Return no option for backports install

ocate package chimaera-updates
devuan@devuan:~$ sudo apt install -t chimaera-backports
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 172 not upgraded.

as I remember in debian need to install and enable backports, how I do it into Devaun

Same as with Debian but with a different repository:

https://www.devuan.org/os/packages ← see the "Add backports" section.

EDIT: the advice in that section is wrong though because the backports repository should be left enabled to ensure the backported packages are kept updated; this is particularly critical for the kernel metapackage.[1]

The backports repository's InRelease file has these lines:

NotAutomatic: yes
[snip]
ButAutomaticUpgrades: yes

^ Those confer a pin value of 100 and ensures that packages can only be installed explicitly (eg, apt install -t chimaera-backports) but also that they will be kept updated from backports once installed.

[1] I've also had this argument with the MX Linux developers. I am right.

/usr/share/alsa/ucm2/codecs/max98090/EnableSeq.conf
/usr/share/alsa/ucm2/codecs/max98090/Headphones.conf
/usr/share/alsa/ucm2/codecs/max98090/HeadsetMic.conf
/usr/share/alsa/ucm2/codecs/max98090/InternalMic.conf
/usr/share/alsa/ucm2/codecs/max98090/Speaker.conf

alsa list

How  can i enable it,  as I remember in debian need to install and enable backports, how I do it into Devaun.

Thanks