[alsa-devel] ALC268 - Driving mute led with GPIO

Takashi Iwai tiwai at suse.de
Thu Feb 4 17:48:37 CET 2010

At Thu, 04 Feb 2010 18:44:48 +0200,
Ozan Çağlayan wrote:
> Hi,
> We have a laptop here (a local brand) which has a mute button with a LED. Currently the mute button works correctly but the
> led is non-functional.
> I've played through hda-analyzer and found out that it's enabled when you enable gpio3 and click out_dir. Clicking out_dir
> again and again switches it on and off.
> There's a mute led stuff in patch_sigmatel, sigmatel_spec has gpio_led and gpio_polarity information but alc_spec doesn't have.
> How should we hook/patch that information into the codec?

This can be rather controlled in a different way, such as GPIO.

For example, if it's a HP machine, usually one of GPIO line
corresponds to the mute LED (sometimes it mutes the speaker via


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