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 3D191E555 for ; Sun, 2 Nov 2025 14:53:56 +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=1762095237; cv=none; b=sxRCqB7QLSgGhkIYryInNViHV80KfQnWPSqh17e1Tnbg4BDyaDy522V0xk3lgLl9cLDTsdPzK88gcsQTV5X3rzzJJ8nk9b18CUVmQFo1kx6yGe7yHnYgY+76xTTFzCpYhkbYKReD8h/VmJWr310vYfgFP9hgE0zRAgsfAQZ5jRA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762095237; c=relaxed/simple; bh=BrVzzLd9SkCDa8z+dtFP1J16e1Wf88nr2ARQWxfi6Mc=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: Content-Type:MIME-Version; b=HbyDb90fWRttd3h28smzTu7d+bNWlOPBXp79cOYrfwnlzfqzQ6k2dLobM+Q9q4k2luFcbBry6tJiUR+fAs7LTTaPrC0hB8H6gNaut2FtIO9tLwcGgl0TnCSxGjGkaxs4AZlMd4GozFoRD/xFlz/ippcJm6URW2XQtTCYAr4QN9k= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=kP453L6s; 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="kP453L6s" Received: by smtp.kernel.org (Postfix) with ESMTPS id B5E05C4CEF7 for ; Sun, 2 Nov 2025 14:53:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1762095236; bh=BrVzzLd9SkCDa8z+dtFP1J16e1Wf88nr2ARQWxfi6Mc=; h=From:To:Subject:Date:In-Reply-To:References:From; b=kP453L6sBasJP15zHilaVnJcRKa2g0ihEtOI7H3t9jv9J22s0idbPNNBbk87A18g6 gvNFCjhnCbBnuwMYGAHG0Dwelf45daLca1aWFOYjI0x1j6e9V3q7cJ+IHLaJ8HVboy WAivRFyBx/UeSvk3M5ZxSCayVfscYv8aKElbD+hDPQF8qxlZu4BpP5/TEh2JFrUp8H +V9FK3yyGD4WrlZ7rH8GB9sMsC3GlQtE2ejtYV35u8U1mzZQVfLiURg3GJZ4pCJwzn 9jHEibhB2B3ev763n+xo6neH0gkSU1tXl1bbLH/0o3UTfzFHkzmpng7XySlQ0+YHz+ pfZFAYU3Fdliw== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id AD00BC433E1; Sun, 2 Nov 2025 14:53:56 +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: Sun, 02 Nov 2025 14:53:56 +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: chris.harris79@gmail.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 #9 from Chris Harris (chris.harris79@gmail.com) --- 3 follow-up) The patch does not fix the issue. - Applied patch to v6.11 source, verified with grep, built and installed - Booted with amd_pstate=3Dpassive + nosmt=3Dforce - Confirmed nosmt in effect: lscpu shows 'Thread(s) per core =3D 1' - Result: Driver still falls back to acpi-cpufreq - Error: "amd_pstate: the _CPC object is not present in SBIOS or ACPI disab= led" --=20 You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.=