I am having a bit of trouble getting alsa to play nicely with my snd_loopback.
before starting I enabled snd_aloop but with a basic setup like this: pcm.!default { type hw card 1 } ctl.!default { type hw card 1 } audio plays from the browser but not from jackd. I was following this guide: https://www.linuxmusicians.com/viewtopic.php?f=19&t=2636&start=15#p11943 i setup my .asoundrc file like this following the guide pcm.loopmix { type dmix ipc_key 219345 # any unique number here slave.pcm "hw:Loopback,0,0" } pcm.loopsnoop { type dsnoop ipc_key 219346 # any unique number here slave.pcm "hw:Loopback,1,1" } pcm.combo { type asym playback.pcm "loopmix" capture.pcm "loopsnoop" } # this makes native ALSA apps default to using dmix pcm.!default { type plug slave.pcm "combo" } ctl.!default { type hw card Loopback } restarted then called these commands: alsa_in -j cloop -dhw:Loopback,1,0 alsa_out -j ploop -dhw:Loopback,0,1 after doing that I see the alsa_in and alsa_out links in jack routing table but connecting them does nothing. There's still no audio output. I am using QasMixer and all volumes are maxed out, if I cross system input to output i get feedback so that part works. aplay -l -------------------------------------------- **** List of PLAYBACK Hardware Devices **** card 0: Loopback [Loopback], device 0: Loopback PCM [Loopback PCM] Subdevices: 8/8 Subdevice #0: subdevice #0 Subdevice #1: subdevice #1 Subdevice #2: subdevice #2 Subdevice #3: subdevice #3 Subdevice #4: subdevice #4 Subdevice #5: subdevice #5 Subdevice #6: subdevice #6 Subdevice #7: subdevice #7 card 0: Loopback [Loopback], device 1: Loopback PCM [Loopback PCM] Subdevices: 8/8 Subdevice #0: subdevice #0 Subdevice #1: subdevice #1 Subdevice #2: subdevice #2 Subdevice #3: subdevice #3 Subdevice #4: subdevice #4 Subdevice #5: subdevice #5 Subdevice #6: subdevice #6 Subdevice #7: subdevice #7 card 1: PCH [HDA Intel PCH], device 0: CS4208 Analog [CS4208 Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 card 1: PCH [HDA Intel PCH], device 1: CS4208 Digital [CS4208 Digital] Subdevices: 1/1 Subdevice #0: subdevice #0 card 2: NVidia [HDA NVidia], device 3: HDMI 0 [HDMI 0] Subdevices: 1/1 Subdevice #0: subdevice #0 card 2: NVidia [HDA NVidia], device 7: HDMI 1 [HDMI 1] Subdevices: 1/1 Subdevice #0: subdevice #0 card 2: NVidia [HDA NVidia], device 8: HDMI 2 [HDMI 2] Subdevices: 1/1 Subdevice #0: subdevice #0 -------------------------------------------- aplay -L -------------------------------------------- null Discard all samples (playback) or generate zero samples (capture) pulse PulseAudio Sound Server sysdefault:CARD=Loopback Loopback, Loopback PCM Default Audio Device front:CARD=Loopback,DEV=0 Loopback, Loopback PCM Front speakers surround21:CARD=Loopback,DEV=0 Loopback, Loopback PCM 2.1 Surround output to Front and Subwoofer speakers surround40:CARD=Loopback,DEV=0 Loopback, Loopback PCM 4.0 Surround output to Front and Rear speakers surround41:CARD=Loopback,DEV=0 Loopback, Loopback PCM 4.1 Surround output to Front, Rear and Subwoofer speakers surround50:CARD=Loopback,DEV=0 Loopback, Loopback PCM 5.0 Surround output to Front, Center and Rear speakers surround51:CARD=Loopback,DEV=0 Loopback, Loopback PCM 5.1 Surround output to Front, Center, Rear and Subwoofer speakers surround71:CARD=Loopback,DEV=0 Loopback, Loopback PCM 7.1 Surround output to Front, Center, Side, Rear and Woofer speakers dmix:CARD=Loopback,DEV=0 Loopback, Loopback PCM Direct sample mixing device dmix:CARD=Loopback,DEV=1 Loopback, Loopback PCM Direct sample mixing device dsnoop:CARD=Loopback,DEV=0 Loopback, Loopback PCM Direct sample snooping device dsnoop:CARD=Loopback,DEV=1 Loopback, Loopback PCM Direct sample snooping device hw:CARD=Loopback,DEV=0 Loopback, Loopback PCM Direct hardware device without any conversions hw:CARD=Loopback,DEV=1 Loopback, Loopback PCM Direct hardware device without any conversions plughw:CARD=Loopback,DEV=0 Loopback, Loopback PCM Hardware device with all software conversions plughw:CARD=Loopback,DEV=1 Loopback, Loopback PCM Hardware device with all software conversions sysdefault:CARD=PCH HDA Intel PCH, CS4208 Analog Default Audio Device front:CARD=PCH,DEV=0 HDA Intel PCH, CS4208 Analog Front speakers surround21:CARD=PCH,DEV=0 HDA Intel PCH, CS4208 Analog 2.1 Surround output to Front and Subwoofer speakers surround40:CARD=PCH,DEV=0 HDA Intel PCH, CS4208 Analog 4.0 Surround output to Front and Rear speakers surround41:CARD=PCH,DEV=0 HDA Intel PCH, CS4208 Analog 4.1 Surround output to Front, Rear and Subwoofer speakers surround50:CARD=PCH,DEV=0 HDA Intel PCH, CS4208 Analog 5.0 Surround output to Front, Center and Rear speakers surround51:CARD=PCH,DEV=0 HDA Intel PCH, CS4208 Analog 5.1 Surround output to Front, Center, Rear and Subwoofer speakers surround71:CARD=PCH,DEV=0 HDA Intel PCH, CS4208 Analog 7.1 Surround output to Front, Center, Side, Rear and Woofer speakers iec958:CARD=PCH,DEV=0 HDA Intel PCH, CS4208 Digital IEC958 (S/PDIF) Digital Audio Output dmix:CARD=PCH,DEV=0 HDA Intel PCH, CS4208 Analog Direct sample mixing device dmix:CARD=PCH,DEV=1 HDA Intel PCH, CS4208 Digital Direct sample mixing device dsnoop:CARD=PCH,DEV=0 HDA Intel PCH, CS4208 Analog Direct sample snooping device dsnoop:CARD=PCH,DEV=1 HDA Intel PCH, CS4208 Digital Direct sample snooping device hw:CARD=PCH,DEV=0 HDA Intel PCH, CS4208 Analog Direct hardware device without any conversions hw:CARD=PCH,DEV=1 HDA Intel PCH, CS4208 Digital Direct hardware device without any conversions plughw:CARD=PCH,DEV=0 HDA Intel PCH, CS4208 Analog Hardware device with all software conversions plughw:CARD=PCH,DEV=1 HDA Intel PCH, CS4208 Digital Hardware device with all software conversions hdmi:CARD=NVidia,DEV=0 HDA NVidia, HDMI 0 HDMI Audio Output hdmi:CARD=NVidia,DEV=1 HDA NVidia, HDMI 1 HDMI Audio Output hdmi:CARD=NVidia,DEV=2 HDA NVidia, HDMI 2 HDMI Audio Output dmix:CARD=NVidia,DEV=3 HDA NVidia, HDMI 0 Direct sample mixing device dmix:CARD=NVidia,DEV=7 HDA NVidia, HDMI 1 Direct sample mixing device dmix:CARD=NVidia,DEV=8 HDA NVidia, HDMI 2 Direct sample mixing device dsnoop:CARD=NVidia,DEV=3 HDA NVidia, HDMI 0 Direct sample snooping device dsnoop:CARD=NVidia,DEV=7 HDA NVidia, HDMI 1 Direct sample snooping device dsnoop:CARD=NVidia,DEV=8 HDA NVidia, HDMI 2 Direct sample snooping device hw:CARD=NVidia,DEV=3 HDA NVidia, HDMI 0 Direct hardware device without any conversions hw:CARD=NVidia,DEV=7 HDA NVidia, HDMI 1 Direct hardware device without any conversions hw:CARD=NVidia,DEV=8 HDA NVidia, HDMI 2 Direct hardware device without any conversions plughw:CARD=NVidia,DEV=3 HDA NVidia, HDMI 0 Hardware device with all software conversions plughw:CARD=NVidia,DEV=7 HDA NVidia, HDMI 1 Hardware device with all software conversions plughw:CARD=NVidia,DEV=8 HDA NVidia, HDMI 2 Hardware device with all software conversions -------------------------------------------- cat /proc/asound/cards -------------------------------------------- 0 [Loopback ]: Loopback - Loopback Loopback 1 1 [PCH ]: HDA-Intel - HDA Intel PCH HDA Intel PCH at 0xc1e14000 irq 50 2 [NVidia ]: HDA-Intel - HDA NVidia HDA NVidia at 0xc1080000 irq 17 -------------------------------------------- cat /proc/modules | grep snd -------------------------------------------- snd_hda_codec_hdmi 45118 1 - Live 0xffffffffa156b000 snd_hda_codec_cirrus 17637 1 - Live 0xffffffffa041a000 snd_hda_codec_generic 63181 1 snd_hda_codec_cirrus, Live 0xffffffffa044c000 snd_hda_intel 26327 2 - Live 0xffffffffa0312000 snd_hda_controller 26646 1 snd_hda_intel, Live 0xffffffffa02c1000 snd_hda_codec 104500 5 snd_hda_codec_hdmi,snd_hda_codec_cirrus,snd_hda_codec_generic,snd_hda_intel,snd_hda_controller, Live 0xffffffffa028b000 snd_hwdep 13148 1 snd_hda_codec, Live 0xffffffffa0320000 snd_aloop 18131 0 - Live 0xffffffffa024c000 snd_pcm 88662 5 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_controller,snd_hda_codec,snd_aloop, Live 0xffffffffa022a000 snd_seq_midi 12848 0 - Live 0xffffffffa0225000 snd_seq_midi_event 13316 1 snd_seq_midi, Live 0xffffffffa01ee000 snd_seq 57061 2 snd_seq_midi,snd_seq_midi_event, Live 0xffffffffa0216000 snd_rawmidi 26806 1 snd_seq_midi, Live 0xffffffffa0209000 snd_seq_device 13132 3 snd_seq_midi,snd_seq,snd_rawmidi, Live 0xffffffffa0204000 snd_timer 26614 2 snd_pcm,snd_seq, Live 0xffffffffa01e6000 snd 65244 16 snd_hda_codec_hdmi,snd_hda_codec_cirrus,snd_hda_codec_generic,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_aloop,snd_pcm,snd_seq,snd_rawmidi,snd_seq_device,snd_timer, Live 0xffffffffa01f3000 soundcore 13026 2 snd_hda_codec,snd, Live 0xffffffffa01ca000 I've been reading the asoundrc documentation but I am still a bit confused. can anyone on this mailing list help me sort this out?
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