Here is the config.txt file...
# SPDX-License-Identifier: GPL-2.0-or-later
# Copyright (C) 2009-2014 Stephan Raue ([email protected])
# Copyright (C) 2016-present Team LibreELEC (LibreELEC – Just enough OS for KODI)
################################################################################
# Bootloader configuration
# config.txt version v1 (do not remove or change this line!)
################################################################################
# For more options and information see
# config.txt - Raspberry Pi Documentation
################################################################################
# Default GPU memory split, 76MB are needed for H264 decoder
gpu_mem=76
# Don't send initial active source message.
# Avoids bringing CEC (enabled TV) out of standby and channel switch when
# rebooting.
hdmi_ignore_cec_init=1
################################################################################
# Include distribution specific config file if it exists.
################################################################################
[all]
include distroconfig.txt
# uncomment to enable infrared remote recevier connected to GPIO 18
#dtoverlay=gpio-ir,gpio_pin=18
dtoverlay=vc4-kms-dsi-7inch
# test
Here is also the distroconfig.txt file with the change I referred to...
# SPDX-License-Identifier: GPL-2.0-or-later
# Copyright (C) 2019-present Team LibreELEC (LibreELEC – Just enough OS for KODI)
# WARNING: DO NOT EDIT THIS FILE - IT WILL BE OVERWRITTEN WHEN UPGRADING!
dtoverlay=vc4-kms-v3d-pi4,cma-512
dtoverlay=rpivid-v4l2
disable_overscan=1
disable_fw_kms_setup=1
Also from doing further testing, I'm noticing that the touchscreen showing a display in the test build is intermittent. Sometimes on startup, it works fine. Sometimes on startup, the display looks pixelated when the test build has reached the screen with the options for music, pictures, video, etc. And sometimes on startup, there is no display. I haven't been able to find a pattern to any of it that I can replicate.