_group=2
hdmi_mode=16

which forces the DMT-16 mode - 1024x768

mmajd80

@mitu

Making that change resulted in the Check Device Output error I encountered above. I changed nothing else in the config, only that value from 2 --> 1.

mitu

That's strange, since the TV reports it supports the mode:

 mode 16: 1920x1080 @ 60Hz 16:9, clock:148MHz progressive

Try maybe with 720p (hdmi_mode=4) ?

dankcushions

i would also comment out

hdmi_drive=2

it's not on by default, and is only needed to fix sound issues AFAIK. it can have detrimental effects: https://retropie.org.uk/forum/topic/3975/hdmi_drive-2-fixing-audio-but-affecting-picture

mmajd80

@dankcushions @mitu

Would it surprise you to know that I had audio troubles as well? Commenting out that line has resulted in no sound again. Unfortunately, it did not resolve the video issue, either with mode=4 or 16.

I got the same error with group = 1 and mode = 4. The issue seems to be with the group.

Not sure if this helps, but here is a screenshot from Advanced Settings --> Resolutions:
Advanced Settings.jpg

Setting mode = 82 (and 85) resulted in the error as well. It seems like I need to force the tvservice to include this mode somehow...

I should have warned you guys that nothing wrt me and technology work easily. I am probably on hour 25 of configuration.

dankcushions

since 82 damn near gave me a heart attack.

what do you mean by this? corruption in the image? it could be your HDMI cable is crapping out once more bandwidth is being asked of it. i would get a new micro hdmi cable (anecdotally, the first cheap one i bought didn't work properly)

mitu

@mmajd80 said in Pi4 unable to display >640x480 on Sony Bravia KDL-26ex550:

Would it surprise you to know that I had audio troubles as well

No, but that's expected when using a DMT mode - since the Pi thinks you have PC monitor connected, not a TV. Should be fixable if you add hdmi_force_edid_audio=1 to force audio via HDMI.

mmajd80

@dankcushions

No, I just meant that the error that changing it to an unsupported mode gave me the Check Display Output error and I was afraid I was going to have to start over AGAIN.

The cable is from Pi itself, as is the power source. I will try the other cable it came with, but I don't think that's the issue.

mmajd80

@mitu

If I want to use the create new mode function that you linked to earlier, do I just need to put in the line:

hdmi_cvt=1920 1080 60 3 0 0 1

?

Or do I need to define these variables with the code at the top as well?

dankcushions

@mmajd80 said in Pi4 unable to display >640x480 on Sony Bravia KDL-26ex550:

@dankcushions

No, I just meant that the error that changing it to an unsupported mode gave me the Check Display Output error and I was afraid I was going to have to start over AGAIN.

that's exactly the error i got with my bad micro hdmi cable, fwiw.

i think we need and updated copy of config.txt for what you're trying. we've not seen one that looks right so far.

mmajd80

@dankcushions

Lol, if all this pain was over a freaking cable...

dankcushions

@mmajd80

hdmi_group=2
hdmi_mode=16

which will force 1024x768 (not what you want)

you still have hdmi_drive=2 set (mitu has posted a workaround for your sound issue)

what is the config.txt that you think should work but is not?

mmajd80

@dankcushions

Any config.txt with hdmi_group = 1 has resulted in a loading error and any mode other than hdmi_mode = 4 or 16 result in the same.

Additionally, setting the framebuffer_height/width and disabling hdmi_group/mode also results in a loading error.

The config.txt uploaded is the latest configuration that actually works. It does display 1028x768, but it DOES display.

I am not in front of the Pi at the moment, but I will make the audio change suggested and comment out the other line when I can get back to it.

mmajd80

@dankcushions

Given the Advanced Settings, I was hoping that one of mode = 51,82,85 would work, but none did. What confuses me is that the tvservice command lists only 2 modes for DMT, but Advanced Setting lists all of the others. To my stupid eye, it seems like a setting needs to exist in both lists in order to work; hence my clarification question about what code I need to add in order to force a mode above.

dankcushions

@mmajd80 said in Pi4 unable to display >640x480 on Sony Bravia KDL-26ex550:

@dankcushions

Given the Advanced Settings, I was hoping that one of mode = 51,82,85 would work, but none did. What confuses me is that the tvservice command lists only 2 modes for DMT, but Advanced Setting lists all of the others. To my stupid eye, it seems like a setting needs to exist in both lists in order to work; hence my clarification question about what code I need to add in order to force a mode above.

looking at the source code for raspi-config, it looks like you're getting the default modes, not the ones appropriate to your tv, as it fails to dump the EDID data. i also get that (although those modes do work fine on my tv). i would ignore them for now.

Any config.txt with hdmi_group = 1 has resulted in a loading error and any mode other than hdmi_mode = 4 or 16 result in the same.

it's the combo of group and mode that's important. that's what we need to know.

The config.txt uploaded is the latest configuration that actually works. It does display 1028x768, but it DOES display.

ok, but you can get at the config of a failed launch - just put your SD card in a PC and you'll have access to /boot/config.txt

Additionally, setting the framebuffer_height/width and disabling hdmi_group/mode also results in a loading error.

this setting has nothing to do with this issue.

YFZdude

Just spitballing here....

Does the TV have multiple HDMI ports?
Are any of those intended for PC use and not general DVD/Receiver type devices?
Or maybe just try a different HDMI input port for the heck of it if you haven't already.

It just seems so odd that your TV craps out on the CEA modes.

mmajd80

@YFZdude @mitu @dankcushions

It was the freaking port.

I connected it to the second port and booted it up, then started playing around with the config again. Lo and behold, hdmi_group=1 didn't cause a catastrophic error! The rest was cake, thanks to you guys.

Very much appreciated, thank you so much for all your help!