Linux Mint on Acer C771-C4TM Chromebook no sound

[moonbounce]

Hello,

I have an Acer C771-C4TM Chromebook I installed Linux Mint on just today. The system firmware was flashed using Mrchromebox firmware (https://mrchromebox.tech/#fwscript). I have been trying a few different distributions with similar results namely Xubuntu, Ubuntu, Fedora, Debian, and a couple customized versions of Debian and Ubuntu with preconfigured software for HAM radio. In all instances everything works fine except audio. I get no sound and only have dummy output as an option and at this point I do have what looks like my sound card appearing in the sound settings (Digital Stereo HDMI Output) after . I've tried nearly everything I could find from googling and it seems much of the time the fix is hardware specific. I tested the HDMI port and the headphone jack without success. I'm a relative newbie to Linux and pretty lost when it comes to getting drivers to work. Any help is greatly appreciated.

Thank you,

Version info:
Operating System: Linux Mint 21
Kernel: Linux 5.15.0-56-generic
Architecture: x86-64
Hardware Vendor: Google
Hardware Model: Lars

[deepakdeshp]

Please post output of command

inxi -Fxxxrz
in code tags.

[deepakdeshp]

Also see
viewtopic.php?f=48&t=363010

[moonbounce]

Here is the output from inxi -Fxxxrz

Code: Select all

System:
  Kernel: 5.15.0-56-generic x86_64 bits: 64 compiler: gcc v: 11.3.0
    Desktop: MATE 1.26.0 info: mate-panel wm: marco 1.26.0 vt: 7
    dm: LightDM 1.30.0 Distro: Linux Mint 21 Vanessa base: Ubuntu 22.04 jammy
Machine:
  Type: Laptop System: Google product: Lars v: 1.0
    serial: <superuser required> Chassis: type: 9 serial: <superuser required>
  Mobo: Google model: Lars v: 1.0 serial: <superuser required>
    UEFI: coreboot v: MrChromebox-4.18.2 date: 11/29/2022
Battery:
  ID-1: BAT0 charge: 20.8 Wh (54.5%) condition: 38.2/44.7 Wh (85.4%)
    volts: 11.2 min: 11.4 model: SONYCor AP13J4K type: Li-ion serial: <filter>
    status: Discharging cycles: 64
CPU:
  Info: dual core model: Intel Celeron 3855U bits: 64 type: MCP
    smt: <unsupported> arch: Skylake rev: 3 cache: L1: 128 KiB L2: 512 KiB
    L3: 2 MiB
  Speed (MHz): avg: 500 min/max: 400/1600 cores: 1: 500 2: 500
    bogomips: 6399
  Flags: ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx
Graphics:
  Device-1: Intel HD Graphics 510 driver: i915 v: kernel ports: active: eDP-1
    empty: DP-1, DP-2, DP-3, HDMI-A-1, HDMI-A-2, HDMI-A-3 bus-ID: 00:02.0
    chip-ID: 8086:1906 class-ID: 0300
  Device-2: Chicony HD WebCam type: USB driver: uvcvideo bus-ID: 1-2:2
    chip-ID: 04f2:b567 class-ID: 0e02
  Display: x11 server: X.Org v: 1.21.1.3 compositor: marco v: 1.26.0
    driver: X: loaded: modesetting unloaded: fbdev,vesa gpu: i915
    display-ID: :0 screens: 1
  Screen-1: 0 s-res: 1366x768 s-dpi: 96 s-size: 361x203mm (14.2x8.0")
    s-diag: 414mm (16.3")
  Monitor-1: eDP-1 model: Chi Mei Innolux res: 1366x768 hz: 60 dpi: 136
    size: 256x144mm (10.1x5.7") diag: 294mm (11.6") modes: 1366x768
  OpenGL: renderer: Mesa Intel HD Graphics 510 (SKL GT1) v: 4.6 Mesa 22.0.5
    direct render: Yes
Audio:
  Device-1: Intel Sunrise Point-LP HD Audio driver: snd_hda_intel v: kernel
    bus-ID: 00:1f.3 chip-ID: 8086:9d70 class-ID: 0401
  Sound Server-1: ALSA v: k5.15.0-56-generic running: yes
  Sound Server-2: PulseAudio v: 15.99.1 running: yes
  Sound Server-3: PipeWire v: 0.3.48 running: yes
Network:
  Device-1: Intel Wireless 7265 driver: iwlwifi v: kernel pcie:
    speed: 2.5 GT/s lanes: 1 bus-ID: 01:00.0 chip-ID: 8086:095a class-ID: 0280
  IF: wlp1s0 state: up mac: <filter>
Bluetooth:
  Device-1: Intel Bluetooth wireless interface type: USB driver: btusb v: 0.8
    bus-ID: 1-3:3 chip-ID: 8087:0a2a class-ID: e001
  Report: hciconfig ID: hci0 rfk-id: 0 state: up address: <filter>
    bt-v: 2.1 lmp-v: 4.2 sub-v: 1100 hci-v: 4.2 rev: 1100
Drives:
  Local Storage: total: 87.36 GiB used: 14.19 GiB (16.2%)
  ID-1: /dev/mmcblk0 vendor: HP model: DF4032 size: 29.12 GiB type: SSD
    serial: <filter> rev: 0x8 scheme: GPT
  ID-2: /dev/sda type: USB vendor: Generic model: STORAGE DEVICE
    size: 58.24 GiB type: N/A serial: <filter> rev: 0819 scheme: MBR
Partition:
  ID-1: / size: 28 GiB used: 11.82 GiB (42.2%) fs: ext4 dev: /dev/mmcblk0p2
  ID-2: /boot/efi size: 511 MiB used: 18.2 MiB (3.6%) fs: vfat
    dev: /dev/mmcblk0p1
Swap:
  ID-1: swap-1 type: file size: 1.33 GiB used: 0 KiB (0.0%) priority: -2
    file: /swapfile
Sensors:
  System Temperatures: cpu: 28.0 C pch: 26.0 C mobo: N/A
  Fan Speeds (RPM): N/A
Repos:
  Packages: apt: 2150
  No active apt repos in: /etc/apt/sources.list
  Active apt repos in: /etc/apt/sources.list.d/official-package-repositories.list
    1: deb http://packages.linuxmint.com vanessa main upstream import backport
    2: deb http://archive.ubuntu.com/ubuntu jammy main restricted universe multiverse
    3: deb http://archive.ubuntu.com/ubuntu jammy-updates main restricted universe multiverse
    4: deb http://archive.ubuntu.com/ubuntu jammy-backports main restricted universe multiverse
    5: deb http://security.ubuntu.com/ubuntu/ jammy-security main restricted universe multiverse
Info:
  Processes: 204 Uptime: 2m wakeups: 4595 Memory: 3.73 GiB
  used: 1.5 GiB (40.2%) Init: systemd v: 249 runlevel: 5 Compilers:
  gcc: 11.3.0 alt: 11 Shell: Bash v: 5.1.16 running-in: mate-terminal
  inxi: 3.3.13

[moonbounce]

Also thank you for the reply I appreciate the help

[moonbounce]

Just wanted to post an update: I have sound but only with the use of an HDMI Audio Splitter from the onboard HDMI. The splitter has a headphone jack to plug in speakers/headphones so I think I'm good. Using the link to the troubleshooting instructions posted in the 3rd response in this thread I did eventually get the HDMI audio drivers to install instead of "Dummy Output". With that I used the splitter and headphones to get sound as I would need separate drivers to use the built in headphone jack. Though I would like to be able to use the onboard jack I'm content using the splitter as I would prefer using headphones and better quality external speakers anyway for HAM radio purposes. I don't know if applying solved to the title would be appropriate but I think for those that may be using an Acer C771 this is a viable solution since it seems this device may in general be troublesome when it comes to the other drivers and may just be less compatible. If you still want to try some things though I'm all for it and willing to experiment. Thank you.