imx6 hdmi audio Hardware Device is not present in user space after kernel detected.

[YamilGarcia]

I'm trying imx6 using Nitrogen6X board from boundary device to evaluate the multimedia capabilities of imx6, the rootfs was created by linuxlink tool from timesys.

When I use hdmi output as the audio device for gstreamer, gst-launch tool prompt the error showed below:

Playback open error on device 'hw:1,0': No such file or directory

When I check the playback hardware devices present in my board, the hdmi audio is not present as shown below:

# aplay -l

**** List of PLAYBACK Hardware Devices ****

card 0: sgtl5000audio [sgtl5000-audio], device 0: HiFi sgtl5000-0 []

  Subdevices: 1/1

  Subdevice #0: subdevice #0

#

But the kernel detected the hardware correctly when bootup, a portion of kernel output is shown below:

asoc: sgtl5000 <-> imx-ssi.1 mapping ok

imx_3stack asoc driver

asoc: mxc-hdmi-soc <-> imx-hdmi-soc-dai.0 mapping ok

ALSA device list:

  #0: sgtl5000-audio

  #1: imx-hdmi-soc

In user space I check that devices for audio were created correctly, as shown below:

# cat /proc/asound/cards

0 [sgtl5000audio  ]:  - sgtl5000-audio

                      sgtl5000-audio

1 [imxhdmisoc     ]:  - imx-hdmi-soc

                      imx-hdmi-soc

#

The kernel does not have any problem because I tryied with another rootfs and the hdmi audio device worked fine, but I would like to use this new rootfs which have support for many codecs.

Can someone help me to figure out what happen?

[zhaozhao]

Hi Yamil

     suppose your hdmi setting is :  

               HDMI        : /dev/fb2 <-----> /dev/video18

     you can try this:

                             $  echo 0 > /sys/class/graphics/fb2/blank

                              $  echo 1 > /sys/class/graphics/fb2/blank

     your hdmi audio output may be ok now.

[francoisrey]

I have the same problem, I use a rfs created by Timesys. Have you solve your problem ?

[bingking88]

  #1: imx-hdmi-soc, Is valid only when you use local HDMI！

[fengwei]

"aplay -l" behavior is mostly controlled by alsa-lib.

What's the difference between alsa-lib in old and new root fs? libasound2.so version at /usr/lib? alsa configurations at /usr/share/alsa?

[YamilGarcia]

The old rootfs was created by freescale LTIB L3.0.15_12.04.01 tool using alsa-lib-1.0.24.1.This rootfs works fine and always show both audio devices (sgtl5000-audio and hdmi-audio).

New rootfs was created by Timesys factory-20121015 tool using alsa-lib-1.0.25, but it only shows sgtl5000-audio devices.