Chromecast 4k HDR EDID handshake with AVR

[bss_cc]

Hello

Everytime I restart my TV (LG) and AVR (Denon S660H) the Chromecast fails to set its resolution to 4k - defaults to 1080p.

My TV is set to ultradeepcolour. AVR set to 4k extended or 8k extended.

My cable is 48gbps certified.

When I connect the chromecast directly to the TV I am unable to reproduce the problem.

After searching online there are several people with the same problem and it seems to stem from the EDID handshake during boot up sequence of chromecast and AVR. Meaning that probably the AVR during the first seconds of booting is "allowing" a 1080p signal and the chromecast fails to set the correct maximum resolution.

After booting up I can set the resolution to 4k 8/10bits color without problem so it must be an issue during the EDID handshake / boot sequence.

Is it possible to fix this with a firmware update?
Thanks in advance

[Jeran]

Hey there bss_cc,

Welcome to the Chromecast Community Forum! That is an interesting interaction you've discovered. If you don't mind, would you be able to recreate the issue and then submit feedback via Google TV? That way, if there are any errors generated in the device logs, they would be sent to the Chromecast Engineering team to look into. This would help out a ton!

I look forward to your response, and if you have any other questions or concerns for me, please let me know.

Best regards,
Jeran

[bss_cc]

I've just submitted feedback through the GoogleTV - It defaulted again to 1080p after turning on...

[Jeran]

Hey there bss_cc,

Do you have any more questions that I can address? 

Thank you,
Jeran

[bss_cc]

Thanks for the reply.

No, its just this one problem that I would like to solve.

Although in the last few days the system seemed to "handshake" correctly, today it reverted to 1080p again.

Does Chromecast "save" the EDID settings after being connected for a determined time? Does it reset those settings after a week? A month? After 10 reboots?

I can try to send feedback via Google TV, and probably you can take a look at the logs and see when or why it goes for 1080p... 

Otherwise I will need to look at other devices until a new chromecast arrives.

[Jeran]

Hey there bss_cc,

Thank you for submitting feedback on that! It really does help the Chromecast engineering team out when trying to track down issues like these. In the meantime, does changing the Chromecast to any other HDMI port on the AVR help at all? Also, to narrow down the issue a bit more, are you able to see if the problem persists when connecting the Chromecast directly into the TV's HDMI port?

I look forward to hearing from you.

Best regards,

Jeran

[bss_cc]

Thanks for the reply. Yes it also happens although less frequently.

There are several reports with the same problem:

Chromecast with google tv keeps resetting the resolution from 4k 24fps to 1080p 60 fps

Chromecast with Google TV loses 4k and surround options randomly

So I think it is not an isolated issue.

The thing is, if I manually set 4k 60fps it works. So there must be a problem during boot / EDID handshake / HDMI handshake that tells chromecast to use 1080p...

Again, cables are UHD certified (Belkin)

HDMI ports set to ultradeepcolor

Receiver set to 4K extended (tried all the ports on the receiver and on the TV)

[Jeran]

Hey there bss_cc,

Thanks for linking those threads, I'll do some digging to see if anyone has found a workaround. Just out of curiosity, does your TV have any power-saving options enabled that could be affecting the HDMI-CEC of the Chromecast? If so, I would disable that setting for now.

Best regards,

Jeran

[Jeran]

Hey there bss_cc,

I'm just checking up; were you able to test that AVR with those power savings settings on the TV disabled? 

Thank you,
Jeran

[Jeran]

Hey there bss_cc,

Do you have any more questions that I can address? 

Thank you,
Jeran

[bss_cc]

Well, I did not change anything else and so far it seems to be working without losing the EDID settings!
Maybe because of the recent firmware update?

Fingers crossed to see if it continues this way!
Thanks for the help!

[Jeran]

Hey there bss_cc,

Awesome, I'm glad to hear that! Hopefully the recent firmware update helped out here. In that case, unless you have any additional questions, I'll lock this thread in 24 hours. Feel free to create a new thread if the issue occurs again.

I hope you have a good one!

Best regards,

Jeran