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CONFIG_THINKPAD_ACPI_ALSA_SUPPORT: Console audio control ALSA interface

General informations

The Linux kernel configuration item CONFIG_THINKPAD_ACPI_ALSA_SUPPORT:

Help text

Enables monitoring of the built-in console audio output control (headphone and speakers), which is operated by the mute and (in some ThinkPad models) volume hotkeys.

If this option is enabled, ThinkPad-ACPI will export an ALSA card with a single read-only mixer control, which should be used for on-screen-display feedback purposes by the Desktop Environment.

Optionally, the driver will also allow software control (the ALSA mixer will be made read-write). Please refer to the driver documentation for details.

All IBM models have both volume and mute control. Newer Lenovo models only have mute control (the volume hotkeys are just normal keys and volume control is done through the main HDA mixer).



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