This seems to be triggered by connecting an external monitor over DisplayPort, then disconnecting. And rebooting does indeed clear the problem.
-- 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/1737264 Title: ALSA output is silent but SDL works fine Status in alsa-driver package in Ubuntu: New Bug description: Gnome error sounds do play, but sound output from Firefox and other applications doesn't work unless they can support a non-ALSA sound driver. E.g. mplayer makes no sound unless the "-ao sdl" or "-ao openal" parameter is added. ALSA and PulseAudio don't work. Reloading the ALSA kernel modules doesn't fix the problem. # alsa force-reload /sbin/alsa: Warning: Processes using sound devices: 1808(pulseaudio). Unloading ALSA sound driver modules: snd-hda-codec-hdmi snd-soc-rt5640 snd-soc-rl6231 snd-soc-core snd-hda-codec-conexant snd-hda-codec-generic snd-hda-intel snd-hda-codec snd-compress snd-pcm-dmaengine snd-hda-core snd-hwdep snd-seq-midi snd-seq-midi-event snd-pcm snd-rawmidi snd-seq snd-seq-device snd-timer snd-soc-sst-acpi snd-soc-sst-match (failed: modules still loaded: snd-hda-codec-hdmi snd-hda-codec-conexant snd-hda-codec-generic snd-hda-intel snd-hda-codec snd-hda-core snd-hwdep snd-pcm snd-timer). Loading ALSA sound driver modules: snd-hda-codec-hdmi snd-soc-rt5640 snd-soc-rl6231 snd-soc-core snd-hda-codec-conexant snd-hda-codec-generic snd-hda-intel snd-hda-codec snd-compress snd-pcm-dmaengine snd-hda-core snd-hwdep snd-seq-midi snd-seq-midi-event snd-pcm snd-rawmidi snd-seq snd-seq-device snd-timer snd-soc-sst-acpi snd-soc-sst-match. Unloading the kernel modules manually also fails. # rmmod snd-hda-codec-hdmi snd-hda-codec-conexant snd-hda-codec-generic snd-hda-intel snd-hda-codec snd-hda-core snd-hwdep snd-pcm snd-timer rmmod: ERROR: Module snd_hda_codec_hdmi is in use rmmod: ERROR: Module snd_hda_codec_conexant is in use rmmod: ERROR: Module snd_hda_codec_generic is in use by: snd_hda_codec_conexant rmmod: ERROR: Module snd_hda_intel is in use rmmod: ERROR: Module snd_hda_codec is in use by: snd_hda_intel snd_hda_codec_conexant snd_hda_codec_hdmi snd_hda_codec_generic rmmod: ERROR: Module snd_hda_core is in use by: snd_hda_intel snd_hda_codec_conexant snd_hda_codec snd_hda_codec_hdmi snd_hda_codec_generic rmmod: ERROR: Module snd_hwdep is in use by: snd_hda_codec rmmod: ERROR: Module snd_pcm is in use by: snd_hda_intel snd_hda_codec snd_pcm_dmaengine snd_hda_core snd_soc_rt5640 snd_hda_codec_hdmi snd_soc_core rmmod: ERROR: Module snd_timer is in use by: snd_seq snd_pcm No HDMI device is currently connected, but one was a few days ago. There have been several suspend-resume cycles since then. I expect that rebooting will clear this issue, however obviously that shouldn't be needed with Linux. ProblemType: Bug DistroRelease: Ubuntu 17.10 Package: alsa-base 1.0.25+dfsg-0ubuntu5 ProcVersionSignature: Ubuntu 4.13.0-17.20-generic 4.13.8 Uname: Linux 4.13.0-17-generic x86_64 ApportVersion: 2.20.7-0ubuntu3.6 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: pmj 1808 F.... pulseaudio /dev/snd/pcmC1D0c: pmj 1808 F...m pulseaudio /dev/snd/controlC1: pmj 1808 F.... pulseaudio CurrentDesktop: GNOME Date: Sat Dec 9 10:03:15 2017 InstallationDate: Installed on 2016-12-02 (370 days ago) InstallationMedia: Ubuntu-GNOME 16.10 "Yakkety Yak" - Release amd64 (20161012.1) PackageArchitecture: all SourcePackage: alsa-driver Symptom: audio Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH successful Symptom_Card: Built-in Audio - HDA Intel PCH Symptom_Jack: Black Headphone Out, Right Symptom_PulsePlaybackTest: PulseAudio playback test successful Symptom_Type: Only some of outputs are working Title: [UX303LAB, Conexant CX20751/2, Black Headphone Out, Right] Playback problem UpgradeStatus: Upgraded to artful on 2017-10-12 (57 days ago) dmi.bios.date: 08/25/2015 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: UX303LAB.210 dmi.board.asset.tag: ATN12345678901234567 dmi.board.name: UX303LAB 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.:bvrUX303LAB.210:bd08/25/2015:svnASUSTeKCOMPUTERINC.:pnUX303LAB:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUX303LAB:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0: dmi.product.family: UX dmi.product.name: UX303LAB 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/1737264/+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
