[Bug 296325] OSS: RODECaster 2 returns ENOSPC when opened with bitperfect=0

From: <bugzilla-noreply_at_freebsd.org>
Date: Sat, 27 Jun 2026 16:42:42 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=296325

            Bug ID: 296325
           Summary: OSS: RODECaster 2 returns ENOSPC when opened with
                    bitperfect=0
           Product: Base System
           Version: 15.1-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: me@kuon.ch

I have a RODECaster 2 which I want to use with OSS.

It works with `sysctl dev.pcm.n.bitperfect=1` (with the bitperfect caveats) I
can then use pulseaudio or jack with it, but if I set bitperfect to 0, then
`open("/dev/dspN", O_WRONLY);`  returns ENOSPC.

fuser shows no other process using the device

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