Re: [alsa-devel] [PATCH] thinkpad-acpi: Enable microphone mute LED
On Fri, May 27, 2011 at 12:48 PM, Matthew Garrett mjg59@srcf.ucam.org 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?
--Andy
On Fri, May 27, 2011 at 02:22:26PM -0400, Andrew Lutomirski wrote:
On Fri, May 27, 2011 at 12:48 PM, Matthew Garrett mjg59@srcf.ucam.org wrote:
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.
Yes, I think standardised naming is going to be necessary to make this kind of thing work. That just leaves us with the additional problem of figuring out who has responsibility for toggling it and maanging permissions appropriately, but we'll get to that.
Do any of the ALSA or PulseAudio people have any preferences?
Cc:ed Lennart to get his perspective.
At Fri, 27 May 2011 14:22:26 -0400, Andrew Lutomirski wrote:
On Fri, May 27, 2011 at 12:48 PM, Matthew Garrett mjg59@srcf.ucam.org 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?
thanks,
Takashi
participants (3)
-
Andrew Lutomirski -
Matthew Garrett -
Takashi Iwai