linux-kernel - Re: [REGRESSION] 4.1-rc4: Sound muted after boot

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Date:	Thu, 21 May 2015 11:19:02 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Martin Steigerwald <martin@...htvoll.de>
Cc:	linux-kernel@...r.kernel.org, alsa-devel@...a-project.org
Subject: Re: [REGRESSION] 4.1-rc4: Sound muted after boot

At Thu, 21 May 2015 11:08:36 +0200,
Martin Steigerwald wrote:
> 
> Am Donnerstag, 21. Mai 2015, 06:28:24 schrieb Takashi Iwai:
> > At Wed, 20 May 2015 16:31:55 +0200,
> > 
> > Martin Steigerwald wrote:
> > > Hello!
> > > 
> > > On ThinkPad T520 (Intel Sandybridge) with 4.14-rc4 + two BTRFS patches
> > > and one Intel P-State debug patch I have no sound output on internal
> > > Intel HD audio codec.
> > > 
> > > According to ThinkPad T520 LED with striked-through speaker the loud
> > > speaker is in disabled state. Also KDE´s Phonon says a soundcard is
> > > missing. In alsa-mixer I see nothing as MM for muted. If I press the
> > > key next to the LED I get a notification on the desktop that loud
> > > speaker has been enabled / disabled, but the LED still is on for it
> > > being disabled.
> 
> One clarification: Phonon still seems to see a sound card… but it reports a 
> change to the list of soundcards.
> 
> And another observation: The speaker disable LED is switched on KDE/Plasma 
> 4.14.2 session startup, I just rebooted to 4.1-rc4 after I gathered debug 
> output of 4.0.1, and there on boot the speaker disable LED was off during 
> boot.
> 
> So there seems Phonon is confused about some difference in ALSA between these 
> two kernel versions and probably doesn´t fully find the sound card or mutes 
> it, but on the other hand I can´t see it in alsa-mixer as muted.
> 
> And alsa-mixer still finds the internal sound.
> 
> Also this does not happen for external USB JBL Pebbles speakers (excellent 
> ones!) at home, sound just works with 4.1-rc4 with these.
> 
> I am now on 4.1-rc4 again so could try to dig out more what KDE Phonon sees 
> as a difference. In trainings breaks. Now need to continue with the course I 
> hold.
> 
> Phonon runs without PulseAudio here, cause PulseAudio creates additional 
> issues with sound. Okay, this is the message I get:
> 
> KDE hat festgestellt, dass eines oder mehrere interne Geräte entfernt 
> wurden.
> Soll KDE die Informationen zu diesen Geräten dauerhaft löschen?
> Dies ist die Liste der Geräte, die entfernt werden können:
> Aufnahme: HDA Intel PCH (CX20590 Analog)
> Wiedergabe: HDA Intel PCH (CX20590 Analog)
> 
> Which means: KDE has found that one or more internal devices were removed.
> 
> So it seems KDE really does not find the sound card anymore, while alsa-mixer 
> finds it, yet, also aplay does not produce any sound.
> 
> But then I still have a "HDA Intel PCH (CX20590 Analog)" in systemsettings 
> for Phonon. There is one greyed out and another one which is not greyed out, 
> but does not produce any sound on clicking the test button either.

All of these sound like a problem with Phonon.  There is no change in
the interface and device names of your board between 4.0 and 4.1 in
the kernel level.  You can compare alsa-info.sh outputs.


Takashi
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