My sound output device keeps changing from my desired selection of "alsa_output.usb-Bose_Corporation_Bose_USB_Audio-00.analog-surround-50" to "alsa_output.pci-0000_01_00.1.hdmi-stereo-extra4".
I have already specified that I want the Bose device to be the default audio sink via set-default-sink (see the asterisk):
2 sink(s) available.
* index: 42
name: <alsa_output.usb-Bose_Corporation_Bose_USB_Audio-00.analog-surround-50>
driver: <module-alsa-card.c>
flags: HARDWARE HW_MUTE_CTRL HW_VOLUME_CTRL DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY
state: RUNNING
suspend cause: (none)
priority: 9049
volume: front-left: 0 / 0% / -inf dB, front-right: 0 / 0% / -inf dB, rear-left: 25754 / 39% / -24.34 dB, rear-right: 0 / 0% / -inf dB, front-center: 0 / 0% / -inf dB
balance -1.00
base volume: 65687 / 100% / 0.06 dB
volume steps: 65537
muted: no
current latency: 23.27 ms
max request: 10 KiB
max rewind: 10 KiB
monitor source: 44
sample spec: s16le 5ch 48000Hz
channel map: front-left,front-right,rear-left,rear-right,front-center
Surround 5.0
used by: 1
linked by: 1
configured latency: 23.22 ms; range is 0.50 .. 1820.44 ms
card: 6 <alsa_card.usb-Bose_Corporation_Bose_USB_Audio-00>
module: 29
properties:
alsa.resolution_bits = "16"
device.api = "alsa"
device.class = "sound"
alsa.class = "generic"
alsa.subclass = "generic-mix"
alsa.name = "USB Audio"
alsa.id = "USB Audio"
alsa.subdevice = "0"
alsa.subdevice_name = "subdevice #0"
alsa.device = "0"
alsa.card = "2"
alsa.card_name = "Bose USB Audio"
alsa.long_card_name = "Bose Corporation Bose USB Audio at usb-0000:00:14.0-10, full speed"
alsa.driver_name = "snd_usb_audio"
device.bus_path = "pci-0000:00:14.0-usb-0:10:1.0"
sysfs.path = "/devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.0/sound/card2"
udev.id = "usb-Bose_Corporation_Bose_USB_Audio-00"
device.bus = "usb"
device.vendor.id = "05a7"
device.vendor.name = "Bose Corp."
device.product.id = "1020"
device.product.name = "Bose USB Audio"
device.serial = "Bose_Corporation_Bose_USB_Audio"
device.string = "surround50:2"
device.buffering.buffer_size = "873810"
device.buffering.fragment_size = "436900"
device.access_mode = "mmap+timer"
device.profile.name = "analog-surround-50"
device.profile.description = "Analog Surround 5.0"
device.description = "Bose USB Audio Analog Surround 5.0"
alsa.mixer_name = "USB Mixer"
alsa.components = "USB05a7:1020"
module-udev-detect.discovered = "1"
device.icon_name = "audio-card-usb"
ports:
analog-output: Analog Output (priority 9900, latency offset 0 usec, available: unknown)
properties:
active port: <analog-output>
index: 68
name: <alsa_output.pci-0000_01_00.1.hdmi-stereo-extra4>
driver: <module-alsa-card.c>
flags: HARDWARE DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY
state: SUSPENDED
suspend cause: IDLE
priority: 9030
volume: front-left: 12074 / 18% / -44.08 dB, front-right: 12074 / 18% / -44.08 dB
balance 0.00
base volume: 65536 / 100% / 0.00 dB
volume steps: 65537
muted: no
current latency: 0.00 ms
max request: 0 KiB
max rewind: 0 KiB
monitor source: 70
sample spec: s16le 2ch 44100Hz
channel map: front-left,front-right
Stereo
used by: 0
linked by: 0
configured latency: 0.00 ms; range is 0.50 .. 371.52 ms
card: 0 <alsa_card.pci-0000_01_00.1>
module: 7
properties:
alsa.resolution_bits = "16"
device.api = "alsa"
device.class = "sound"
alsa.class = "generic"
alsa.subclass = "generic-mix"
alsa.name = "HDMI 4"
alsa.id = "HDMI 4"
alsa.subdevice = "0"
alsa.subdevice_name = "subdevice #0"
alsa.device = "10"
alsa.card = "1"
alsa.card_name = "HD-Audio Generic"
alsa.long_card_name = "HD-Audio Generic at 0xdb560000 irq 159"
alsa.driver_name = "snd_hda_intel"
device.bus_path = "pci-0000:01:00.1"
sysfs.path = "/devices/pci0000:00/0000:00:01.0/0000:01:00.1/sound/card1"
device.bus = "pci"
device.vendor.id = "1002"
device.vendor.name = "Advanced Micro Devices, Inc. [AMD/ATI]"
device.product.id = "ab08"
device.product.name = "Polaris 22 HDMI Audio"
device.string = "hdmi:1,4"
device.buffering.buffer_size = "65536"
device.buffering.fragment_size = "32768"
device.access_mode = "mmap+timer"
device.profile.name = "hdmi-stereo-extra4"
device.profile.description = "Digital Stereo (HDMI 5)"
device.description = "Polaris 22 HDMI Audio Digital Stereo (HDMI 5)"
alsa.mixer_name = "ATI R6xx HDMI"
alsa.components = "HDA:1002aa01,00aa0100,00100700"
module-udev-detect.discovered = "1"
device.icon_name = "audio-card-pci"
ports:
hdmi-output-4: HDMI / DisplayPort 5 (priority 5500, latency offset 0 usec, available: yes)
properties:
device.icon_name = "video-display"
device.product.name = "SAMSUNG"
active port: <hdmi-output-4>
No matter what though, Ubuntu keeps switching back to the HDMI audio device at some arbitrary time. Sound continues to play through the Bose speakers but the main volume control won't change the volume. I then have change the device in Settings > Sound > Output.
Can I disable the HDMI device?
Has anyone else had this problem?
Many thanks in advance!
