[yocto] [meta-raspberrypi][PATCH] make sound work out of the box for raspberrypi2

[Alex J Lennon]

On 24/03/2015 12:21, Gary Thomas wrote:
> On 2015-03-24 02:40, Alex J Lennon wrote:
>>
>>
>> On 24/03/2015 09:21, Alex J Lennon wrote:
>>>
>>> On 24/03/2015 08:21, Andreas Müller wrote:
>>>> On Tue, Mar 24, 2015 at 12:14 AM, Gary Thomas<gary at mlbassoc.com> 
>>>> wrote:
>>>>> On 2015-03-23 16:22, Andreas Müller wrote:
>>>>>> On Mon, Mar 23, 2015 at 10:43 PM, Gary Thomas<gary at mlbassoc.com> 
>>>>>> wrote:
>>>>>>> On 2015-03-23 14:57, Andreas Müller wrote:
>>>>>>>> On Mon, Mar 23, 2015 at 4:59 PM, Gary
>>>>>>>> Thomas<gary at mlbassoc.com>  wrote:
>>>>>>>>> On 2015-03-22 14:21, Andreas Müller wrote:
>>>>>>>>>>
>>>>>>>>>> Signed-off-by: Andreas Müller<schnitzeltony at googlemail.com>
>>>>>>>>>> ---
>>>>>>>>>>      ...-during-boot-by-compiling-SND_BCM2835-int.patch | 38
>>>>>>>>>> ++++++++++++++++++++++
>>>>>>>>>>      recipes-kernel/linux/linux-raspberrypi_3.18.bb     |  8
>>>>>>>>>> +++--
>>>>>>>>>>      2 files changed, 43 insertions(+), 3 deletions(-)
>>>>>>>>>>      create mode 100644
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> recipes-kernel/linux/linux-raspberrypi/0001-start-sound-during-boot-by-compiling-SND_BCM2835-int.patch
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> I tried this patch (which downloaded very strangely using
>>>>>>>>> Thunderbird)
>>>>>>>>> and
>>>>>>>>> the
>>>>>>>>> kernel rebuilt fine.  I now have the audio detected, but still
>>>>>>>>> no sound
>>>>>>>>> :-(
>>>>>>>>> Again I've tried the internal (phono) speakers as well as HDMI
>>>>>>>>> audio.
>>>>>>>>>
>>>>>>>>> Just to prove a point on the [brand new] hardware, I installed
>>>>>>>>> OpenELEC
>>>>>>>>> (XBMC)
>>>>>>>>> and it works fine using the HDMI audio.  Sadly when I tried
>>>>>>>>> Raspbian
>>>>>>>>> and
>>>>>>>>> Ubuntu
>>>>>>>>> there was no sound either...
>>>>>>>>>
>>>>>>>>> Were you (Andreas) able to get any sound with this patch?
>>>>>>>>>
>>>>>>>> Yes but I have used 3.5mm sound output - Should have mentioned
>>>>>>>> that in
>>>>>>>> commit. I guess there is to enable something else in kernel
>>>>>>>> config for
>>>>>>>> HDMI. Will look into that
>>>>>>>
>>>>>>> I've tried the 3.5mm jack as well but nothing seems to come out.
>>>>>>> I even tried booting with the HDMI missing (powered off) in case
>>>>>>> that was causing some confusion.
>>>>>>>
>>>>>>> Did you make any changes to config.txt to get this going?
>>>>>> No
>>>>>> Have my standard xfce-image with xfce4-mixer and as mentioned out of
>>>>>> the box: I can hear sound / change volume...
>>>>> Would it be possible to share your [bootable] image?
>>>>>
>>>>>> What does happen if you start alsamixer - if it is installed on your
>>>>>> image?
>>>>> alsamixer looks correct.
>>>>>
>>>>> BTW, I've tried this on my RaspberryPi Model B and I don't get any
>>>>> sound
>>>>> from it either :-(  Again, booting with test_mode=1 shows that the
>>>>> hardware
>>>>> is working, just not in Linux. I'm sure I've tried this in the
>>>>> past with
>>>>> success so I'm becoming more and more confused...
>>>>>
>>>> For sharing I need to create a smaller image - the current one
>>>> contains all stuff from meta-games, all browsers and more. Hope to get
>>>> that done tomorrow evening. What is the preferred way of sharing huge
>>>> files?
>>>>
>>> Circling around this a little, hello_audio built out of vc_graphics
>>> works too over the audio jack
>>>
>>> Alex
>>>
>>
>> OK I got some life from GStreamer and my RPIv2
>>
>> Install amixer
>>
>> modprobe snd_bcm2835 (or presumably use an image with audio built-in)
>>
>> amixer cset numid=3 1 (to set output to audio jack)
>>
>> gst-launch-1.0 audiotestsrc ! alsasink
>>
>> I get a tone out of the audio jack. So some kind of audio routing
>> defaults issue.
>
> Indeed, this does work - tested on RaspberryPi and RaspberryPi2.
>
> Now, to figure out how to make audio over HDMI work.
>

I don't have HDMI audio kit with me here but there are some bits and
bobs here which might help

http://raspberrypi.stackexchange.com/questions/22708/is-there-some-trick-to-getting-aplay-audio-output-working

I'd be wont to try

|amixer cset numid=3 2|


For starters to try to force HDMI output

Some other bits and pieces on ALSA in there I see, which might be relevant

Cheers, Alex




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