Public bug reported:
Affected Version/Release:
Linux Mint 21.3 "Virginia" (based on Ubuntu 22.04 LTS "Jammy
Jellyfish")
Kernel: 6.8.0-64-generic (Problematic)
Hardware Information:
Laptop Model: ASUS VivoBook ASUS Laptop X515DA-M515DA
Audio Codec: Realtek ALC256 (identified as hdaudioC1D0 on card 1)
Detailed Description of the Problem:
Since updating to (or booting with) kernel 6.8.0-64-generic on my Linux
Mint 21.3 system, the internal microphone has ceased to function. This
issue persists after a clean reboot and does not appear to be related to
external applications holding the device.
Symptoms:
The internal microphone does not pick up any sound; the input level
meter in "Sound Settings" (Input tab) remains flat when speaking.
No audio can be recorded using sound recording applications (e.g.,
GNOME Sound Recorder).
Attempts to force-reload ALSA sound driver modules (sudo alsa force-
reload) fail, indicating that modules remain loaded. Previous dmesg
output (when attempting alsa force-reload) showed "The codec is being
used, can't reconfigure."
Working Configuration:
The internal microphone functions perfectly when booting and
operating with the older kernel 6.8.0-60-generic. This strongly suggests
a regression introduced in kernel 6.8.0-64-generic that affects the
Realtek ALC256 audio codec on this specific hardware.
Diagnostic Steps Performed (with problematic kernel 6.8.0-64-generic
active):
Observation: This shows pulseaudio holding locks on the
control interfaces and specifically the capture device (pcmC1D0c) for
the internal microphone.
Observation: These logs show the Realtek ALC256 codec is
correctly detected and autoconfigured by the kernel at boot. There are
no "codec in use" or explicit error messages related to the initial
driver loading/binding during the boot process.
systemctl --user status pulseaudio.service output:
Observation: PulseAudio reports as active (running),
indicating it has started successfully. A minor Could not find
org.bluez.BatteryPr warning is present but is not believed to be related
to the core audio functionality.
alsamixer check:
alsamixer interface shows the internal microphone as unmuted,
and input levels are set appropriately (not at zero). This confirms
basic ALSA driver configuration is present.
Graphical Sound Settings:
Under the "Input" tab, the internal microphone is listed and
selected, but its input level meter does not react to sound.
Root Cause (Inferred):
The issue appears to be a compatibility problem between kernel 6.8.0-64-generic
and the Realtek ALC256 audio codec, specifically in how PulseAudio interacts
with the driver for microphone input. While PulseAudio successfully acquires
the device, it seems unable to process or pass through the audio input,
effectively making the microphone unusable.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2117316
Title:
Microphone (Realtek ALC256) not working with kernel 6.8.0-64-generic
on ASUS X515DA
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