alsa-project/alsa-ucm-conf pull request #201 was opened from alpernebbi:
The rk3399-gru-kevin board has problems when trying to simultaneously playback and record audio with the default PulseAudio sample rate of 44.1KHz. When the following command is run, the playback starts a few seconds after the recording finishes.
arecord -vvv -d 4 /dev/null & sleep 0.2; speaker-test -l 1 -p 100000 -t sine
When the sample rates are set to 48KHz either with PA configuration or in the UCM, playback and recording both start immediately. Another example is when a music player is running and we start `arecord`, the music starts stuttering but `arecord` can't record anything either.
Apparently, this is a hardware limitation due to the I2S lines being shared between the devices. Set all the device rates to 48KHz like Chrome OS does to make things work smoothly.
[1] https://chromium-review.googlesource.com/389695 [2] https://chromium-review.googlesource.com/898682
Request URL : https://github.com/alsa-project/alsa-ucm-conf/pull/201 Patch URL : https://github.com/alsa-project/alsa-ucm-conf/pull/201.patch Repository URL: https://github.com/alsa-project/alsa-ucm-conf