[Bug 1868210] Re: [SRU] Load ucm on Lenovo notebooks based on bios version

[Launchpad Bug Tracker]

This bug was fixed in the package alsa-lib - 1.1.9-0ubuntu1.3

---------------
alsa-lib (1.1.9-0ubuntu1.3) eoan; urgency=medium

  * d/p/0010-add-bios-version-for-looking-for-ucm.patch
    Add a new way to looking for the ucm by DMI bios_version.
    Without this patch, the alsa-lib looks for the ucm by cardlongname
    first, if it fails, then by the cardname. This has a problem at least
    on LENOVO machines, since a LENOVO model has the same audio design but
    it has hundreds of cardlongname, we need to create hundreds of folders
    for one model, that is unacceptable. LENOVO told us a LENOVO model has
    the unique biso_version, we could use it to find the ucm. After applying
    this patch, the alsa-lib looks for the ucm by cardlongname first, if it
    fails, it will use bios_version, if it also fails, it will fallback to
    cardname.
    (LP: #1868210)

 -- Hui Wang <hui.wang at canonical.com>  Fri, 27 Mar 2020 11:40:37 +0800

** Changed in: alsa-lib (Ubuntu Eoan)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1868210

Title:
  [SRU] Load ucm on Lenovo notebooks based on bios version

Status in HWE Next:
  New
Status in alsa-lib package in Ubuntu:
  Invalid
Status in alsa-lib source package in Bionic:
  Fix Committed
Status in alsa-lib source package in Eoan:
  Fix Released
Status in alsa-lib source package in Focal:
  Invalid

Bug description:
  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 supports ucm2, and with ucm2 all machines could share
  one ucm, so latest alsa-lib does not have this problem. This problem
  is only specific to the alsa-lib in Bionic and Eoan.

  [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, install the testing alsa-lib on Lenovo X1C7 and Dell vostro 5390, which are all machines with the DMIC connected to PCH. After system bootup, check the /usr/share/alsa/ucm/ for the presence of LENOVO-BIOSID-xxx directories.

  Lenovo X1C7 should load the N2H/*.conf and verify the audio
  functionalities. The Dell machine should still load the ucm by
  cardname, and it should work 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. I've already tested the change on Lenovo and Dell machines.

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