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

[Hui Wang]

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

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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:
  Confirmed
Status in alsa-lib source package in Eoan:
  Confirmed
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 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.

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