RPi 4/5 + Denon AVR - 4k60 'No Signal' issues

Thanks, I read that throughout this topic already but haven't tried it yet. Unfortunately my SD Card broke down after like 5 days of use (Wow...) but I will try it once I've recovered everything. Strange nonetheless because I couldn't find anything different to those Inputs apart from Input Mode (HDMI vs. Auto) according to the manual.

Quote from chewitt

This thread is known to devs but since none of them have an afflicted AVR themselves it's not something that's easily tested. If the current investigation comes up with anything (nothing yet, and it's unlikely to be quick) then we'll flag the change and have you all test something to see if the issues are related. In short:

I installed 12.0 from scratch on a new SD-Card of same type and configured everything like in 11.06
But with 12.0 the Problem is getting worse with my config.
(of cause i changed nothing exept switching to the new SD-Card)

11.06: RPI5@2160p@60Hz/59.94Hz->X3800H@HDMI5/6(Aux1+Aux2)->OLED83C37LA: no problems
12.0: RPI5@2160p@60Hz/59.94Hz->X3800H@HDMI1/2/3/4/5/6->OLED83C37LA: 1/2 to 2/3 of time; no signal

So the solution for me is:
a) stay on 11.06
b) switch to 2160p@30Hz/29.97Hz
currently i'm back to 11.06 with no problems...

Yeah, unfortunately the same is happening to me. Since my SD Card broke down I had to reinstall 12.0 today on a new card. Getting the TV to show a picture during first boot was the hardest achievement. Had to reboot a few times until i could see a picture to configure hostname etc.

First thing to change after that was from 60 -> 30Hz, no problems from that point on. Unfortunately changing inputs on the AVR didn't do much for me. I have the same setup as you, just the 65 inch screen version.

I stumbled across this thread when I recently hit a similar problem with my new Denon AVR-S660H receiver + LG 55C3 TV and thought I would register to post just so that this model number now also comes up in search results in case it helps someone else.

I have the current stable version of libreelec installed on a brand new Pi 4B and I tested it worked ok with my TV by connecting directly to one of the TV's HDMI ports but when I tried it with my receiver I got no output.

In the end I resolved the problem by changing from the 'Media Player' input on the receiver to 'Aux 2' (as some, but not all, the posters in this thread have found). On my particular TV I note that the Aux 2 port is marked as being '8k' capable whereas the Media Player port is '4k' (although I've no idea whether or not that is relevant to this problem).

I can confirm this same problem occuring on my Denon x4700h. I have it hooked up to a Samsung UE55KS8000, and a raspberry pi5 with libreelec on it. It seems Denon does not agree with the Pi 5's take on 4k60hz resolutions.

When the pi5 resolution is set to 4k60hz i get no display though the Denon on any of the HDMI inputs. Tried 3 different cables. When i plug the pi directly into the tv, 4k60 works smoothly with HDR, so it is definately an issue with the Denon AVR. When i set it to 4k30 the denon will display the pi5's output, but the image quality seemed off, possibly an issue with HDR. I will need to do some more troubleshooting on this.

My current workaround is that i have hooked up the pi 5 HDMI output directly into the TV, and looped an SP/DIF optical cable back from the TV to the Denon AVR. Having activated HDMI CEC on all three devices i can still have the pi5 wake and shut down both the avr and tv. Only downsides are two cables running across the wall to the TV, and the whole HDMI feature on my AVR being bypassed, making switching to different sources besides the pi a bit more of a hassle.

Same problem on LE nightly and LE 12 with Marantz Cinema 50 and LG G3 from 2023.

Switching sources did not help. Unfortunately, as i must have CEC working correctly (which is very broken somehow in LE12), i had to switch back to my odroid n2 with coreelec.

In the end i also dropped the pi, and am now running an odroid h4 hooked up to the Denon. It has no issues with 4k60hz on Libreelec. And is not an issue on windows or ubuntu for the H4 either.

There was a recent kernel fix that could be helpful here.

I think the fix is included in LE 12.0.1. Might be worth a test.

I just got my RPi5 and can also confirm on LE 12.0.1 and denon AVR - no image on default 4K resolution. Sound present. Had to connect to TV directly, change to FullHD, and reconnect to AVR. Now ok. Kind regards.

Quote from Marcin

I just got my RPi5 and can also confirm on LE 12.0.1 and denon AVR - no image on default 4K resolution. Sound present. Had to connect to TV directly, change to FullHD, and reconnect to AVR. Now ok. Kind regards.

In case of RPi5 2GB, read here:

Thread

[RPi5 2GB] Not Rendering LE 12.0.1

With the keyboard I can navigate somewhere, by guessing how the interface will look like. But there was no chance to connect this thing to the network for debugging.

forum.libreelec.tv/core/attachment/10555/

How to reproduce

Steps to reproduce the behavior:

1. Flashing microSD card with Raspberry Pi Imager(on mac) or LibreELEC USB-SD Creator(on Windows).
2. Plugging pi 5 to external monitor(with HDMI0), placing microSD card and power cable.
3. Waiting to finish resizing a volume with automatic rebooting

…

stalko

August 28, 2024 at 8:15 PM

Da Flex thank you but it's a 4GB version.

Now, I am not sure as of why this problem exists. I have a quite old AVR, so maybe it just does not support 4K, and LE by default tries to force the highest resolution? If this was the case, then maybe it would be better to have LE start at a lower res by default on the first boot. The user can always set the res higher if needed. Apologies if I'm writing some BS. Kind regards

Quote from Marcin

and LE by default tries to force the highest resolution? If this was the case, then maybe it would be better to have LE start at a lower res by default on the first boot.

By default the Linux kernel uses the resolution that is flagged as the preferred one in the EDID (which it read from the connected AVR/TV) - so basically it's just following the wishes of the HDMI device which in general is a good thing.

Forcing some other resolution is quite tricky, there'd be some chance it's either too low or too high for some TV and thus that would again lead to "no signal" issues for other users.

The easiest solution is if you do that manually and choose the resolution you'd like - you can eg just append video=HDMI-A-1:1920x1080p60 to the end of cmdline.txt and the Linux kernel / LE will than use that instead of whatever the TV/AVR flagged as the preferred mode.

so long,

Hias

@HiassofT

Thank you for the explanation. As I mentioned before, I managed to fix my issue by connecting to a 4K capable TV first, lowering LE interface resolution to full HD and then connecting back to AVR. I do not actually know if LE booted at 4K with AVR connected on first attempt. I can only confirm that I had no image (sounds present), and when i hot-plugged (without reboot) hdmi from AVR to TV LE was at this point on 4k resolution. Kind regards