linux-kernel - ThinkPad T-510: Audio output mute LED not working in 3.19.2

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Date:	Thu, 2 Apr 2015 16:00:56 -0600
From:	Glenn Golden <gdg@...ane.com>
To:	linux-kernel@...r.kernel.org
Subject: ThinkPad T-510: Audio output mute LED not working in 3.19.2

System:     Arch linux, synched to repos a few days ago
Kernel:     3.19.2-1
HW:         Lenovo ThinkPad T-510
Also see:   Attached output from 'lspci -vvv' and 'alsa-info.sh'

Throughout the 3.18 kernel series, both the MIC mute and audio output mute LEDs
worked as expected: The LEDs illuminated when the corresponding mute function
was active.

With 3.19.2, the MIC mute LED still works properly, but the audio output mute
LED no longer illuminates when the audio output mute function is active.
(The audio output mute functionality itself is fine; only the LED doesn't
reflect its state.)

I ran this issue by the pulseaudio folks 

    http://lists.freedesktop.org/archives/pulseaudio-discuss/2015-March/023551.html

and their view seems to be that this is most likely a kernel issue, since those
LEDs are supposed to automatically reflect the state of the associated capture
or playback controls.

Attached are outputs from "lspci -vvv" and "alsa-info.sh".  Please advise what
additional info you may need.  If you would prefer this issue be reported on the
kernel.org bugzilla, just let me know, I will be glad to refile it there.

Thank you.

View attachment "ga_alsa_info.txt" of type "text/plain" (37271 bytes)

View attachment "ga_pci_list.txt" of type "text/plain" (15045 bytes)