`spa.alsa: Errors in ALSA UCM profile for card Steinberg UR22C`

[0xlua]

alsaucm introduced a change in version v1.2.14, setting the UR22C to 4 HW channels instead of 2. This causes the spa.alsa: Errors in ALSA UCM profile for card Steinberg UR22C error for me.

The change was introduced because firmware 3.20 of the UR22C requires 4 HW channels, while I am on an older firmware right now. Updating the firmware seems to be only possible using the proprietary Windows tool. [1]

However alsaucm version v1.2.15 also introduced a fix.

So the error will fix itself once NixOS/nixpkgs#469812 is merged. I should still look into updating the firmware on my UR22C somehow.

[1] see discussion here: alsa-project/alsa-ucm-conf#547

[tomasmark79]

On fedora the Regex not works!

Dec 24 09:39:47 diamond alsactl[1867]: alsa-lib ucm_cond.c:155:(if_eval_regex_match) [error.ucm] Regex>
Dec 24 09:39:47 diamond alsactl[1867]: alsa-lib main.c:1804:(snd_use_case_mgr_open) [error.ucm] failed>

Comment "Steinberg UR22C USB-Audio"

Define.DirectPlaybackChannels 2
Define.DirectCaptureChannels 4

If.fw {
    Condition {
        Type RegexMatch
        String "${sys-card:device/../bcdDevice}"
        Match "0[12]??"
    }
    True.Define.DirectCaptureChannels 2
}

SectionUseCase."HiFi" {
    Comment "HiFi"
    File "/USB-Audio/Steinberg/UR22C-HiFi.conf"
}

Include.dhw.File "/common/direct.conf"

$ cat /sys/class/sound/card3/device/../bcdDevice
0320