A friend of mine has a Carbon 7th-gen and did the following update this
morning:
```
Start-Date: 2020-03-29 09:23:18
Commandline: apt-get upgrade
Requested-By: christoph (1000)
Upgrade: fdiskämd64 (2.31.1-0.4ubuntu3.5, 2.31.1-0.4ubuntu3.6),
uuid-runtimeämd64 (2.31.1-0.4ubuntu3.5, 2.31.1-0.4ubuntu3.6),
libfdisk1ämd64 (2.31.1-0.4ubuntu3.5, 2.31.1-0.4ubuntu3.6),
libasound2-dataämd64 (1.1.3-5ubuntu0.2, 1.1.3-5ubuntu0.4),
libmount1ämd64 (2.31.1-0.4ubuntu3.5, 2.31.1-0.4ubuntu3.6),
util-linuxämd64 (2.31.1-0.4ubuntu3.5, 2.31.1-0.4ubuntu3.6), mountämd64
(2.31.1-0.4ubuntu3.5, 2.31.1-0.4ubuntu3.6), libblkid1ämd64
(2.31.1-0.4ubuntu3.5, 2.31.1-0.4ubuntu3.6), libuuid1ämd64
(2.31.1-0.4ubuntu3.5, 2.31.1-0.4ubuntu3.6), libsmartcols1ämd64
(2.31.1-0.4ubuntu3.5, 2.31.1-0.4ubuntu3.6), rfkillämd64
(2.31.1-0.4ubuntu3.5, 2.31.1-0.4ubuntu3.6), uuid-devämd64
(2.31.1-0.4ubuntu3.5, 2.31.1-0.4ubuntu3.6), bsdutilsämd64
(1:2.31.1-0.4ubuntu3.5, 1:2.31.1-0.4ubuntu3.6), libasound2ämd64
(1.1.3-5ubuntu0.2, 1.1.3-5ubuntu0.4)
End-Date: 2020-03-29 09:23:34
```
After a reboot, his sound output stopped working as well as the
microphone input. The change from libasouns@1.1.3-5ubuntu0.2 to
libasound@1.1.3-5ubuntu0.4 seems, given the diff, to be the most likely
root cause for this. In the kernel messages we can see the following:
```
[ 21.624861] HDMI HDA Codec ehdaudio0D2: Max dais supported: 3
[ 21.626971] snd_soc_skl 0000:00:1f.3: Direct firmware load for
9dc8-LENOVO-TP-N2H-4704-tplg.bin failed with error -2
[ 21.626973] snd_soc_skl 0000:00:1f.3: tplg fw
9dc8-LENOVO-TP-N2H-4704-tplg.bin load failed with -2, falling back to
dfw_sst.bin
[ 21.628197] snd_soc_skl 0000:00:1f.3: Direct firmware load for dfw_sst.bin
failed with error -2
[ 21.628198] snd_soc_skl 0000:00:1f.3: Fallback tplg fw dfw_sst.bin load
failed with -2
[ 21.628200] snd_soc_skl 0000:00:1f.3: Failed to init topology!
[ 21.628201] snd_soc_skl 0000:00:1f.3: ASoC: failed to probe component -2
[ 21.628213] skl_hda_dsp_generic skl_hda_dsp_generic: ASoC: failed to
instantiate card -2
[ 21.628229] skl_hda_dsp_generic: probe of skl_hda_dsp_generic failed with
error -2
```
I'm currently posting this for him as after some attempts to downgrade
there is a problem with booting altogether. Is someone able to confirm
that this change likely caused this and possibly what we can do to fix
it / what other information we'd need to provide? Thanks!
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https://bugs.launchpad.net/bugs/1859754
Title:
[SRU] add ucm to make alsa/sof driver work under PA (variants of
Lenovo X1 Carbon 7th, Dell cnl and cml machines)
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