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Date:      Thu, 14 Feb 2019 17:26:38 +0000
From:      bugzilla-noreply@freebsd.org
To:        acpi@FreeBSD.org
Subject:   [Bug 231760] FreeBSD 12.0-ALPHA7 Installations Halts at ACPI on 4 different AMD Ryzen Laptops (HP, DELL, Huawei)
Message-ID:  <bug-231760-16045-vj4cP568fJ@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-231760-16045@https.bugs.freebsd.org/bugzilla/>
References:  <bug-231760-16045@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D231760

--- Comment #9 from John Baldwin <jhb@FreeBSD.org> ---
That is really weird to be reading 1 byte of 0x24-0x27.  0x24 is a BAR and
nothing should be reading individual bytes of that.  Can you get a stack tr=
ace
for a read of register 0x24 with size 1 (kdb_backtrace() should print out a
stack trace)?

Given that that is right after ACPI registers its interrupt, I wonder if it=
's
something weird in the DSDT itself doing the register accesses?  Providing =
the
acpidump might be useful as well if the stack trace ends up in ACPI.

--=20
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