Additionally was suggested to change hdmi_group=1 and add hdmi_mode=4.
Unfortunately, still no sound from Onkyo AVR speakers. Resulting config.txt below:
disable_splash=1
disable_overscan=1
hdmi_drive=2
hdmi_blanking=0
hdmi_force_edid_audio=1
hdmi_force_hotplug=1
hdmi_group=1
hdmi_mode=4
config_hdmi_boost=5
dtparam=i2c_arm=on
dtparam=i2s=on
dtparam=audio=on
#dtoverlay=disable-wifi
#dtoverlay=disable-bt
enable_uart=1
Unfortunately, still no sound from Onkyo AVR speakers. Resulting config.txt below:
disable_splash=1
disable_overscan=1
hdmi_drive=2
hdmi_blanking=0
hdmi_force_edid_audio=1
hdmi_force_hotplug=1
hdmi_group=1
hdmi_mode=4
config_hdmi_boost=5
dtparam=i2c_arm=on
dtparam=i2s=on
dtparam=audio=on
#dtoverlay=disable-wifi
#dtoverlay=disable-bt
enable_uart=1