我最近开始使用 Jabra USB 耳机，一切都很好，除了每当我使用麦克风时它就会降低音质，然后在不使用麦克风 3 秒后它就会恢复正常。
它发生在以下情况：
- Gnome 的声音设置已打开
- 我开始在游戏中使用麦克风
- OBS已开通
- ETC。
当降级发生时我注意到以下情况syslog（此示例来自启动声音设置）：
May 21 18:30:15 pc dbus-daemon[7017]: [session uid=1000 pid=7017] Activating service name='org.gnome.ControlCenter.SearchProvider' requested by ':1.21' (uid=1000 pid=7176 comm="/usr/bin/gnome-shell " label="unconfined")
May 21 18:30:15 pc dbus-daemon[7017]: [session uid=1000 pid=7017] Activating service name='org.gnome.Nautilus' requested by ':1.21' (uid=1000 pid=7176 comm="/usr/bin/gnome-shell " label="unconfined")
May 21 18:30:15 pc systemd[6867]: Starting GNOME Terminal Server...
May 21 18:30:15 pc dbus-daemon[7017]: [session uid=1000 pid=7017] Activating service name='org.gnome.seahorse.Application' requested by ':1.21' (uid=1000 pid=7176 comm="/usr/bin/gnome-shell " label="unconfined")
May 21 18:30:15 pc dbus-daemon[7017]: [session uid=1000 pid=7017] Activating via systemd: service name='org.gnome.Terminal' unit='gnome-terminal-server.service' requested by ':1.21' (uid=1000 pid=7176 comm="/usr/bin/gnome-shell " label="unconfined")
May 21 18:30:15 pc dbus-daemon[7017]: [session uid=1000 pid=7017] Successfully activated service 'org.gnome.ControlCenter.SearchProvider'
May 21 18:30:15 pc dbus-daemon[7017]: [session uid=1000 pid=7017] Successfully activated service 'org.gnome.Nautilus'
May 21 18:30:15 pc dbus-daemon[7017]: [session uid=1000 pid=7017] Successfully activated service 'org.gnome.seahorse.Application'
May 21 18:30:15 pc org.gnome.Nautilus[7017]: Initializing nautilus-image-converter extension
May 21 18:30:15 pc nautilus[24808]: g_key_file_load_from_file: assertion 'file != NULL' failed
May 21 18:30:15 pc nautilus[24808]: Could not establish a connection to Tracker: Failed to load SPARQL backend: Key file does not have group “DomainOntology”
May 21 18:30:15 pc dbus-daemon[7017]: [session uid=1000 pid=7017] Successfully activated service 'org.gnome.Terminal'
May 21 18:30:15 pc systemd[6867]: Started GNOME Terminal Server.
May 21 18:30:15 pc nautilus[24808]: g_queue_pop_head: assertion 'queue != NULL' failed
May 21 18:30:15 pc nautilus[24808]: g_queue_foreach: assertion 'queue != NULL' failed
May 21 18:30:15 pc nautilus[24808]: g_queue_free: assertion 'queue != NULL' failed
May 21 18:30:15 pc nautilus[24808]: g_queue_pop_head: assertion 'queue != NULL' failed
May 21 18:30:16 pc /usr/lib/gdm3/gdm-x-session[7009]: (--) NVIDIA(GPU-0): DFP-0: disconnected
May 21 18:30:16 pc /usr/lib/gdm3/gdm-x-session[7009]: (--) NVIDIA(GPU-0): DFP-0: Internal TMDS
May 21 18:30:16 pc /usr/lib/gdm3/gdm-x-session[7009]: (--) NVIDIA(GPU-0): DFP-0: 330.0 MHz maximum pixel clock
May 21 18:30:16 pc /usr/lib/gdm3/gdm-x-session[7009]: (--) NVIDIA(GPU-0):
May 21 18:30:16 pc /usr/lib/gdm3/gdm-x-session[7009]: (--) NVIDIA(GPU-0): DFP-1: disconnected
May 21 18:30:16 pc /usr/lib/gdm3/gdm-x-session[7009]: (--) NVIDIA(GPU-0): DFP-1: Internal TMDS
May 21 18:30:16 pc /usr/lib/gdm3/gdm-x-session[7009]: (--) NVIDIA(GPU-0): DFP-1: 165.0 MHz maximum pixel clock
May 21 18:30:16 pc /usr/lib/gdm3/gdm-x-session[7009]: (--) NVIDIA(GPU-0):
May 21 18:30:16 pc /usr/lib/gdm3/gdm-x-session[7009]: (--) NVIDIA(GPU-0): DFP-2: disconnected
May 21 18:30:16 pc /usr/lib/gdm3/gdm-x-session[7009]: (--) NVIDIA(GPU-0): DFP-2: Internal TMDS
May 21 18:30:16 pc /usr/lib/gdm3/gdm-x-session[7009]: (--) NVIDIA(GPU-0): DFP-2: 165.0 MHz maximum pixel clock
May 21 18:30:16 pc /usr/lib/gdm3/gdm-x-session[7009]: (--) NVIDIA(GPU-0):
May 21 18:30:16 pc /usr/lib/gdm3/gdm-x-session[7009]: (--) NVIDIA(GPU-0): DELL U2312HM (DFP-3): connected
May 21 18:30:16 pc /usr/lib/gdm3/gdm-x-session[7009]: (--) NVIDIA(GPU-0): DELL U2312HM (DFP-3): Internal DisplayPort
May 21 18:30:16 pc /usr/lib/gdm3/gdm-x-session[7009]: (--) NVIDIA(GPU-0): DELL U2312HM (DFP-3): 1440.0 MHz maximum pixel clock
May 21 18:30:16 pc /usr/lib/gdm3/gdm-x-session[7009]: (--) NVIDIA(GPU-0):
May 21 18:30:16 pc /usr/lib/gdm3/gdm-x-session[7009]: (--) NVIDIA(GPU-0): DFP-4: disconnected
May 21 18:30:16 pc /usr/lib/gdm3/gdm-x-session[7009]: (--) NVIDIA(GPU-0): DFP-4: Internal TMDS
May 21 18:30:16 pc /usr/lib/gdm3/gdm-x-session[7009]: (--) NVIDIA(GPU-0): DFP-4: 165.0 MHz maximum pixel clock
May 21 18:30:16 pc /usr/lib/gdm3/gdm-x-session[7009]: (--) NVIDIA(GPU-0):
May 21 18:30:16 pc /usr/lib/gdm3/gdm-x-session[7009]: (--) NVIDIA(GPU-0): DFP-5: disconnected
May 21 18:30:16 pc /usr/lib/gdm3/gdm-x-session[7009]: (--) NVIDIA(GPU-0): DFP-5: Internal DisplayPort
May 21 18:30:16 pc /usr/lib/gdm3/gdm-x-session[7009]: (--) NVIDIA(GPU-0): DFP-5: 1440.0 MHz maximum pixel clock
May 21 18:30:16 pc /usr/lib/gdm3/gdm-x-session[7009]: (--) NVIDIA(GPU-0):
May 21 18:30:16 pc /usr/lib/gdm3/gdm-x-session[7009]: (--) NVIDIA(GPU-0): DFP-6: disconnected
May 21 18:30:16 pc /usr/lib/gdm3/gdm-x-session[7009]: (--) NVIDIA(GPU-0): DFP-6: Internal TMDS
May 21 18:30:16 pc /usr/lib/gdm3/gdm-x-session[7009]: (--) NVIDIA(GPU-0): DFP-6: 165.0 MHz maximum pixel clock
May 21 18:30:16 pc /usr/lib/gdm3/gdm-x-session[7009]: (--) NVIDIA(GPU-0):
May 21 18:30:16 pc nautilus[24808]: g_queue_foreach: assertion 'queue != NULL' failed
May 21 18:30:16 pc nautilus[24808]: g_queue_free: assertion 'queue != NULL' failed
May 21 18:30:16 pc gnome-control-c[24856]: Couldn't find a stream from the active input
May 21 18:30:35 pc dbus-daemon[7017]: [session uid=1000 pid=7017] Activating service name='org.gnome.Nautilus' requested by ':1.21' (uid=1000 pid=7176 comm="/usr/bin/gnome-shell " label="unconfined")
May 21 18:30:35 pc dbus-daemon[7017]: [session uid=1000 pid=7017] Activating via systemd: service name='org.gnome.Terminal' unit='gnome-terminal-server.service' requested by ':1.21' (uid=1000 pid=7176 comm="/usr/bin/gnome-shell " label="unconfined")
May 21 18:30:35 pc systemd[6867]: Starting GNOME Terminal Server...
May 21 18:30:35 pc dbus-daemon[7017]: [session uid=1000 pid=7017] Successfully activated service 'org.gnome.Nautilus'
May 21 18:30:35 pc org.gnome.Nautilus[7017]: Initializing nautilus-image-converter extension
May 21 18:30:35 pc nautilus[24907]: g_key_file_load_from_file: assertion 'file != NULL' failed
May 21 18:30:35 pc nautilus[24907]: Could not establish a connection to Tracker: Failed to load SPARQL backend: Key file does not have group “DomainOntology”
May 21 18:30:35 pc dbus-daemon[7017]: [session uid=1000 pid=7017] Successfully activated service 'org.gnome.Terminal'
May 21 18:30:35 pc systemd[6867]: Started GNOME Terminal Server.
May 21 18:30:35 pc nautilus[24907]: g_queue_pop_head: assertion 'queue != NULL' failed
May 21 18:30:35 pc nautilus[24907]: g_queue_foreach: assertion 'queue != NULL' failed
May 21 18:30:35 pc nautilus[24907]: g_queue_free: assertion 'queue != NULL' failed
May 21 18:30:35 pc nautilus[24907]: g_queue_pop_head: assertion 'queue != NULL' failed
May 21 18:30:42 pc nautilus[24907]: g_queue_foreach: assertion 'queue != NULL' failed
May 21 18:30:42 pc nautilus[24907]: g_queue_free: assertion 'queue != NULL' failed
这是我得到的结果，alsamixer在降级/升级时不会改变：
arecord --list-devices以供参考：
**** List of CAPTURE Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC887-VD Analog [ALC887-VD Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 2: ALC887-VD Alt Analog [ALC887-VD Alt Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 2: MS [Jabra EVOLVE LINK MS], device 0: USB Audio [USB Audio]
Subdevices: 1/1
Subdevice #0: subdevice #0
降级时会变为如下所示（标记0/1Jabra 卡 2 条目旁边）：
**** List of CAPTURE Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC887-VD Analog [ALC887-VD Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 2: ALC887-VD Alt Analog [ALC887-VD Alt Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 2: MS [Jabra EVOLVE LINK MS], device 0: USB Audio [USB Audio]
Subdevices: 0/1
Subdevice #0: subdevice #0
aplay -l降级时不会改变：
**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC887-VD Analog [ALC887-VD Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 7: HDMI 1 [HDMI 1]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 8: HDMI 2 [HDMI 2]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 9: HDMI 3 [HDMI 3]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 2: MS [Jabra EVOLVE LINK MS], device 0: USB Audio [USB Audio]
Subdevices: 0/1
Subdevice #0: subdevice #0
pulseaudio --dump-conf以供参考：
### Read from configuration file: /etc/pulse/daemon.conf ###
daemonize = no
fail = yes
high-priority = yes
nice-level = -11
realtime-scheduling = yes
realtime-priority = 5
allow-module-loading = yes
allow-exit = yes
use-pid-file = yes
system-instance = no
local-server-type = user
cpu-limit = no
enable-shm = yes
flat-volumes = no
lock-memory = no
exit-idle-time = 20
scache-idle-time = 20
dl-search-path = /usr/lib/pulse-11.1/modules
default-script-file = /etc/pulse/default.pa
load-default-script-file = yes
log-target =
log-level = notice
resample-method = auto
avoid-resampling = yes
enable-remixing = yes
remixing-use-all-sink-channels = yes
enable-lfe-remixing = no
lfe-crossover-freq = 0
default-sample-format = s16le
default-sample-rate = 48000
alternate-sample-rate = 48000
default-sample-channels = 2
default-channel-map = front-left,front-right
default-fragments = 4
default-fragment-size-msec = 25
enable-deferred-volume = yes
deferred-volume-safety-margin-usec = 1
deferred-volume-extra-delay-usec = 0
shm-size-bytes = 0
log-meta = no
log-time = no
log-backtrace = 0
rlimit-fsize = -1
rlimit-data = -1
rlimit-stack = -1
rlimit-core = -1
rlimit-rss = -1
rlimit-as = -1
rlimit-nproc = -1
rlimit-nofile = 256
rlimit-memlock = -1
rlimit-locks = -1
rlimit-sigpending = -1
rlimit-msgqueue = -1
rlimit-nice = 31
rlimit-rtprio = 9
rlimit-rttime = 200000
lsusb以供参考：
Device: ID 0b0e:0305 GN Netcom
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x0b0e GN Netcom
idProduct 0x0305
bcdDevice 3.09
iManufacturer 1 GN Netcom A/S
iProduct 2 Jabra EVOLVE LINK MS
iSerial 3 0001C36F5F8208
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 280
bNumInterfaces 4
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 500mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 1 Audio
bInterfaceSubClass 1 Control Device
bInterfaceProtocol 0
iInterface 0
AudioControl Interface Descriptor:
bLength 10
bDescriptorType 36
bDescriptorSubtype 1 (HEADER)
bcdADC 1.00
wTotalLength 112
bInCollection 2
baInterfaceNr( 0) 1
baInterfaceNr( 1) 2
AudioControl Interface Descriptor:
bLength 12
bDescriptorType 36
bDescriptorSubtype 2 (INPUT_TERMINAL)
bTerminalID 1
wTerminalType 0x0101 USB Streaming
bAssocTerminal 0
bNrChannels 2
wChannelConfig 0x0003
Left Front (L)
Right Front (R)
iChannelNames 0
iTerminal 0
AudioControl Interface Descriptor:
bLength 10
bDescriptorType 36
bDescriptorSubtype 6 (FEATURE_UNIT)
bUnitID 2
bSourceID 12
bControlSize 1
bmaControls( 0) 0x03
Mute Control
Volume Control
bmaControls( 1) 0x00
bmaControls( 2) 0x00
iFeature 0
AudioControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 3 (OUTPUT_TERMINAL)
bTerminalID 3
wTerminalType 0x0402 Headset
bAssocTerminal 4
bSourceID 2
iTerminal 0
AudioControl Interface Descriptor:
bLength 12
bDescriptorType 36
bDescriptorSubtype 2 (INPUT_TERMINAL)
bTerminalID 4
wTerminalType 0x0402 Headset
bAssocTerminal 3
bNrChannels 1
wChannelConfig 0x0000
iChannelNames 0
iTerminal 0
AudioControl Interface Descriptor:
bLength 8
bDescriptorType 36
bDescriptorSubtype 6 (FEATURE_UNIT)
bUnitID 5
bSourceID 4
bControlSize 1
bmaControls( 0) 0x03
Mute Control
Volume Control
iFeature 0
AudioControl Interface Descriptor:
bLength 7
bDescriptorType 36
bDescriptorSubtype 5 (SELECTOR_UNIT)
bUnitID 9
bNrInPins 1
baSource( 0) 5
iSelector 0
AudioControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 3 (OUTPUT_TERMINAL)
bTerminalID 6
wTerminalType 0x0101 USB Streaming
bAssocTerminal 0
bSourceID 9
iTerminal 0
AudioControl Interface Descriptor:
bLength 12
bDescriptorType 36
bDescriptorSubtype 2 (INPUT_TERMINAL)
bTerminalID 10
wTerminalType 0x0201 Microphone
bAssocTerminal 0
bNrChannels 2
wChannelConfig 0x0003
Left Front (L)
Right Front (R)
iChannelNames 0
iTerminal 6 Sidetone
AudioControl Interface Descriptor:
bLength 10
bDescriptorType 36
bDescriptorSubtype 6 (FEATURE_UNIT)
bUnitID 11
bSourceID 10
bControlSize 1
bmaControls( 0) 0x03
Mute Control
Volume Control
bmaControls( 1) 0x00
bmaControls( 2) 0x00
iFeature 0
AudioControl Interface Descriptor:
bLength 13
bDescriptorType 36
bDescriptorSubtype 4 (MIXER_UNIT)
bUnitID 12
bNrInPins 2
baSourceID( 0) 1
baSourceID( 1) 11
bNrChannels 2
wChannelConfig 0x0003
Left Front (L)
Right Front (R)
iChannelNames 0
bmControls 0x00
iMixer 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 1
bNumEndpoints 1
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 0
AudioStreaming Interface Descriptor:
bLength 7
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 6
bDelay 0 frames
wFormatTag 1 PCM
AudioStreaming Interface Descriptor:
bLength 20
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bNrChannels 1
bSubframeSize 2
bBitResolution 16
bSamFreqType 4 Discrete
tSamFreq[ 0] 8000
tSamFreq[ 1] 16000
tSamFreq[ 2] 44100
tSamFreq[ 3] 48000
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 13
Transfer Type Isochronous
Synch Type Synchronous
Usage Type Data
wMaxPacketSize 0x00c0 1x 192 bytes
bInterval 1
bRefresh 0
bSynchAddress 0
AudioControl Endpoint Descriptor:
bLength 7
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x01
Sampling Frequency
bLockDelayUnits 0 Undefined
wLockDelay 0 Undefined
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 1
bNumEndpoints 1
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 0
AudioStreaming Interface Descriptor:
bLength 7
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 1
bDelay 0 frames
wFormatTag 1 PCM
AudioStreaming Interface Descriptor:
bLength 23
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bNrChannels 2
bSubframeSize 2
bBitResolution 16
bSamFreqType 5 Discrete
tSamFreq[ 0] 8000
tSamFreq[ 1] 16000
tSamFreq[ 2] 32000
tSamFreq[ 3] 44100
tSamFreq[ 4] 48000
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x04 EP 4 OUT
bmAttributes 13
Transfer Type Isochronous
Synch Type Synchronous
Usage Type Data
wMaxPacketSize 0x00c0 1x 192 bytes
bInterval 1
bRefresh 0
bSynchAddress 0
AudioControl Endpoint Descriptor:
bLength 7
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x01
Sampling Frequency
bLockDelayUnits 0 Undefined
wLockDelay 0 Undefined
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 3
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 3 Human Interface Device
bInterfaceSubClass 0 No Subclass
bInterfaceProtocol 0 None
iInterface 0
HID Device Descriptor:
bLength 9
bDescriptorType 33
bcdHID 1.00
bCountryCode 0 Not supported
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 332
Report Descriptors:
** UNAVAILABLE **
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0024 1x 36 bytes
bInterval 1
Device Status: 0x0000
(Bus Powered)
编辑
我注意到，pavucontrol我可以看到这些耳机有两种输出+输入模式，并且两种模式都会导致声音失真。
其他“仅输出”模式不会造成这种效果。
答案1
好的，我相信我找到了罪魁祸首。它似乎是在固件中定义的。
我成功跑了Jabra SDK demo https://developer.jabra.com/site/global/sdks/linux/index.gsp（Linux 上可用的某种设备配置应用程序，而不是像 Jabra 为 Windows 和 Mac 提供的用于管理设备配置的功能齐全的应用程序）
然后我设法读取了设备配置选项，Optimize audio for music不幸的是，对我来说，它们是：
- 禁用 - 始终降低音频质量
- 启用 - 质量好，但使用麦克风讲话时质量较差
是否有可能以某种方式覆盖它？
