Hi, although sound has been reported to work with this device (e.g. here: https://bugzilla.kernel.org/show_bug.cgi?id=113151 ) I am not able to make it work (with Stretch), maybe someone here has managed to do so and can give me a hint?
I compiled a 4.14.0 kernel with a .config someone who reported sound to work sent me, so I assume the drivers are all present and functional. My prime suspect is the firmware, so I tried and removed the debian firmware packages and installed the latest Ubuntu linux-firmware package (1.170) instead, which appears to be more complete (and possibly more to-date) than its debian counterparts, but still no luck. I also updated intel-microcode to the latest version from Sid, just in case that matters. Still when I try to play back some audio file with plain alsa I get an error like: $ aplay Noise.wav Playing WAVE 'Noise.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Mono aplay: set_params:1363: Unable to install hw params: (...) I also tried to use pulseaudio with the ucm files from https://github.com/plbossart/UCM/tree/master/bytcr-rt5640 that have been reported to do the trick, but still no luck, PA floods the syslog with messages like [ 82.649840] intel_sst_acpi 80860F28:00: FW Version 01.0c.00.01 [ 82.650272] Baytrail Audio Port: ASoC: no backend DAIs enabled for Baytrail Audio Port (...) The card shows up in /proc/asound/cards but I cannot seem to find a way to make it work, and it is quite hard to find useful information on the web. Does anyone have an idea what I could try next? Is still some firmware missing or is it rather a configuration issue? Best regards and TIA Michael .-.. .. ...- . .-.. --- -. --. .- -. -.. .--. .-. --- ... .--. . .-. I object to intellect without discipline; I object to power without constructive purpose. -- Spock, "The Squire of Gothos", stardate 2124.5