From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E308DF50F for ; Fri, 31 Oct 2025 04:01:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761883309; cv=none; b=KZafF29S3aFS4O1A6NuFgPqPPdb5Ng1F+yLUDRXzKLOBq5PVYwR5ONX7ndNJlH+jcmxasgGZtBL63TrQjxqYcmVSiuRl1dnsay2xnBuObR3QE3Bo9jRGzZHrJIh4/9PZjKQfZCNAP22jVJkN8stC/b8kta3nmOWRDTnRMPeFRJU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761883309; c=relaxed/simple; bh=pB3nubgErGiwfJWOSDag8giE25KjCt3FsCkN3P3elrw=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: Content-Type:MIME-Version; b=MaLu/5MGeL0rV7A2CYmSUmWkDSgoBgnY6aOdanJPCD0myU5AJYJhs6Ojk1CavV8MC1ZjrBIqapTuzJ0To35vdik0TQy/T+C9cRQWtsU6plbnXC5QJoiRoUsWnEqJGamXYNS4zcC16/PRTCXvWazSR3/LgGp6V1oLfk9n/4oLn1A= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=axC+68zZ; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="axC+68zZ" Received: by smtp.kernel.org (Postfix) with ESMTPS id B81A3C4CEFD for ; Fri, 31 Oct 2025 04:01:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1761883308; bh=pB3nubgErGiwfJWOSDag8giE25KjCt3FsCkN3P3elrw=; h=From:To:Subject:Date:In-Reply-To:References:From; b=axC+68zZjVdjXbpeP7sX1wMWAYAwwpyL9SCdfZD7fO+ux1WEjAOInZOH4FH9qZmqS 2Ywbs9KPxigqc8ErmyQsqYOjEA3lm7zmSfjARg7VzhKPL1hq1fkUZ5CRFkVFMbM/u5 ZnkxZaSsO5z8Cl7nK2KcG+68KHqKxLX4acRiSef2LWJ7gYEBi1Ivw0SzkSdUDZgqLE rdX7iCOsUDySIhdiVSW3O3cG935heX0GmCC/u2AZA2buq6lvKFHDMpVD0ZUX5xhOCu dTOzawFfi6trgUKM0mKm2BxYlKeEwqqt+/OSADEm/xbsHo0L89AtwURBt7AebSGX5I ReXLgWBe8qBPA== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id ABE47C4160E; Fri, 31 Oct 2025 04:01:48 +0000 (UTC) From: bugzilla-daemon@kernel.org To: linux-pm@vger.kernel.org Subject: [Bug 220715] [REGRESSION] AMD P-State fails with "_CPC object is not present" on AMD Zen 4 between 6.10 and 6.11 Date: Fri, 31 Oct 2025 04:01:48 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Power Management X-Bugzilla-Component: cpufreq X-Bugzilla-Version: 2.5 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: mario.limonciello@amd.com X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: linux-pm@vger.kernel.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugzilla.kernel.org/ Auto-Submitted: auto-generated Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 https://bugzilla.kernel.org/show_bug.cgi?id=3D220715 --- Comment #2 from Mario Limonciello (AMD) (mario.limonciello@amd.com) --- Another thing that may be useful is to turn on dynamic debug statements for drivers/acpi/cppc_acpi.c at bootup on a current kernel. The syntax should be something like this on your kernel command line. dyndbg=3D'file drivers/acpi/cppc_acpi.c +p' --=20 You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.=