Here is the magic sequence of CORB commands needed to enable both speakers. This is actually part of a much larger sequence that the Windows driver does, but through trial and error, this is the minimum required to make both speakers work.
I can attach the full PCI I/O and CORB logs if needed, but it's 4.6Mb. I have no idea what these commands do, but nid 0x6 is a DAC and 0x20 is a vendor-specific nid. It looks like the same sequence repeating over and over, but the params to 0x400 and 0x500 commands change slightly. nid:0x6 verb:0x73e param:0x0 nid:0x20 verb:0x500 param:0x26 nid:0x20 verb:0xc00 param:0x0 nid:0x20 verb:0x500 param:0x26 nid:0x20 verb:0xc00 param:0x0 nid:0x6 verb:0x73e param:0x80 nid:0x20 verb:0x500 param:0x26 nid:0x20 verb:0xc00 param:0x0 nid:0x20 verb:0x500 param:0x26 nid:0x20 verb:0x4f0 param:0x0 nid:0x20 verb:0x500 param:0x22 nid:0x20 verb:0x400 param:0x31 nid:0x20 verb:0x500 param:0x23 nid:0x20 verb:0x400 param:0xb nid:0x20 verb:0x500 param:0x25 nid:0x20 verb:0x400 param:0x0 nid:0x20 verb:0x500 param:0x26 nid:0x20 verb:0x4b0 param:0x10 nid:0x6 verb:0x73e param:0x0 nid:0x20 verb:0x500 param:0x26 nid:0x20 verb:0xc00 param:0x0 nid:0x20 verb:0x500 param:0x26 nid:0x20 verb:0x4b0 param:0x0 nid:0x20 verb:0x500 param:0x26 nid:0x20 verb:0xc00 param:0x0 nid:0x21 verb:0xf09 param:0x0 nid:0x6 verb:0x73e param:0x80 nid:0x20 verb:0x500 param:0x26 nid:0x20 verb:0xc00 param:0x0 nid:0x20 verb:0x500 param:0x26 nid:0x20 verb:0x4f0 param:0x0 nid:0x20 verb:0x500 param:0x23 nid:0x20 verb:0x400 param:0xc nid:0x20 verb:0x500 param:0x25 nid:0x20 verb:0x400 param:0x0 nid:0x20 verb:0x500 param:0x26 nid:0x20 verb:0x4b0 param:0x10 nid:0x6 verb:0x73e param:0x0 nid:0x20 verb:0x500 param:0x26 nid:0x20 verb:0xc00 param:0x0 nid:0x20 verb:0x500 param:0x26 nid:0x20 verb:0x4b0 param:0x0 nid:0x20 verb:0x500 param:0x26 nid:0x20 verb:0xc00 param:0x0 nid:0x6 verb:0x73e param:0x80 nid:0x20 verb:0x500 param:0x26 nid:0x20 verb:0xc00 param:0x0 nid:0x20 verb:0x500 param:0x26 nid:0x20 verb:0x4f0 param:0x0 nid:0x20 verb:0x500 param:0x23 nid:0x20 verb:0x400 param:0xd nid:0x20 verb:0x500 param:0x25 nid:0x20 verb:0x400 param:0x0 nid:0x20 verb:0x500 param:0x26 nid:0x20 verb:0x4b0 param:0x10 nid:0x6 verb:0x73e param:0x0 nid:0x20 verb:0x500 param:0x26 nid:0x20 verb:0xc00 param:0x0 nid:0x20 verb:0x500 param:0x26 nid:0x20 verb:0x4b0 param:0x0 nid:0x20 verb:0x500 param:0x26 nid:0x20 verb:0xc00 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param:0x26 nid:0x20 verb:0xc00 param:0x0 nid:0x6 verb:0x73e param:0x80 nid:0x20 verb:0x500 param:0x26 nid:0x20 verb:0xc00 param:0x0 nid:0x20 verb:0x500 param:0x26 nid:0x20 verb:0x4f0 param:0x0 nid:0x20 verb:0x500 param:0x23 nid:0x20 verb:0x400 param:0x38 nid:0x20 verb:0x500 param:0x25 nid:0x20 verb:0x400 param:0x80 nid:0x20 verb:0x500 param:0x26 nid:0x20 verb:0x4b0 param:0x10 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1721987 Title: No sound from right audio channel Status in Linux: Confirmed Status in linux package in Ubuntu: Confirmed Bug description: No audio comes out of the right speaker on the laptop. When playing a test video such as https://www.youtube.com/watch?v=hTvJoYnpeRQ the right-channel audio is never heard (i.e., it does not get converted into mono and played through the left speaker). When plugging in headphones, audio is heard from both channels. In Windows, both speakers work, so it is not a physical problem with the speakers. ProblemType: Bug DistroRelease: Ubuntu 17.10 Package: linux-image-4.13.0-12-generic 4.13.0-12.13 [modified: boot/vmlinuz-4.13.0-12-generic] 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: user 1127 F.... pulseaudio CurrentDesktop: ubuntu:GNOME Date: Sat Oct 7 12:58:01 2017 InstallationDate: Installed on 2017-10-07 (0 days ago) InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170926) MachineType: HUAWEI HUAWEI MateBook X ProcEnviron: PATH=(custom, no username) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.13.0-12-generic.efi.signed root=UUID=f0a69f35-7c1e-4280-b325-6b7fec6e174a ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-4.13.0-12-generic N/A linux-backports-modules-4.13.0-12-generic N/A linux-firmware 1.168 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 08/14/2017 dmi.bios.vendor: HUAWEI dmi.bios.version: 1.12 dmi.board.name: HUAWEI MateBook X dmi.board.vendor: HUAWEI dmi.board.version: 2.0 dmi.chassis.type: 10 dmi.chassis.vendor: HUAWEI dmi.modalias: dmi:bvnHUAWEI:bvr1.12:bd08/14/2017:svnHUAWEI:pnHUAWEIMateBookX:pvr2.0:rvnHUAWEI:rnHUAWEIMateBookX:rvr2.0:cvnHUAWEI:ct10:cvr: dmi.product.family: HUAWEI MateBook dmi.product.name: HUAWEI MateBook X dmi.product.version: 2.0 dmi.sys.vendor: HUAWEI To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1721987/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
