系统配置：
- Thinkpad X1 Carbon 第五代
- Ubuntu 18.10
- 声卡：Intel Corporation Sunrise Point-LP HD Audio，CX8200
- 内核：4.18.0-15-generic
问题：
播放音频（任何来源，Youtube、Spotify 等...）时，音频一开始听起来不错（可能持续几分钟，有时甚至一个小时），然后突然声音变得刺耳、遥远、混乱和失真。这种情况发生在我的耳机直接连接到笔记本电脑或通过 Thinkpad USB-C 底座播放时，直接通过扬声器播放是不可能的，因为我在开放式办公室。
我尝试了以下操作但没有成功：
- 使用以下命令修改 default.pa/system.pa：load-module module-udev-detect tsched=0
- 尝试过不使用 pulseaudio 直接在 Alsa 上播放
- 尝试调高或调低音量等等...（有时会有帮助，但过一会儿又会搞砸）
- 尝试将 daemon.conf 中的采样率修改为其他值。
重启有帮助，但几分钟后声音又会失真。这让我在这个硬件上听音频完全没用。总的来说，与 Windows 相比，整个音频体验要差很多 :(
关于我的系统的一些查询：
root:~# uname -r
4.18.0-15-generic
root:~# dmesg | grep audio
[ 3.250359] snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915])
[ 3.351782] snd_hda_codec_conexant hdaudioC0D0: CX8200: BIOS auto-probing.
[ 3.352919] snd_hda_codec_conexant hdaudioC0D0: autoconfig for CX8200: line_outs=1 (0x17/0x0/0x0/0x0/0x0) type:speaker
[ 3.352921] snd_hda_codec_conexant hdaudioC0D0: speaker_outs=0 (0x0/0x0/0x0/0x0/0x0)
[ 3.352923] snd_hda_codec_conexant hdaudioC0D0: hp_outs=1 (0x16/0x0/0x0/0x0/0x0)
[ 3.352924] snd_hda_codec_conexant hdaudioC0D0: mono: mono_out=0x0
[ 3.352925] snd_hda_codec_conexant hdaudioC0D0: inputs:
[ 3.352927] snd_hda_codec_conexant hdaudioC0D0: Internal Mic=0x1a
[ 3.352929] snd_hda_codec_conexant hdaudioC0D0: Mic=0x19
[ 3.356819] snd_hda_codec_conexant hdaudioC0D0: Enable sync_write for stable communication
[ 5.292555] usbcore: registered new interface driver snd-usb-audio
root:~# lspci -v | grep -i audio
00:1f.3 Audio device: Intel Corporation Sunrise Point-LP HD Audio (rev 21)
Subsystem: Lenovo Sunrise Point-LP HD Audio
root:~# pacmd list-sinks
2 sink(s) available.
* index: 0
name: <alsa_output.usb-Lenovo_ThinkPad_USB-C_Dock_Audio_000000000000-00.analog-stereo>
driver: <module-alsa-card.c>
flags: HARDWARE HW_MUTE_CTRL HW_VOLUME_CTRL LATENCY
state: IDLE
suspend cause: (none)
priority: 9049
volume: front-left: 11106 / 17%, front-right: 11106 / 17%
balance 0.00
base volume: 65536 / 100%
volume steps: 51
muted: no
current latency: 102.52 ms
max request: 18 KiB
max rewind: 18 KiB
monitor source: 0
sample spec: s16le 2ch 48000Hz
channel map: front-left,front-right
Stereo
used by: 0
linked by: 1
fixed latency: 100.00 ms
card: 0 <alsa_card.usb-Lenovo_ThinkPad_USB-C_Dock_Audio_000000000000-00>
module: 7
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 = "1"
alsa.card_name = "ThinkPad USB-C Dock Audio"
alsa.long_card_name = "Lenovo ThinkPad USB-C Dock Audio at usb-0000:3c:00.0-1.4.2.3, full speed"
alsa.driver_name = "snd_usb_audio"
device.bus_path = "pci-0000:3c:00.0-usb-0:1.4.2.3:1.0"
sysfs.path = "/devices/pci0000:00/0000:00:1d.0/0000:06:00.0/0000:07:02.0/0000:3c:00.0/usb3/3-1/3-1.4/3-1.4.2/3-1.4.2.3/3-1.4.2.3:1.0/sound/card1"
udev.id = "usb-Lenovo_ThinkPad_USB-C_Dock_Audio_000000000000-00"
device.bus = "usb"
device.vendor.id = "17ef"
device.vendor.name = "Lenovo"
device.product.id = "3063"
device.product.name = "ThinkPad USB-C Dock Audio"
device.serial = "Lenovo_ThinkPad_USB-C_Dock_Audio_000000000000"
device.string = "front:1"
device.buffering.buffer_size = "19200"
device.buffering.fragment_size = "4800"
device.access_mode = "mmap"
device.profile.name = "analog-stereo"
device.profile.description = "Analog Stereo"
device.description = "ThinkPad USB-C Dock Audio Analog Stereo"
alsa.mixer_name = "USB Mixer"
alsa.components = "USB17ef:3063"
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: 1
name: <alsa_output.pci-0000_00_1f.3.analog-stereo>
driver: <module-alsa-card.c>
flags: HARDWARE HW_MUTE_CTRL HW_VOLUME_CTRL LATENCY
state: RUNNING
suspend cause: (none)
priority: 9039
volume: front-left: 63624 / 97%, front-right: 63624 / 97%
balance 0.00
base volume: 65536 / 100%
volume steps: 75
muted: no
current latency: 100.90 ms
max request: 18 KiB
max rewind: 18 KiB
monitor source: 2
sample spec: s16le 2ch 48000Hz
channel map: front-left,front-right
Stereo
used by: 1
linked by: 3
fixed latency: 100.00 ms
card: 1 <alsa_card.pci-0000_00_1f.3>
module: 8
properties:
alsa.resolution_bits = "16"
device.api = "alsa"
device.class = "sound"
alsa.class = "generic"
alsa.subclass = "generic-mix"
alsa.name = "CX8200 Analog"
alsa.id = "CX8200 Analog"
alsa.subdevice = "0"
alsa.subdevice_name = "subdevice #0"
alsa.device = "0"
alsa.card = "0"
alsa.card_name = "HDA Intel PCH"
alsa.long_card_name = "HDA Intel PCH at 0xec340000 irq 134"
alsa.driver_name = "snd_hda_intel"
device.bus_path = "pci-0000:00:1f.3"
sysfs.path = "/devices/pci0000:00/0000:00:1f.3/sound/card0"
device.bus = "pci"
device.vendor.id = "8086"
device.vendor.name = "Intel Corporation"
device.product.id = "9d71"
device.product.name = "Sunrise Point-LP HD Audio"
device.form_factor = "internal"
device.string = "front:0"
device.buffering.buffer_size = "19200"
device.buffering.fragment_size = "4800"
device.access_mode = "mmap"
device.profile.name = "analog-stereo"
device.profile.description = "Analog Stereo"
device.description = "Built-in Audio Analog Stereo"
alsa.mixer_name = "Conexant CX8200"
alsa.components = "HDA:14f12008,17aa224f,00100103 HDA:8086280b,80860101,00100000"
module-udev-detect.discovered = "1"
device.icon_name = "audio-card-pci"
ports:
analog-output-speaker: Speakers (priority 10000, latency offset 0 usec, available: no)
properties:
device.icon_name = "audio-speakers"
analog-output-headphones: Headphones (priority 9000, latency offset 0 usec, available: yes)
properties:
device.icon_name = "audio-headphones"
active port: <analog-output-headphones>
我尝试在互联网上查找所有信息但一无所获。
救命！有人有线索吗？
答案1
好吧，就愚蠢而言 - 问题在于我的耳机的物理电缆连接器故障！:)，因此请务必先检查明显的问题!!! 更换电缆后，一切恢复正常。