[Bug 264172] nvme(4): PM9A1 NVMe Samsung 512GB no longer available with 13.1-RELEASE (was working with 13.0)

In reply to: bugzilla-noreply_a_freebsd.org: "[Bug 264172] NVME ssd drive not available with 13.1-RELEASE (was working with 13.0)"
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From: <bugzilla-noreply_at_freebsd.org>
Date: Tue, 31 May 2022 14:18:24 UTC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264172

--- Comment #15 from Alexander Motin <mav@FreeBSD.org> ---
For "verbose dmesg" you should enable it during boot, either via option in
loader menu or via setting boot_verbose="YES" in loader.conf.  After that
regular `dmesg` will be much more verbose.

Looking on new `pciconf` output I see in 13.0:
        cap 05[60] = MSI supports 2 messages, vector masks
, but in 13.1:
        cap 05[60] = MSI supports 2 messages, vector masks enabled with 1
message
, that means introduced PCIe hot-plug support, just as I have guessed.  You may
try to block it with the loader tunable I've posted before.  Otherwise I am not
sure what OS should do about it, since it just handles what is reported by
hardware.

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