From mboxrd@z Thu Jan  1 00:00:00 1970
From: Glenn Golden <gdg@zplane.com>
Subject: Re: [pulseaudio-discuss] ThinkPad T-510 audio output
 mute LED non-workingness
Date: Tue, 28 Apr 2015 11:53:17 -0600
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To: Takashi Iwai <tiwai@suse.de>
Cc: alsa-devel@alsa-project.org, Alex Hung <alex.hung@canonical.com>, Henrique de Moraes Holschuh <hmh@hmh.eng.br>, Raymond Yau <superquad.vortex2@gmail.com>, bruno.mueller@gmail.com, David Henningsson <david.henningsson@canonical.com>
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Takashi Iwai <tiwai@suse.de> [2015-04-28 13:50:21 +0200]:
> At Tue, 28 Apr 2015 05:39:48 -0600,
> Glenn Golden wrote:
> > 
> > Takashi Iwai <tiwai@suse.de> [2015-04-28 12:30:19 +0200]:
> > > 
> > > Then it's likely an issue in thinkpad_acpi.c.  It implies that the
> > > driver couldn't get SSMS acpi handle.
> > > 
> > 
> > Raymond had pointed this out earlier as a (the?) patch that brought the static
> > tp_led_table led_tables[] into existence:
> > 
> >     http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/platform/x86/thinkpad_acpi.c?id=420f9739a62cdb027f5580d25c813501ff93aa6f
> 
> This change was in 3.13 kernel, nothing new.
> 


OK.

What's next on the menu for my end? Any further experiments that can be 
useful to try?