| 2020-02-11 03:12:19 |
Hui Wang |
description |
In the ubuntu-20.04, we integrate the alsa-lib-1.2.1.2, and the ucm for this version is alsa-ucm-conf-1.2.1.2, in this package, the ucm2 folder is named by changed card name and longname (patches are in the v5.5-rc1).
To make the focal kernel work with alsa-lib-1.2.1.2, we need to backport those patches. |
In the ubuntu-20.04, we integrate the alsa-lib-1.2.1.2, and from the
alsa-lib-1.2.1, the ucm is put into a standalone package alsa-ucm-conf,
and from the 1.2.1, the alsa-lib supports the ucm2.
In the alsa-ucm-conf-1.2.1.2, the ucm2 folders are named by new
card name or longname, kernel-v5.5-rc1 has patches to change those
names to new names. now we backport them to focal kernel.
[Impact]
booting with the focal kernel, the audio driver can't find the ucm2
confs, that is becuase alsa-lib-1.2.1 requires new cardname and long
name, but focal kernel provides the old card names.
[Fix]
backport 3 patches from v5.5-rc1.
[Test Case]
install the 20.04 daily build image, install the linux-firmware and
alsa-ucm-conf, booting with the kernel which have those 3 patches,
the alsa-lib could find the correct ucm2 confs.
[Regression Risk]
It is low risk to focal.
If users install focal kernel to bionic or disco, it will break
the audio since the ucm in the bionic and disco still follow the old
card name and longname, we need to link a new copy ucm named by new
cardname or longname in the bionic and disco. |
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