I' m using a Mediacom W700 tablet (is like a SurfTab wintron 7.0 ST70416-6) with Lubuntu 18.04 (i also installed Ubuntu-dekstop but it has only 1 GB of ram).
How enable the speakers,microphone and camera?
Also the super (physical) button doesn' t work.
In hardinfo i see: Audio: bytcr-rt5651 - bytcr-rt5651.
So i used:

dmesg | grep bytcr
[   39.559314] bytcr_rt5651 bytcr_rt5651: quirk DMIC_MAP enabled
[   39.559319] bytcr_rt5651 bytcr_rt5651: quirk DMIC enabled
[   39.559322] bytcr_rt5651 bytcr_rt5651: quirk MCLK_EN enabled
[   39.581339] bytcr_rt5651 bytcr_rt5651: snd-soc-dummy-dai <-> media-cpu-dai mapping ok
[   39.581426] bytcr_rt5651 bytcr_rt5651: snd-soc-dummy-dai <-> deepbuffer-cpu-dai mapping ok
[   39.581557] bytcr_rt5651 bytcr_rt5651: rt5651-aif1 <-> ssp2-port mapping ok
[   39.581652] bytcr_rt5651 bytcr_rt5651: ASoC: no DMI vendor name!
[   39.583777] input: bytcr-rt5651 Headset as /devices/platform/80860F28:00/bytcr_rt5651/sound/card1/input6

I found this project on github, it seems perfect, it states:

To enable UCM on RT5651 platforms,

  1. copy directory to UCM location sudo cp -rf ../bytcr-rt5651 /usr/share/alsa/ucm

  2. update asound.state sudo cp asound.state /var/lib/alsa

UCM files should be detected and use with Pulseaudio 4.0 and above

I followed the step and i have pulseaudio above of 4.0.
If i run sudo sh asound.state in /var/lib/alsa i get:

asound.state: 1: asound.state: state.bytcrrt5651: not found
asound.state: 2: asound.state: control.1: not found
asound.state: 3: asound.state: iface: not found
asound.state: 4: asound.state: name: not found
asound.state: 5: asound.state: value: not found
asound.state: 6: asound.state: comment: not found
asound.state: 7: asound.state: access: not found
BOOLEAN: not found
asound.state: 9: asound.state: count: not found
asound.state: 10: asound.state: Syntax error: "}" unexpected

Other commands that may be useful:

aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Audio [Intel HDMI/DP LPE Audio], device 0: HdmiLpeAudio [Intel HDMI/DP LPE Audio]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: Audio [Intel HDMI/DP LPE Audio], device 1: HdmiLpeAudio [Intel HDMI/DP LPE Audio]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: bytcrrt5651 [bytcr-rt5651], device 0: 1 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: bytcrrt5651 [bytcr-rt5651], device 1: Deep-Buffer Audio (*) []
  Subdevices: 1/1
  Subdevice #0: subdevice #0

E: [pulseaudio] pid.c: Daemon already running.
E: [pulseaudio] main.c: pa_pid_file_create() failed.

Not sound at all from the speakers and the headphones.

  • Maybe this post about audio rendering in ubuntu may help. – oscar1919 Sep 12 '18 at 12:27
  • @oscar1919 good to know but is some hardware/driver problem. – Scorpion Sep 14 '18 at 9:14

In this project http://linuxiumcomau.blogspot.com/2017/06/customizing-ubuntu-isos-documentation.html you can find 6 files (4 scripts and 2 .deb) that are made for intel atom devices.
This files are for the bluetooth, wi-fi and audio. But you need the new kernel.
Wi-fi was already fine.

Kernel 4.18.15 audio working, pretty low max (speakers) volume, maybe is so by default.

Kernel 4.19 (not stable) also the bluetooth but i did not test it, now i have the stable kernel.

  • and the camera? – Scorpion Oct 31 '18 at 11:12

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