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no sound from jack, alsamixer "cannot load mixer controls: Input/output error"

DAC+ on rpi2 running a "Satellite CCRMA" image that I've invested a fair amount of time in configuring otherwise, so I would greatly prefer to get this working rather than start from scratch on another image.

 

I verified with the test image that the hardware is working (I hear the test tone).

 

On my image, configured per https://www.hifiberry.com/guides/configuring-linux-3-18-x/

 

ccrma@satellite ~/rpi_bkup $ ./check-system.dac
Checking system

Linux satellite 3.18.11-v7+ #781 SMP PREEMPT Tue Apr 21 18:07:59 BST 2015 armv7l GNU/Linux
Kernel: 3.18.11-v7+
PRETTY_NAME="Raspbian GNU/Linux 7 (wheezy)"
NAME="Raspbian GNU/Linux"
VERSION_ID="7"
VERSION="7 (wheezy)"
ID=raspbian
ID_LIKE=debian
ANSI_COLOR="1;31"
HOME_URL="http://www.raspbian.org/"
SUPPORT_URL="http://www.raspbian.org/RaspbianForums"
BUG_REPORT_URL="http://www.raspbian.org/RaspbianBugs"


bcm2708_dmaengine module not loaded
snd_soc_pcm5102a module not loaded
module file /lib/modules/3.18.11-v7+/kernel/drivers/dma/bcm2708-dmaengine.ko not found
Sound cards
**** List of PLAYBACK Hardware Devices ****
card 0: sndrpihifiberry [snd_rpi_hifiberry_dacplus], device 0: HiFiBerry DAC+ HiFi pcm512x-hifi-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0
Playing WAVE 'sin1000_48khz.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo

 

but no sound is heard from the jack. Furthermore

 

ccrma@satellite ~/rpi_bkup $ alsamixer
cannot load mixer controls: Input/output error

 

ccrma@satellite ~/rpi_bkup $ sudo amixer sset 'PCM' 96%
amixer: Mixer default load error: Input/output error

 

etc

 

dmesg includes:

 

[ 2.681772] udevd[174]: starting version 175
[ 3.233339] bcm2708_i2c_init_pinmode(1,2)
[ 3.238839] bcm2708_i2c_init_pinmode(1,3)
[ 3.602423] snd-rpi-hifiberry-dacplus sound: ASoC: CPU DAI (null) not registered
[ 3.607147] snd-rpi-hifiberry-dacplus sound: snd_soc_register_card() failed: -517
[ 3.611565] platform sound: Driver snd-rpi-hifiberry-dacplus requests probe deferral
[ 3.623274] pcm512x 1-004d: No SCLK, using BCLK: -2
[ 3.688473] snd-rpi-hifiberry-dacplus sound: ASoC: CPU DAI (null) not registered
[ 3.693358] snd-rpi-hifiberry-dacplus sound: snd_soc_register_card() failed: -517
[ 3.694191] bcm2708_i2c 3f804000.i2c: BSC1 Controller at 0x3f804000 (irq 79) (baudrate 100000)
[ 3.702741] platform sound: Driver snd-rpi-hifiberry-dacplus requests probe deferral
[ 3.719249] snd-rpi-hifiberry-dacplus sound: pcm512x-hifi <-> 3f203000.i2s mapping ok
[ 5.568436] EXT4-fs (mmcblk0p6): re-mounted. Opts: (null)
[ 10.269397] random: nonblocking pool is initialized
[ 10.271033] smsc95xx 1-1.1:1.0 eth0: hardware isn't capable of remote wakeup
[ 11.866468] smsc95xx 1-1.1:1.0 eth0: link up, 100Mbps, full-duplex, lpa 0xCDE1
[ 20.977862] EXT4-fs (mmcblk0p6): re-mounted. Opts: (null)
[ 41.453448] pcm512x 1-004d: Failed to remove standby: -5
[ 41.453472] pcm512x 1-004d: ASoC: Failed to turn on bias: -5
[ 46.459713] pcm512x 1-004d: Failed to request standby: -5
[ 46.459739] pcm512x 1-004d: ASoC: Failed to turn off bias: -5
[ 215.972861] pcm512x 1-004d: Failed to remove standby: -5
[ 215.972884] pcm512x 1-004d: ASoC: Failed to turn on bias: -5
[ 250.990036] pcm512x 1-004d: Failed to request standby: -5
[ 250.990056] pcm512x 1-004d: ASoC: Failed to turn off bias: -5

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