Updating from 11.0.3 to 11.0.6 on Raspberry Pi 4b with same configuration setting does not work propely

Hello to you all,

I'was on LibreElec 11.0.3 on Raspberry Pi 4b (HDMI on Samsung TV) fully working with this parameters on configuration files:

config.txt

gpu_mem=76
hdmi_ignore_cec_init=1
include distroconfig.txt
dtparam=audio=on
audio_pwm_mode=1

hdmi_force_hotplug=1
hdmi_ignore_edid=0xa5000080
hdmi_drive=2
hdmi_group=CEA
hdmi_mode=16

distroconfig.txt

arm_boost=1
arm_64bit=1
kernel=kernel.img
display_auto_detect=1
dtoverlay=vc4-fkms-v3d,cma-512 
dtoverlay=
disable_overscan=1
disable_fw_kms_setup=1

When system automatically updated to LibreElec 11.0.6, I had no video and no audio at all. The machine was operativa because I could see it on Kore (android app).

I've tried to turn on/off all those lines I customized, but my best result is video resolution 1024 (instead of 1920 of my TV) and no audio (with default config.txt except for "dtoverlay=vc4-fkms-v3d,cma-512" I need to see something, and default distroconfig.txt).

Command "tvservice -s" results "state 0x6 [DVI CUSTOM RGB full 4:3], 1024x768 @ 60.00Hz, progressive"

Audio is totally off.

Does anyone have any suggestion? thanks

Thank you for suggestions.

If is a cable problem I can't figure out why with 11.0.3 I could use LibreElec correctly (with those parameters I've posted on my 1st post).

The line hdmi_drive=2 which I've read is mandatory for Raspberry as for video resolution as for audio out, I my 11.0.6 case does not work.

Wow, I didn't know, thank you!

In facts I've added on cmdline.txt the code video=HDMI-A-1:1920x1080M@60 and now tvservice -s results state 0x6 [DVI CUSTOM RGB full 16:9], 1920x1080 @ 60.00Hz, progressive which is good, but audio still doesn't work.

Do you have any idea on how to change DVImode to HDMImode using cmdline.txt ?

I've made several tests (changing from kms to fkms driver, changing HDMI port, changing parameters of config.txt distroconfig.txt cmdline.txt) but my audio doesn't sound at all: I think because I cannot change DVImode to HDMImode.

I'm back with a brand new 4k cable: you were right, it works properly now.

I still don't know why my old cable used to work with 11.0.3, but I've found the solution.

Thank you again