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

[Alex J Lennon]

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.

Alex

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