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 1BCB01990A7 for ; Sun, 2 Nov 2025 05:22:52 +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=1762060973; cv=none; b=XX2w0AOzy0bis4mztVSi/8xgTMher6KYS2eGm0vUQj4KsxL648KX9bVsF9oSXhxwjbDaBNcwXLDzdZeGPrWXGZO0pERheOTz6mQDUQBgyl43o5rAqkrtQyzKsqe/hJ69+I5ddSFrn4+Mm7gjtlsmXuynwina8O2fN8Ox8htDCLw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762060973; c=relaxed/simple; bh=Sn7F0JvalcYBNX64dTtsoRYFvDKJejKfDVw1Fyl2JmY=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: Content-Type:MIME-Version; b=eeWZzPLjEfc4TFkMAjCRXbpqHjoIObwdDMVMevx1sTTY1NmZyPM5MkUG7dPGpODwEy/l3aIJFc6gtz7XC4+vRaABtsCAqSWQ6TymVkdk6h3q0uR8Q63RD+EwS6LtAH14dixnXTbVZZMMIFpTfnuQ48d1xITmxp17fEC+cEVKmT8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=b75PrH3I; 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="b75PrH3I" Received: by smtp.kernel.org (Postfix) with ESMTPS id 90ED1C4CEF7 for ; Sun, 2 Nov 2025 05:22:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1762060972; bh=Sn7F0JvalcYBNX64dTtsoRYFvDKJejKfDVw1Fyl2JmY=; h=From:To:Subject:Date:In-Reply-To:References:From; b=b75PrH3Ic/1lrarL0wlOY+T474AsauIgDScybmc2RQAVorwNVX1ItIylrEGuXzwcq F3R9qlFuYGH7xL2R3F9so9G83pvFG64TtocWkR1AtpAqe+61BRyOAnshto18G1vf/m 38r53/Hj1pJOW6WaPVUZ9UZrDGZpjqR35WGHS4PzO72v+aj1qxMSHYQphA6VnrE+GP 9tfMI67JFJzmWIH2TWn+d3ydEYd0acxUCXZxX0ED3zPAJDYogx2Cl35YRihL8Z7Bdk F7JhWIvlHfE2rwoZRKcXLK1BWbhSGIZXxV417dEgwwPJ+ZYFpMVjvMkBwGG3iUjUoa 8pRVd8jFOGrFQ== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id 8415BC41616; Sun, 2 Nov 2025 05:22:52 +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 05:22:52 +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 #6 from Mario Limonciello (AMD) (mario.limonciello@amd.com) --- Thanks for sharing that. A few more follow up questions. 1) I noticed looking at your kernel command line that you have `nosmt=3Dfor= ce`.=20 Does removing that help this issue? 2) I notice that the LLM that you are copy/pasting from to interact with me claims that Ryzen 7950X is also affected. Is that a hallucination? I didn= 't see that in your logs at all. I have plenty of Zen4 hardware that has never encountered this behavior. --=20 You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.=