Re: [alsa-devel] No speaker output with kernel 3.15 and later

7 Jul 2014

      On Mon, 2014-07-07 at 17:41 +0200, Takashi Iwai wrote:
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At Mon, 07 Jul 2014 16:34:10 +0100,
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Steven Newbury wrote:
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On Tue, 2014-07-01 at 13:54 +0200, Takashi Iwai wrote:
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At Tue, 01 Jul 2014 12:49:32 +0100,
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Steven Newbury wrote:
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On Mon, 2014-06-30 at 11:24 +0200, Takashi Iwai wrote:
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At Sun, 29 Jun 2014 15:09:56 +0100,
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Steven Newbury wrote:
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I sent
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Takashi an email mentioning this regression a month ago,
and
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it's
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taken me this long to send this email... :-$
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Since updating to
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kernel versions >=3.15 I've had no audio from my
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laptop speakers.
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Earlier versions worked fine.
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It's a CLEVO W270EUQ laptop.  The
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output mixer device is showing up,
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but no sound comes out at any
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volume level.
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As requested I've attached compressed alsa-info.sh
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output for both the
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working and non-working cases.
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I'm perfectly
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willing to test patches etc.
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Hm, I see no significant difference between 3.14 and 3.15
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alsa-info.sh
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outputs, and there's been very little change for VIA codecs
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between
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these versions.  So, in short, I have no idea what went
wrong.
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Could you double-check whether it's really a kernel issue?
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That is, switch between 3.14 and 3.15 and confirm the
problem
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happens
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only with 3.15.  Also, for testing the sound, try like
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      % aplay -Dplughw -vv foo.wav

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Checked again.
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3.16-rc2: silence
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3.14.3: works fine
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Then I'd suggest to bisect between 3.14 and 3.15.
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Somewhat surprisingly I ended up here:
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dcb32ecd9a533f47ab652c5c5680bc50a7a822cd is the first bad commit
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commit dcb32ecd9a533f47ab652c5c5680bc50a7a822cd
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Author: Anssi Hannula anssi.hannula@iki.fi
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Date:   Tue Apr 8 12:36:42 2014 +0300
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 ALSA: hda - Do not assign streams in reverse order

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 Currently stream numbers are assigned in reverse order.

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 Unfortunately commit 7546abfb8e1f9933b5 ("ALSA: hda -

Increment
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 default stream numbers for AMD HDMI controllers") assumed

this was not
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 the case (specifically, it had the "old cards had single

device only"
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 => "extra unused stream numbers do not matter" assumption),

causing
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 non-working audio regressions for AMD Radeon HDMI users.

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 Change the stream numbers to be assigned in forward order.

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 The benefit is that regular audio playback will still work

even if the
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 assumed stream count is too high, downside is that a too high

stream
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 count may remain hidden.

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 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=77002

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 Reported-by: Christian GÃ¼del <cg@dmesg.ch>

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 Signed-off-by: Anssi Hannula <anssi.hannula@iki.fi>

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 Tested-by: Christian GÃ¼del <cg@dmesg.ch> # 3.14

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 Cc: Alex Deucher <alexander.deucher@amd.com>

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 Signed-off-by: Takashi Iwai <tiwai@suse.de>

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:040000 040000 6ed3a982a9600333b07a42169db5173fa75b8618
b7ff28d00007f988221ba58c9d3f501fdb3a7583 M        sound
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Interesting.  Does reverting this commit fix the issue?
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Just run "git revert dcb32ecd9a533f47ab652c5c5680bc50a7a822cd", and
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test it.
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I just did this on top of my rebased local git tree off linus/master
   and indeed reverting does make the speakers work again.*
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thanks,
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Takashi
â€‹