** Summary changed: - [Lenovo ThinkPad T14 Gen 1] No sound output device on startup + [SRU][Lenovo ThinkPad T14 Gen 1] No sound output device on startup
** Description changed: - After logging in, only a dummy device is available for audio playback - (resulting in no audible playback). When running "pactl load-module - module-detect" the sound card shows up, and playback works as expected. + [Impact] + On the machines with AMD Ryzen acp audio design, the audio can't work + anymore after upgrading the libasound2 to ubuntu3(groovy)/ubuntu2.1( + focal), this is a regression on libasound2 for those machines. the AMD + Ryzen acp audio card needs to load ucm to work with pulseaudio, but + this audio card doesn't have an independant ucm for it, it needs to + link to an existing HDA-Intel ucm, the check_empty_configuration() needs + to cover the situation that Linked is true, otherwise it will fail + to load the ucm for the audio card. Even the audio card could load the + ucm, the output is muted and the init output volume is too low if + freshly install the OS on these machines. + + [Fix] + Backport 1 alsa-lib patch to fix the failure of loading ucm on AMD + Ryzen acp audio machines. Backport 4 alsa-ucm-conf patches to fix + init mute and init output volume problem. + + [Test Case] + Install the updated libasuond2, rm ~/.config/pulse/*; sudo rm -rf + /var/lib/alsa/*; sudo sh -c 'echo b > /proc/sysrq-trigger' and run pacmd + list-cards, we could see the pulseaudio load the ucm successfully and we could see + the sound card is generated and all output and input devices are listed + under sound card, but the init output is muted and the volume is very low + if we manually unumte it. Now install the updated alsa-ucm-conf, rm ~/.config/pulse/*; sudo rm -rf + /var/lib/alsa/*; sudo sh -c 'echo b > /proc/sysrq-trigger', the output is + not muted anymore and the output volume is OK to most users. + + [Regression Risk] + This could make the machines with sof audio driver fail to load ucm + , then all audio function can't work as before, like the speaker can't + output sound or the internal mic can't be found or can't record sound. + But this possibility is very low, I tested this SRU on some machines with or + without sof audio driver, all worked as well as before. + + + After logging in, only a dummy device is available for audio playback (resulting in no audible playback). When running "pactl load-module module-detect" the sound card shows up, and playback works as expected. If pulseaudio is restarted with "pulseaudio -k" the playback device disappears again. Running the above command get things working again. If I change the following section in /etc/pulse/default.pa from: ### Automatically load driver modules depending on the hardware available .ifexists module-udev-detect.so load-module module-udev-detect .else ### Use the static hardware detection module (for systems that lack udev support) load-module module-detect .endif To: ### Automatically load driver modules depending on the hardware available #.ifexists module-udev-detect.so #load-module module-udev-detect #.else ### Use the static hardware detection module (for systems that lack udev support) load-module module-detect #.endif Things start working as they should after running "pulseaudio -k". ProblemType: Bug DistroRelease: Ubuntu 20.10 Package: pulseaudio 1:13.99.2-1ubuntu1 ProcVersionSignature: Ubuntu 5.8.0-26.27-generic 5.8.14 Uname: Linux 5.8.0-26-generic x86_64 ApportVersion: 2.20.11-0ubuntu50 Architecture: amd64 CasperMD5CheckResult: skip CurrentDesktop: KDE Date: Wed Oct 28 17:21:02 2020 InstallationDate: Installed on 2020-10-23 (4 days ago) InstallationMedia: Kubuntu 20.10 "Groovy Gorilla" - Release amd64 (20201022) SourcePackage: pulseaudio UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 08/07/2020 dmi.bios.release: 1.9 dmi.bios.vendor: LENOVO dmi.bios.version: R1BET40W(1.09 ) dmi.board.asset.tag: Not Available dmi.board.name: 20UDCTO1WW dmi.board.vendor: LENOVO dmi.board.version: Not Defined dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: None dmi.ec.firmware.release: 1.9 dmi.modalias: dmi:bvnLENOVO:bvrR1BET40W(1.09):bd08/07/2020:br1.9:efr1.9:svnLENOVO:pn20UDCTO1WW:pvrThinkPadT14Gen1:rvnLENOVO:rn20UDCTO1WW:rvrNotDefined:cvnLENOVO:ct10:cvrNone: dmi.product.family: ThinkPad T14 Gen 1 dmi.product.name: 20UDCTO1WW dmi.product.sku: LENOVO_MT_20UD_BU_Think_FM_ThinkPad T14 Gen 1 dmi.product.version: ThinkPad T14 Gen 1 dmi.sys.vendor: LENOVO -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1901922 Title: [SRU][Lenovo ThinkPad T14 Gen 1] No sound output device on startup To manage notifications about this bug go to: https://bugs.launchpad.net/pulseaudio/+bug/1901922/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
