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

mmajd80

Ok, so this went both great and terribly.

I made the change to comment out the hdmi_safe line, but decided to leave the inputted resolution at 1280x768, as going back and changing that if this worked would be very easy. Then I rebooted (the missing # was a copy/paste error; the config file works fine).

So it started up well. The rainbow box that was in the middle of the screen now looks like this:

You'll notice that it fills top to bottom (the text that is cut off in the top left now says "720p", rather than "640x480, 60 Hz". That's the great part.

The problem now is that the loading cycle is unable to complete before going to an error message (which is coming from the TV, not the Pi):

After that line in the load screen, it goes to the following:
which reads "Signal not accepted. Check device output" and freezes. Now the only way to shut down the Pi safely is with Alt-PrintScreen, which are like a million miles apart on my keyboard lol.

And that brings us to present day.

YFZdude

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

tvservices:

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 1 modes:
(prefer) mode 4: 640x480 @ 60Hz 4:3, clock:25MHz progressive

state 0xa [HDMI CUSTOM RGB full 4:3], 640x480 @ 60.00Hz, progressive

Call me crazy, but doesn't the above indicate that your TV won't fully support the "mode 85" (1280x768) settings you are trying to force it to use?

Also, it is worth mentioning that since you have a Pi4 and the settings in the config file don't specify a port number, it will probably apply by default to the primary HDMI port. (Closest to the USB-C power connector.)

mmajd80

@YFZdude

Well, fudge.

Is there a way to load the config at startup, prior to it failing? As mentioned above, I have no ability to SSH into the Pi and REALLY do not want to go through yet another full formatting and installation cycle.

YFZdude

@mmajd80 If you have a SD card reader you should be able to edit the config.txt from another computer. If I'm not mistaken the config.txt should be in the /boot partition that is formatted as FAT32 so even Windows can read it.

mmajd80

@YFZdude

Dude, I think I love you?

That was genius, the fix did work, though not quite as I expected. These are the new results from tvservice:

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

Notice that the DMT group has a new mode (and is also the one that is used). I changed the config.txt file to read "hdmi_mode = 16", thinking that it would use the mode 16 from Group CEA, but it created that new one instead.

I feel like this is the very last thing to be done. How do I either switch to Group CEA or add another (functional) mode to DMT?

mmajd80

I don't know if this helps, but for reference, under raspi-config, it shows me the following modes:

4, 9, 16, 85, 35, 51, 82

but I don't trust it, since 82 damn near gave me a heart attack.

mitu

See this page for a list of supported video modes, there's no 1024x768 mode for CEA.

Why are you forcing a 4:3 video mode when your display is 16:9 ? You can 'create' a new mode - see here, but if you already have it working, that would be redundant.

dankcushions

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

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

tvservices:

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 1 modes:
(prefer) mode 4: 640x480 @ 60Hz 4:3, clock:25MHz progressive

state 0xa [HDMI CUSTOM RGB full 4:3], 640x480 @ 60.00Hz, progressive

Call me crazy, but doesn't the above indicate that your TV won't fully support the "mode 85" (1280x768) settings you are trying to force it to use?

i am not sure. if you set hdmi_safe it may list differently, hence i asked @mmajd80 to repost both the config.txt and output of that command again, after making suggested changes...

mmajd80

@mitu

As you can see from above, the "prefer" is pointing to a DVT setting, so while the CEA setting exists for 1920x1080, I cannt use it. In the DVT list, there are only two options (640x480 and my current 1028x768). I am not trying to force anything, but rather figure out how to get hdmi_mode = [SOME VALUE THAT RUNS AND IS BIG].

mitu

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

As you can see from above, the "prefer" is pointing to a DVT setting

This may be because you've manually added the mode to the config.txt.

so while the CEA setting exists for 1920x1080, I cannt use it

Why ?

mmajd80

@mitu

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?