Kernel Bug Tracker – Bug 13633
[bisected] No sound on HDA Intel (ALC268)
Last modified: 2009-06-30 12:35:26 UTC
With a recent kernel, my laptop no longer produces sound from the speakers or the headphone jack. I have made sure all mixer controls are turned up and unmuted. I bisected the problem to the following commit:
Author: Takashi Iwai <firstname.lastname@example.org>
Date: Wed Apr 22 16:31:35 2009 +0200
ALSA: hda - Add amp initialization for realtek auto mode
In the realtek auto-probing mode, the initialization of amp with
some magic COEF or EAPD verbs is applied only when the codec SSID
has valid values to satisfy the realtek's definition.
However, many devices don't provide in that way, thus the device
doesn't work as is.
This patch allows the same initialization code even if the SSID
doesn't pass the bit test. Also, alc_subsystem_id() is changed
just to check and define the type, so that it's called in the
parser, instead of the initializer.
Signed-off-by: Takashi Iwai <email@example.com>
Here is my audio device:
00:1b.0 Audio device : Intel Corporation 82801H (ICH8 Family) HD Audio Controller [8086:284b] (rev 03)
Thanks for bisecting.
If the bug was caused by 4a79ba34cada6a5a4ee86ed53aa8a73ba1e6fc51 then it must
be a post-2.6.30 regression? I'll mark it as a regression.
Correct. 2.6.30 has working sound.
So, reverting that commit fixes the problem?
Could you run alsa-info.sh with --no-upload option on both working and non-working kernels, and attach the generated files here? The script is found at
That commit does not revert cleanly in the latest kernel, but I did double-check a build of the identified commit and its parent to make sure I didn't simply make a wrong turn while bisecting.
I'm rebuilding that kernel version now so I can get data from that script right before and after that commit.
I think I found the culprit. Try the patch below.
Created attachment 22138 [details]
alsa-info before the problem commit
Created attachment 22139 [details]
Add missing initializations for ALC268 and ALC269
Created attachment 22140 [details]
alsa-info with the problem commit
FYI, the patch is already in sound git tree, either master or for-next branch.
I just tried your patch on top of the latest kernel. Problem solved!
BTW, I don't see the patch in that git tree... Perhaps you didn't push yet?
Good to hear.
The patch is already there. Maybe just a matter of sync.
On Monday 29 June 2009, Brian Rogers wrote:
> Rafael J. Wysocki wrote:
> > This message has been generated automatically as a part of a report
> > of recent regressions.
> > The following bug entry is on the current list of known regressions
> > from 2.6.30. Please verify if it still should be listed and let me know
> > (either way).
> > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=13633
> > Subject : [bisected] No sound on HDA Intel (ALC268)
> > Submitter : Brian Rogers <firstname.lastname@example.org>
> > Date : 2009-06-27 04:42 (2 days old)
> Yes, this is still a current issue in mainline and a regression from 2.6.30.
The patch is merged to the upstream now.
Fixed by commit 1d955ebd4db7961dc4e772a23288b3d5c6f191be .