Re: [alsa-devel] [PATCH] thinkpad-acpi: Enable microphone mute LED

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On Fri, Jun 03, 2011 at 05:50:42PM +0200, Takashi Iwai wrote:
> At Fri, 27 May 2011 14:22:26 -0400,
> Andrew Lutomirski wrote:
> > 
> > On Fri, May 27, 2011 at 12:48 PM, Matthew Garrett <mjg59@xxxxxxxxxxxxx> wrote:
> > > On Fri, May 27, 2011 at 12:39:10PM -0400, Andrew Lutomirski wrote:
> > >
> > >> I don't have docs so I don't really know.  But the mute LED does not
> > >> appear to be controllable from the LED interface and when mute is lit
> > >> there's no sound regardless of what ALSA thinks.  When I light the
> > >> micmute light, I can still record sound just fine.
> > >>
> > >> The mic mute button does nothing on Windows unless the special driver
> > >> is installed, and that driver seems to mute the Windows mixer, so I
> > >> think there's nothing special other than a little userspace helper
> > >> going on.
> > >
> > > Hm. That makes things kind of tricky. While it's easy to just expose the
> > > LED, really we want to do it in such a way that userspace knows which
> > > LEDs it should be toggling while setting the microphone mute.
> > 
> > One thought: call the thing laptop::micmute and teach userspace to
> > look for an led with that name.
> > 
> > Do any of the ALSA or PulseAudio people have any preferences?
> 
> I don't know of any machines but Thinkpad providing such a LED
> control, so I'm fine with any naming basically :)  Though, if there
> are many of such mute LEDs, any parseable form like laptop::xxx-mute
> would be better for future?

The Thinkpad USB keyboard also has such an LED:

http://www.thinkpads.com/wp-content/uploads/2009/08/lenovo_thinkpad_usb_trackpoint_keyboard-2.jpg

-- Sebastian

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