一个月前，我安装了原生版 Ubuntu 20.04。一切似乎都运行良好，只是我的笔记本电脑内置麦克风或外置耳机录制的音频太低，而且噪音很大。在我之前的 Manjaro 安装中没有发生过这种情况。
我尝试删除 pulseaudio 驱动程序并重新安装，但没有效果。
我的笔记本电脑是 Acer Aspire 3。其他信息：
λ inxi -Fxz 0 (19.379s) < 13:25:38
System: Kernel: 5.4.0-42-generic x86_64 bits: 64 compiler: gcc v: 9.3.0 Desktop: Gnome 3.36.4
Distro: Ubuntu 20.04.1 LTS (Focal Fossa)
Machine: Type: Laptop System: Acer product: Aspire A315-42 v: V1.06 serial: <filter>
Mobo: PK model: Sleepy_PK v: V1.06 serial: <filter> UEFI: Insyde v: 1.06 date: 09/26/2019
Battery: ID-1: BAT1 charge: 25.4 Wh condition: 29.0/37.0 Wh (78%) model: PANASONIC 0x41,0x50,0x31,0x36,0x4D,0x35,0x0013
status: Discharging
CPU: Topology: Quad Core model: AMD Ryzen 5 3500U with Radeon Vega Mobile Gfx bits: 64 type: MT MCP arch: Zen+ rev: 1
L2 cache: 2048 KiB
flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm bogomips: 33537
Speed: 1297 MHz min/max: 1400/2100 MHz Core speeds (MHz): 1: 1284 2: 1260 3: 1221 4: 1222 5: 1304 6: 1223 7: 1222
8: 1222
Graphics: Device-1: Advanced Micro Devices [AMD/ATI] Picasso vendor: Acer Incorporated ALI driver: amdgpu v: kernel
bus ID: 05:00.0
Display: x11 server: X.Org 1.20.8 driver: amdgpu resolution: 1920x1080~60Hz
OpenGL: renderer: AMD RAVEN (DRM 3.35.0 5.4.0-42-generic LLVM 10.0.0) v: 4.6 Mesa 20.0.8 direct render: Yes
Audio: Device-1: Advanced Micro Devices [AMD/ATI] Raven/Raven2/Fenghuang HDMI/DP Audio vendor: Acer Incorporated ALI
driver: snd_hda_intel v: kernel bus ID: 05:00.1
Device-2: Advanced Micro Devices [AMD] Raven/Raven2/FireFlight/Renoir Audio Processor vendor: Acer Incorporated ALI
driver: snd_rn_pci_acp3x v: kernel bus ID: 05:00.5
Device-3: Advanced Micro Devices [AMD] Family 17h HD Audio vendor: Acer Incorporated ALI driver: snd_hda_intel
v: kernel bus ID: 05:00.6
Sound Server: ALSA v: k5.4.0-42-generic
Network: Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: Acer Incorporated ALI driver: r8169
v: kernel port: 2000 bus ID: 03:00.0
IF: enp3s0 state: down mac: <filter>
Device-2: Qualcomm Atheros QCA9377 802.11ac Wireless Network Adapter vendor: Lite-On driver: ath10k_pci v: kernel
port: 2000 bus ID: 04:00.0
IF: wlp4s0 state: up mac: <filter>
Drives: Local Storage: total: 1.03 TiB used: 52.38 GiB (5.0%)
ID-1: /dev/nvme0n1 vendor: Kingston model: RBUSNS8154P3128GJ1 size: 119.24 GiB
ID-2: /dev/sda vendor: Toshiba model: MQ04ABF100 size: 931.51 GiB temp: 26 C
Partition: ID-1: / size: 116.38 GiB used: 33.87 GiB (29.1%) fs: ext4 dev: /dev/nvme0n1p2
ID-2: /home size: 915.89 GiB used: 18.50 GiB (2.0%) fs: ext4 dev: /dev/sda1
Sensors: System Temperatures: cpu: 40.6 C mobo: N/A gpu: amdgpu temp: 40 C
Fan Speeds (RPM): N/A
Info: Processes: 279 Uptime: 19h 22m Memory: 5.81 GiB used: 3.03 GiB (52.2%) Init: systemd runlevel: 5 Compilers:
gcc: 9.3.0 Shell: fish v: 3.1.2 inxi: 3.0.38
此外，这是的输出journalctl -p err -b：
ago 17 18:02:56 aspire kernel: pci 0000:00:00.2: AMD-Vi: Unable to read/write to IOMMU perf counter.
ago 17 18:02:56 aspire kernel: integrity: Problem loading X.509 certificate -65
ago 17 18:02:56 aspire kernel: integrity: Problem loading X.509 certificate -65
ago 17 18:02:56 aspire kernel: snd_pci_acp3x 0000:05:00.5: Invalid ACP audio mode : 2
ago 17 18:02:57 aspire kernel: acp_pdm_mach acp_pdm_mach.0: ASoC: failed to init link acp3x-dmic-capture: -517
ago 17 18:02:57 aspire kernel: acp_pdm_mach acp_pdm_mach.0: snd_soc_register_card(acp) failed: -517
ago 17 18:02:57 aspire systemd-backlight[684]: Failed to get backlight or LED device 'backlight:acpi_video1': No such device
ago 17 18:02:57 aspire systemd[1]: Failed to start Load/Save Screen Backlight Brightness of backlight:acpi_video1.
ago 17 18:03:22 aspire gdm-password][1617]: gkr-pam: unable to locate daemon control file
ago 17 18:17:59 aspire pulseaudio[1644]: ALSA woke us up to write new data to the device, but there was actually nothing to write.
ago 17 18:17:59 aspire pulseaudio[1644]: Most likely this is a bug in the ALSA driver 'snd_hda_intel'. Please report this issue to the ALSA developers.
ago 17 18:17:59 aspire pulseaudio[1644]: We were woken up with POLLOUT set -- however a subsequent snd_pcm_avail() returned 0 or another value < min_avail.
ago 18 08:24:19 aspire systemd[1]: Failed to start Refresh fwupd metadata and update motd.
ago 18 08:56:27 aspire pulseaudio[1644]: ALSA woke us up to read new data from the device, but there was actually nothing to read.
ago 18 08:56:27 aspire pulseaudio[1644]: Most likely this is a bug in the ALSA driver 'snd_hda_intel'. Please report this issue to the ALSA developers.
ago 18 08:56:27 aspire pulseaudio[1644]: We were woken up with POLLIN set -- however a subsequent snd_pcm_avail() returned 0 or another value < min_avail.
我认为这可能是与 Ubuntu/Debian 相关的问题，因为我也安装了 Linux Mint 19 并且音频也遇到了问题。
提前致谢！
答案1
我有同样的声卡，最近声音出现了很多问题。我刚刚（5 分钟前）发现问题出在驱动程序上snd_rn_pci_acp3x。我将其列入黑名单，一切开始正常运转。系统现在正在使用snd_hda_intel driver。值得一试，只需添加：
blacklist snd_rn_pci_acp3x
在文件末尾/etc/modprobe.d/blacklist.conf。