[LAU] Setting HDMI as default in asoundrc and getting Firefox to use this default

Hi Wise Ones, I'm trying to set HDMI as the default output in asoundrc. I have quite a few possibilities, listed here by aplay -L hw:CARD=PCH,DEV=0 HDA Intel PCH, ALC662 rev3 Analog Direct hardware device without any conversions hw:CARD=PCH,DEV=3 HDA Intel PCH, HDMI 0 Direct hardware device without any conversions hw:CARD=PCH,DEV=7 HDA Intel PCH, HDMI 1 Direct hardware device without any conversions hw:CARD=PCH,DEV=8 HDA Intel PCH, HDMI 2 Direct hardware device without any conversions hw:CARD=PCH,DEV=9 HDA Intel PCH, HDMI 3 Direct hardware device without any conversions hw:CARD=PCH,DEV=10 HDA Intel PCH, HDMI 4 Direct hardware device without any conversions plughw:CARD=PCH,DEV=0 HDA Intel PCH, ALC662 rev3 Analog Hardware device with all software conversions plughw:CARD=PCH,DEV=3 HDA Intel PCH, HDMI 0 Hardware device with all software conversions plughw:CARD=PCH,DEV=7 HDA Intel PCH, HDMI 1 Hardware device with all software conversions plughw:CARD=PCH,DEV=8 HDA Intel PCH, HDMI 2 Hardware device with all software conversions plughw:CARD=PCH,DEV=9 HDA Intel PCH, HDMI 3 Hardware device with all software conversions plughw:CARD=PCH,DEV=10 HDA Intel PCH, HDMI 4 Hardware device with all software conversions default:CARD=PCH HDA Intel PCH, ALC662 rev3 Analog Default Audio Device sysdefault:CARD=PCH HDA Intel PCH, ALC662 rev3 Analog Default Audio Device front:CARD=PCH,DEV=0 HDA Intel PCH, ALC662 rev3 Analog Front output / input surround21:CARD=PCH,DEV=0 HDA Intel PCH, ALC662 rev3 Analog 2.1 Surround output to Front and Subwoofer speakers surround40:CARD=PCH,DEV=0 HDA Intel PCH, ALC662 rev3 Analog 4.0 Surround output to Front and Rear speakers surround41:CARD=PCH,DEV=0 HDA Intel PCH, ALC662 rev3 Analog 4.1 Surround output to Front, Rear and Subwoofer speakers surround50:CARD=PCH,DEV=0 HDA Intel PCH, ALC662 rev3 Analog 5.0 Surround output to Front, Center and Rear speakers surround51:CARD=PCH,DEV=0 HDA Intel PCH, ALC662 rev3 Analog 5.1 Surround output to Front, Center, Rear and Subwoofer speakers surround71:CARD=PCH,DEV=0 HDA Intel PCH, ALC662 rev3 Analog 7.1 Surround output to Front, Center, Side, Rear and Woofer speakers hdmi:CARD=PCH,DEV=0 HDA Intel PCH, HDMI 0 HDMI Audio Output hdmi:CARD=PCH,DEV=1 HDA Intel PCH, HDMI 1 HDMI Audio Output hdmi:CARD=PCH,DEV=2 HDA Intel PCH, HDMI 2 HDMI Audio Output hdmi:CARD=PCH,DEV=3 HDA Intel PCH, HDMI 3 HDMI Audio Output hdmi:CARD=PCH,DEV=4 HDA Intel PCH, HDMI 4 HDMI Audio Output dmix:CARD=PCH,DEV=0 HDA Intel PCH, ALC662 rev3 Analog Direct sample mixing device dmix:CARD=PCH,DEV=3 HDA Intel PCH, HDMI 0 Direct sample mixing device dmix:CARD=PCH,DEV=7 HDA Intel PCH, HDMI 1 Direct sample mixing device dmix:CARD=PCH,DEV=8 HDA Intel PCH, HDMI 2 Direct sample mixing device dmix:CARD=PCH,DEV=9 HDA Intel PCH, HDMI 3 Direct sample mixing device dmix:CARD=PCH,DEV=10 HDA Intel PCH, HDMI 4 Direct sample mixing device By trial-and-error (how else to do it?) I find the following commands generate audio output to a TV connected via HDMI. aplay -D plughw:CARD=PCH,DEV=7 ~/music/tmh.wav aplay -D hw:CARD=PCH,DEV=7 ~/music/tmh.wav I would prefer a setting with dmix, but the following fails: aplay -D dmix:CARD=PCH,DEV=7 Playing WAVE '/home/jroth/music/tmh.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo aplay: set_params:1343: Sample format non available Available formats: - S32_LE Attempting to translate a working example to asoundrc, I find aplay (without -D option) produces sound output at the TV with the following: pcm.!default { type hw card 0 device 7 } However even after restarting firefox, it doesn't play to this output. I tried adding a ctl stanza: ctl.!default { type hw card 0 device 7 } This doesn't affect aplay, but firefox doesn't output to headphones or HDMI with this setting in asoundrc. I welcome any suggestions to get firefox to default to the asoundrc setting. TIA, Joel -- Joel Roth