@Hui I did a new round of test.
1. purged alsa-ucm-conf and installed alsa-ucm-conf 1.2.2-1ubuntu0.4.1+test from your ppa 2. tested sound on 4 kernels a. mainline generic 5.8.13 and 5.6.19: sound is working fine, Skype echo test included, headset jack plugging and unplugging are managed with no issue b. 5.4.48 and 5.6.0 1020 oem: sound becomes garbled/crackling, instability on jack plugging and unplugging, Skype not usable My conclusion: there's some problematic interaction with the standard kernels. Does it make sense me to test groovy? It's kernel 5.8 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to the bug report. https://bugs.launchpad.net/bugs/1871306 Title: [SRU]No sound from internal card chtmax98090 - missing UCM2 files in alsa-ucm-conf 1.2.2, available in alsa-ucm-conf 1.2.3 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-ucm-conf/+bug/1871306/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
