I'm having the same issue. It seems we have the same laptop, based on what you attached. I think I have found some interesting details about this bug: 1) In my case, i'm dual booting with windows 10, the problem only occurs after booting into windows and then rebooting into ubuntu. A shutdown + start straight to ubuntu fixes the problem (I think this is why your sound came back). So, although this is a workaround, there is definitely something wrong. I describe the problem here in more detail https://askubuntu.com/q/1032543/172846 2) I think the problem is the windows Realtek drive putting the sound card in some kind of stand-by state that the linux driver cannot wake up from. Some people have reported with similar problems that downgrading the windows Realtek driver fixes the issue, but to me it is still clear that the problem is the linux driver not waking up correctly the device, not the windows driver using a feature intended to save power 3) With this idea that the problem is power-saving, I enabled the power-save feature in the linux driver: `echo 10 >/sys/module/snd_hda_intel/parameters/power_save` If I wait 10 seconds and then trigger a sound (i'm using a terminal's bell), the sound now works, it sounds weird at first (crackling) but it keeps improving after like 2 seconds where it sounds AFAICT normal, but then 2 seconds later the volume starts to decrease like when speakers are running out of battery until sound is completely gone again. So it seems the linux drivers are somewhat capable of waking up the sound card, but not permanently
** Attachment added: "alsa-info-not-working" https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1742852/+attachment/5138104/+files/alsa-info-not-working -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to alsa-driver in Ubuntu. https://bugs.launchpad.net/bugs/1742852 Title: [hostname, Realtek ALC294, Speaker, Internal] No sound at all after windows update Status in alsa-driver package in Ubuntu: Confirmed Bug description: After a windows update I lost all the sound on my ubuntu machine. It's the second time that this happends. My sound is unmuted and at a loud level and nothing is comming out of my speakers. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: alsa-base 1.0.25+dfsg-0ubuntu5 ProcVersionSignature: Ubuntu 4.13.0-26.29~16.04.2-generic 4.13.13 Uname: Linux 4.13.0-26-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.15 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: gbergeron 2408 F.... pulseaudio gbergeron 3656 F.... alsamixer CurrentDesktop: Unity Date: Thu Jan 11 22:21:23 2018 InstallationDate: Installed on 2017-11-29 (43 days ago) InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801) PackageArchitecture: all SourcePackage: alsa-driver Symptom: audio Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH failed Symptom_Card: Built-in Audio - HDA Intel PCH Symptom_DevicesInUse: USER PID ACCESS COMMAND /dev/snd/pcmC0D0p: gbergeron 2408 F...m pulseaudio /dev/snd/controlC0: gbergeron 2408 F.... pulseaudio gbergeron 3656 F.... alsamixer Symptom_Jack: Speaker, Internal Symptom_Type: No sound at all Title: [hostname, Realtek ALC294, Speaker, Internal] No sound at all UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 08/23/2017 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: UX430UAR.203 dmi.board.asset.tag: ATN12345678901234567 dmi.board.name: UX430UAR dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: 1.0 dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: ASUSTeK COMPUTER INC. dmi.chassis.version: 1.0 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrUX430UAR.203:bd08/23/2017:svnASUSTeKCOMPUTERINC.:pnUX430UAR:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUX430UAR:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0: dmi.product.family: UX dmi.product.name: UX430UAR dmi.product.version: 1.0 dmi.sys.vendor: ASUSTeK COMPUTER INC. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1742852/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
