The Speaker / Microphone worked perfectly with linux kernel 4.12, and still does if I reboot into that kernel. But it doesn't work with 4.13, or 4.13.1 which I just installed (from mainline kernel repository). Haven't tried 4.14 yet.
ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 4.13.0-12.13-generic 4.13.3
Uname: Linux 4.13.0-12-generic x86_64
ApportVersion: 2.20.7-0ubuntu1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: peter 2150 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Fri Sep 29 13:24:11 2017
EcryptfsInUse: Yes
InstallationDate: Installed on 2017-06-19 (101 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170617)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Title: Bluetooth sound card not detected
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/01/2016
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: F.20
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 827E
dmi.board.vendor: HP
dmi.board.version: 94.54
dmi.chassis.type: 31
dmi.chassis.vendor: HP
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF.20:bd12/01/2016:svnHP:pnHPSpectrex360Convertible13-ac0XX:pvr:rvnHP:rn827E:rvr94.54:cvnHP:ct31:cvrChassisVersion:
dmi.product.family: 103C_5335KV HP Spectre
dmi.product.name: HP Spectre x360 Convertible 13-ac0XX
dmi.sys.vendor: HP
4.14-rc2 doesn't work either, with the added bonus that it broke my wifi.