https://bugzilla.kernel.org/show_bug.cgi?id=198597
Bug ID: 198597
Summary: Microphone Mute, and Mute LEDs Does Not Function
Correctly on ThinkPad L420
Product: ACPI
Version: 2.5
Kernel Version: 4.14.12
Hardware: x86-64
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: BIOS
Assignee: acpi_b...@kernel-bugs.osdl.org
Reporter: jeff...@aosc.io
Regression: No
On a Lenovo ThinkPad L420 (Type 7854)...
- Neither the LED nor the button for Microphone Mute works, the `acpi_listen`
command does not return with any readings. Pressing the button won't mute the
microphone, nor would it light up the LED. However, using a volume mixer
application (say, the one I used was from MATE Desktop) and drag the microphone
volume all the way down, or checking "mute" will light up the button.
- The mute button works, but the LED does not light up. The mute LED could be
lit or unlit before booting Linux. Pressing the button registers the following
with the `acpi_listen` command:
mingcongbai@ThinkPad [ ~ ] $ acpi_listen
button/mute MUTE 00000080 00000000 K
I have also tried Linux 4.9.75, which returned the same result.
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