ok, now gnome-shell 43.0-2 together with libmutter-11-0 is placed in debian testing. And the screen gets black. `dmesg` output:

```
[   23.326587] apple-mca 39b600000.mca: ASoC: error at snd_soc_dai_hw_params on mca-pcm-0: -22
[   23.326593]  Primary: ASoC: __soc_pcm_hw_params() failed (-22)
[   23.326594]  Primary: ASoC: dpcm_fe_dai_hw_params failed (-22)
```

in loop