[alsa-devel] REGRESSION: Webcam mic for 145f:015b not longer working with 1.0.24 and above (OK with 1.0.23)

Daniel Mack zonque at gmail.com
Wed Aug 29 00:51:29 CEST 2012 

On 29.08.2012 00:16, Kostas wrote:
> On 28/08/2012 12:55 μμ, Daniel Mack wrote:
>> On 28.08.2012 11:47, Kostas wrote:
>>> On 28/08/2012 12:30 μμ, Daniel Mack wrote:
>>>> On 28.08.2012 11:18, Kostas wrote:
>>>>> On 28/08/2012 12:06 μμ, Daniel Mack wrote:
>>>>>> On 28.08.2012 10:56, Kostas wrote:
>>>>>>> On 28/08/2012 11:50 πμ, Daniel Mack wrote:
>>>>>>>> On 28.08.2012 10:47, Kostas wrote:
>>>>>>>>> On 28/08/2012 08:44 πμ, Daniel Mack wrote:
>>>>>>>>>> On 28.08.2012 00:19, Kostas wrote:
>>>>>>>>>>> On 27/08/2012 06:54 μμ, Kostas wrote:
>>>>>>>>>>>> On 27/08/2012 02:44 μμ, Daniel Mack wrote:
>>>>>>>>>>>>> On 27.08.2012 12:33, Kostas wrote:
>>>>>>>>>>>>>> On 27/08/2012 12:26 μμ, Daniel Mack wrote:
>>>>>>>>>>>>>>> On 27.08.2012 11:00, Kostas wrote:
>>>>>>>>>>>>>>>> Hi All,
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> I have a 'Trust Webcam' (USB ID: 145f:015b) that comes with a
>>>>>>>>>>>>>>>> microphone.
>>>>>>>>>>>>>>>> The microphone works with Alsa 1.0.23 but it does not work with the
>>>>>>>>>>>>>>>> latest Alsa 1.0.25 neither with Alsa 1.0.24.
>>>>>>>>>>>>>>>> Apparently this is a regression.
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> What shall I do to figure out the source of the problem?
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> Here are attached my alsa-infos, with Alsa 1.0.23 (working),
>>>>>>>>>>>>>>>> 1.0.24 (NOT
>>>>>>>>>>>>>>>> working) and 1.0.25 (NOT working).
>>>>>>>>>>>>>>> Can you provide dmesg protocols for both a working and a non-working
>>>>>>>>>>>>>>> case please?
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Below are attached the dmesg files.
>>>>>>>>>>>>>>
>>>>>>>>>>>>> Thanks - the logs look both good, I guess the interesting messages are
>>>>>>>>>>>>> only generated once you try to start the stream. Can you try this?
>>>>>>>>>>>> How i do that?
>>>>>>>>>>>> I tried to make a test call in skype and also recording a video in
>>>>>>>>>>>> cheese but no changes in dmesg.
>>>>>>>>>>>> Is there another way to start the stream?
>>>>>>>>>>> Also tried to record voice with sound recorder...with alsa 1.0.23
>>>>>>>>>>> recording is fine..i hear my voice when playback the file but with alsa
>>>>>>>>>>> 1.0.24 and above nothing is recorded.
>>>>>>>>>>> In both cases nothing is changed in dmesg output.
>>>>>>>>>>> What else could i do to help you out?
>>>>>>>>>>>
>>>>>>>>>> Comparing the two dmesg logs, I'm under the impression that in the
>>>>>>>>>> second case (the newer kernel), the hda driver kicks in and creates a
>>>>>>>>>> sound device before the usb audio driver does. Hence, the default card
>>>>>>>>>> changes and you're recording from your internal sound card rather than
>>>>>>>>>> the Webcam.
>>>>>>>>>>
>>>>>>>>>> Could you please send the output of 'aplay -l' in both cases?
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> Daniel
>>>>>>>>>>
>>>>>>>>> Output of working case
>>>>>>>>> **** List of PLAYBACK Hardware Devices ****
>>>>>>>>> card 0: SB [HDA ATI SB], device 0: AD198x Analog [AD198x Analog]
>>>>>>>>> Â  Subdevices: 1/1
>>>>>>>>> Â  Subdevice #0: subdevice #0
>>>>>>>>> card 0: SB [HDA ATI SB], device 1: AD198x Digital [AD198x Digital]
>>>>>>>>> Â  Subdevices: 1/1
>>>>>>>>> Â  Subdevice #0: subdevice #0
>>>>>>>>> card 2: Generic [HD-Audio Generic], device 3: HDMI 0 [HDMI 0]
>>>>>>>>> Â  Subdevices: 1/1
>>>>>>>>> Â  Subdevice #0: subdevice #0
>>>>>>>> Sorry, there's of course no playback on a webcam. Try 'arecord -l'
>>>>>>>> instead, please.
>>>>>>>>
>>>>>>>>
>>>>>>>> Daniel
>>>>>>>>
>>>>>>> Output of non-working case
>>>>>>> **** List of CAPTURE Hardware Devices ****
>>>>>>> card 0: SB [HDA ATI SB], device 0: AD198x Analog [AD198x Analog]
>>>>>>>       Subdevices: 3/3
>>>>>>>       Subdevice #0: subdevice #0
>>>>>>>       Subdevice #1: subdevice #1
>>>>>>>       Subdevice #2: subdevice #2
>>>>>>> card 1: Webcam [Trust 2MP Auto Focus Webcam], device 0: USB Audio [USB
>>>>>>> Audio]
>>>>>>>       Subdevices: 1/1
>>>>>>>       Subdevice #0: subdevice #0
>>>>>>>
>>>>>>>
>>>>>>> Output of working case
>>>>>>> **** List of CAPTURE Hardware Devices ****
>>>>>>> card 0: SB [HDA ATI SB], device 0: AD198x Analog [AD198x Analog]
>>>>>>>       Subdevices: 3/3
>>>>>>>       Subdevice #0: subdevice #0
>>>>>>>       Subdevice #1: subdevice #1
>>>>>>>       Subdevice #2: subdevice #2
>>>>>>> card 1: default [Trust 2MP Auto Focus Webcam ], device 0: USB Audio [USB
>>>>>>> Audio]
>>>>>>>       Subdevices: 1/1
>>>>>>>       Subdevice #0: subdevice #0
>>>>>>>
>>>>>> Try 'arecord -f cd -Dplughw:1 foo.wav' and see if that works. For
>>>>>> whatever reason, the webcam is not the default in the non-working case.
>>>>>> Are you using the same userspace and configs in both cases?
>>>>>>
>>>>>>
>>>>>> Daniel
>>>>>>
>>>>> Unfortunately it doesn't work...voice is recorded only in 1.0.23 alsa
>>>>> version.
>>>>> In above version nothing is recorded.
>>>>> I use the same Ubuntu release just the kernel changes
>>>>> 1.0.23 alsa is in kernel 2.6.38
>>>>> newer alsa versions that don't work are in newer kernels.
>>>> I still think it is all related to configs and settings. Can you please
>>>> go check all relevant volume settings and routing switches with amixer
>>>> or alsamixer? The fact that the default changes tells me that
>>>> something's different in the behaviour in which ALSA handles the devices.
>>>>
>>>> Also note that 1.0.24 is rather ancient already, and while the driver
>>>> has seen quiet some refactoring lately, I haven't heard about
>>>> regressions in that version yet - and I'm sure we would have gotten a
>>>> whole lot of reports if there was such a tremendous breakage. And
>>>> there's no signs of errors in the kernel logs either. But you never
>>>> know, of course.
>>>>
>>>>
>>>> Daniel
>>>>
>>> Alsamixer working casehttp://imagebin.org/226143
>>> Alsamixer non-working casehttp://imagebin.org/226142
>>>
>>> I also attach amixer output for both cases.
>>>
>> Both in the images and in the text output you seem to have missed
>> pointing amixer/alsamixer the correct device. alsamixer is also in the
>> playback pane, which doesn't exist for the Webcam.
>>
>> Try 'alsamixer -c1 -V capture'
>>
> I finally figured it out with amixer command
> non working version gives me this output
> 
> kostas at kostas-home:~$ amixer -c1
> Simple mixer control 'Mic',0
> Â  Capabilities: cvolume cvolume-joined cswitch cswitch-joined penum
> Â  Capture channels: Mono
> Â  Limits: Capture 0 - 4096
> Â  Mono: Capture 2723 [66%] [10.63dB] [on]
> 
> The working version gives this output
> kostas at kostas-home:~$ amixer -c1
> Simple mixer control 'Mic',0
>    Capabilities: cvolume cvolume-joined cswitch cswitch-joined penum
>    Capture channels: Mono
>    Limits: Capture 0 - 4096
>    Mono: Capture 4096 [100%] [16.00dB] [on]

Ok, thanks. In the given case, I have to ask you to do a git bisect.
That will point us to the commit that causes your problems. Sorry that I
can't help you any further right now, it's just unclear which commit in
the ancient history causes your problem.

See here for instructions on how to do that:

  https://www.kernel.org/pub/software/scm/git/docs/git-bisect.html
  http://git-scm.com/book/en/Git-Tools-Debugging-with-Git


Thanks for your help and patience,
Daniel

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