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Wed, 10 Jun 2026 18:32:51 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: acpi@FreeBSD.org Subject: [Bug 295941] Minisforum MS01 instability after 7b26353a59d6 hwpstate_intel: Disable package control on hybrid CPU Date: Wed, 10 Jun 2026 18:32:51 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 16.0-CURRENT X-Bugzilla-Keywords: regression X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: gallatin@FreeBSD.org X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: acpi@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="UTF-8" X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated List-Id: ACPI and power management development List-Archive: https://lists.freebsd.org/archives/freebsd-acpi List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-acpi@FreeBSD.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D295941 --- Comment #7 from Andrew Gallatin --- (In reply to Adrian Chadd from comment #6) In all honesty, claude told me about it as I was bouncing ideas off of it. = It seems like its not documented (checked volume 4 of the Intel SDM, where oth= er MSRs are found), but is used in several projects. If you do a web search f= or=20 for "PL4" or "icc_max" or intel msr 601h, you'll find about as much as I fo= und out from claude. This knob is typically set by BIOS and sometimes tweaked by overclockers, a= nd i suspect its not documented because setting it wrong can lead to instability= .=20=20 Eg, for *my* case, I'm not sure there is a lot to do here. I mostly opened this bug because you asked for it. --=20 You are receiving this mail because: You are the assignee for the bug.=