That did the trick! Thank you very much. I saw that option in the raspberrypi.org documentation but did not think that this could be relevant for me.
Posts by dcea
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I installed libreelec on my RPI4 2GB and I just can't get hdmi_force_hotplug=1 to work. The raspberry is connected to an AVR. Original power supply and hdmi connecter are used.
My config.txt looks as follows:
Code
Display More# Copyright (C) 2009-2014 Stephan Raue ([email protected]) # Copyright (C) 2016-present Team LibreELEC (https://libreelec.tv) ################################################################################ # Bootloader configuration - config.txt ################################################################################ ################################################################################ # Memory (System/GPU configuration ) ################################################################################ # Default GPU memory split - at least 288M is needed for some 4k HEVC files gpu_mem=320 ################################################################################ # For overclocking and various other settings, see: # https://www.raspberrypi.org/documentation/configuration/config-txt.md ################################################################################ # Set 'force_turbo=1' to disable dynamic overclocking and enable overclocking always. force_turbo=0 # Force HDMI even if unplugged or powered off #hdmi_force_hotplug=1 # Doesn't sent initial active source message. # Avoids bringing CEC (enabled TV) out of standby and channel switch when # rebooting. hdmi_ignore_cec_init=1 ################################################################################ # End of default configuration ################################################################################ ################################################################################ # Include distribution specific config file if it exists. ################################################################################ [all] include distroconfig.txt # HDMI without active display (optional) hdmi_force_hotplug=1 # Audio over HDMI (optional) hdmi_drive=2 # CEA mode hdmi_group=1 # 1080p 60 Hz hdmi_mode=16
That way, the screen says "no signal" when the RPI is on before the AVR. hdmi_group=2 with hdmi_mode=76 also results in the same behaviour. When deleting hdmi_mode=xx it works, but the resolution is set to 1024 x 768.
Without any hdmi_group entry the raspberry boots (while AVR on) with 1080p 60 Hz. So this should be the right resolution.
I can't find a solution and I do not know any more.