BTW, this SRU is not backported from upstream of alsa-lib and this SRU is not going to be submitted to upstream. That is because the latest alsa-lib already supported the ucm2 and with ucm2 all machines could share one ucm, so there is no this problem for latest alsa-lib. This problem is only specific to the alsa-lib of Eoan and Bionic.
** Description changed: + This SRU is not backported from upstream of alsa-lib and this SRU is not + going to be submitted to upstream. That is because the latest alsa-lib + already supported the ucm2 and with ucm2 all machines could share one + ucm, so there is no this problem for latest alsa-lib. This problem is + only specific to the alsa-lib of Eoan and Bionic. + [Impact] On some lenovo notebooks, ucm files are not loaded and mic can't be used [Fix] UCM was loaded based on cardlongname, but that can't cover all configs of the same model. Lenovo suggested to load ucm by the first 3 letters of /sys/devices/virtual/dmi/id/bios_version, so that all configs could use just one ucm. [Test Case] after applying this patch, I installed the testing alsa-lib on lenovo X1C7 and Dell vostro5390 which are all machines with the dmic connected to pch, after booing up, I checked the /usr/share/alsa/ucm/, the LENOVO-BIOSID-xxx folders are there, and the LENOVO machine loaded the N2H/*.conf, it worked well, the Dell machine still loaded the ucm by cardname, it worked as good as before. [Regression Potential] low, just add some new ucms and let LENOVO machine find the ucm by bios_version if it fails by cardlongname. And already tested the change on lenovo and dell machines. ** Tags added: originate-from-1862577 sutton -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1868210 Title: [SRU] Load ucm on Lenovo notebooks based on bios version To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1868210/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
