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Date:      Thu, 19 Nov 2020 09:38:54 -0500
From:      "James B. Byrne" <>
Subject:   Firefox - No audio
Message-ID:  <>

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I have a system that has only basic VGA video on board and requires a separate
video card for anything else.  The card installed is an Nvidia.  I had to
switch the card from interrupt to polling in order to get a stable video player
in Firefox.  But now Firefox provides no audio.

On the same system both MPlayer and Chromium handle audio and video without
problem.  But these also worked before I switched from interrupt to polling.

The sysctl settings are:

sysctl -a | grep snd
device	snd_cmi
device	snd_csa
device	snd_emu10kx
device	snd_es137x
device	snd_hda
device	snd_ich
device	snd_via8233
hw.snd.maxautovchans: 16
hw.snd.default_unit: 2
hw.snd.version: 2009061500/amd64
hw.snd.default_auto: 1
hw.snd.verbose: 0
hw.snd.vpc_mixer_bypass: 1
hw.snd.feeder_rate_quality: 1
hw.snd.feeder_rate_round: 25
hw.snd.feeder_rate_max: 2016000
hw.snd.feeder_rate_min: 1
hw.snd.feeder_rate_polyphase_max: 183040
hw.snd.feeder_rate_presets: 100:8:0.85 100:36:0.92 100:164:0.97
hw.snd.feeder_eq_exact_rate: 0
hw.snd.basename_clone: 1
hw.snd.compat_linux_mmap: 0
hw.snd.syncdelay: -1
hw.snd.usefrags: 0
hw.snd.vpc_reset: 0
hw.snd.vpc_0db: 45
hw.snd.vpc_autoreset: 1
hw.snd.timeout: 5
hw.snd.latency_profile: 1
hw.snd.latency: 2
hw.snd.report_soft_matrix: 1
hw.snd.report_soft_formats: 1

sysctl -a | grep hdac
irq264: hdac0:143 @cpu0(domain0): 2412
irq282: hdac1:179 @cpu0(domain0): 57
dev.hdaa.1.%parent: hdacc1
dev.hdaa.0.%parent: hdacc0
dev.hdacc.1.%parent: hdac1
dev.hdacc.1.%pnpinfo: vendor=0x10ec device=0x0892 revision=0x03 stepping=0x02
dev.hdacc.1.%location: cad=0
dev.hdacc.1.%driver: hdacc
dev.hdacc.1.%desc: Realtek ALC892 HDA CODEC
dev.hdacc.0.%parent: hdac0
dev.hdacc.0.%pnpinfo: vendor=0x10de device=0x0051 revision=0x01 stepping=0x00
dev.hdacc.0.%location: cad=0
dev.hdacc.0.%driver: hdacc
dev.hdacc.0.%desc: NVIDIA (0x0051) HDA CODEC
dev.hdac.1.polling: 1
dev.hdac.1.pindump: 0
dev.hdac.1.%parent: pci12
dev.hdac.1.%pnpinfo: vendor=0x1022 device=0x1457 subvendor=0x1849
subdevice=0x7893 class=0x040300
dev.hdac.1.%location: slot=0 function=3 dbsf=pci0:12:0:3
dev.hdac.1.%driver: hdac
dev.hdac.1.%desc: AMD (0x1457) HDA Controller
dev.hdac.0.polling: 0
dev.hdac.0.pindump: 0
dev.hdac.0.%parent: pci10
dev.hdac.0.%pnpinfo: vendor=0x10de device=0x0e0f subvendor=0x3842
subdevice=0x3733 class=0x040300
dev.hdac.0.%location: slot=0 function=1 dbsf=pci0:10:0:1
dev.hdac.0.%driver: hdac
dev.hdac.0.%desc: NVIDIA (0x0e0f) HDA Controller

Can anyone shed some light as to why Firefox, and apparently only Firefox, has
such difficulties with the Nvida setup?  And provide some guidance on how to
deal with them.

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James B. Byrne      
Harte & Lyne Limited
9 Brockley Drive              vox: +1 905 561 1241
Hamilton, Ontario             fax: +1 905 561 0757
Canada  L8E 3C3

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