Cannon Lake PCH cAVS (ALC892) not detected by kernel driver

[dmummenschanz at web.de]

   Hello,

   the audio chip Cannon Lake PCH cAVS ALC892 does not get recognized on
   my system. Only the HDMI devices are recognized.

   lspci shows the following audio device:
   00:1f.3 Audio device: Intel Corporation Cannon Lake PCH cAVS (rev 10)

   dmesg only shows:

   [  189.559786] snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops
   i915_exit [i915])
   [  189.581395] input: HDA Intel PCH HDMI/DP,pcm=3 as
   /devices/pci0000:00/0000:00:1f.3/sound/card0/input20
   [  189.581503] input: HDA Intel PCH HDMI/DP,pcm=7 as
   /devices/pci0000:00/0000:00:1f.3/sound/card0/input21
   [  189.581628] input: HDA Intel PCH HDMI/DP,pcm=8 as
   /devices/pci0000:00/0000:00:1f.3/sound/card0/input22
   [  189.581711] input: HDA Intel PCH HDMI/DP,pcm=9 as
   /devices/pci0000:00/0000:00:1f.3/sound/card0/input23
   [  189.581849] input: HDA Intel PCH HDMI/DP,pcm=10 as
   /devices/pci0000:00/0000:00:1f.3/sound/card0/input24


   ALSA-info file:
   http://alsa-project.org/db/?f=96102ee84f258d1cac83ed33795356550181511c

   There is a workaround availble:

   echo auto | tee /sys/devices/pci0000\:00/0000\:00\:1f.3/power/control
   echo 1 | tee /sys/devices/pci0000\:00/0000\:00\:1f.3/remove
   echo 1 | tee /sys/bus/pci/rescan

   unfortunately this doesn't work for me. The device never shows up.
   Sound on winX works fine on this device btw.
   I'm happy to assist with any attempts to make the sound work.