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 07A0E17A2F0 for ; Fri, 31 Oct 2025 03:55:57 +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=1761882958; cv=none; b=HPQZvnk122RuzTZQhrMsHiQCjBXWprVCV/ZuLg5ne1ytFFJ+yWakz1HMG5grm8fr/3pEv80DDeuV9pVsRyFdtfJMaMwMp4Y5+zgLhCb41jin7lVH0KQIJzHdRdJHmY4nPb8mZwNF7HULWwPsYfdGkNi3orcl+Ng81YJwFQRfEwo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761882958; c=relaxed/simple; bh=aJY5YxHjrrs+bL/E4GDrICcV7CqSPu8ZnLFwgLCxZrM=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: Content-Type:MIME-Version; b=VDU+KUs5MAc5/PmJtQiNqyqSgmR9jzCtyewpxz8Ef4mPU7Fxjbdrr8xIWjaiXSScb5vTRGTGRT/Re8OaKgqVBVo/6AHynqt1bn2hZ9YVJfLsH9fuHPCZg0o5I83n/yXU8D+g+p4+WBYboUBD2E2EFSKcuQxGHcDqG0cOVfVRMkY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=K2iW+lV1; 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="K2iW+lV1" Received: by smtp.kernel.org (Postfix) with ESMTPS id 87AEFC4CEFB for ; Fri, 31 Oct 2025 03:55:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1761882957; bh=aJY5YxHjrrs+bL/E4GDrICcV7CqSPu8ZnLFwgLCxZrM=; h=From:To:Subject:Date:In-Reply-To:References:From; b=K2iW+lV1acvo7TV2cnxbgDt/suG1fDr0AqLh6+lH1h5yKQ8exUwRp8RxPjpI1oQR9 d1OcrSF8Qdk91QzmgX+zlzVHnj/QdzK0/e9fK0uIkinRWDKTIrtmWC8p8mS5n6SwWf yoa2VGS55olSEZ31eJdSPebqx/gF2elHHtnY298BanQCNALL1GtCuUIllaK8b8ikiG mRuRiAcyCISgBECKC9ovmANgJK/RjgG3K/qwqB/w8sUVqvufdrH+GnFcchXmtTBCoF etKdrIrMKEk0Arwi0DCka9QGwxJgvwG8gs/NrfY1fSTAAOb0DbQPRsJ26YhqrGPuVO BG+/gXwb+oLOg== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id 74E6EC4160E; Fri, 31 Oct 2025 03:55:57 +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 03:55:57 +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 #1 from Mario Limonciello (AMD) (mario.limonciello@amd.com) --- So I do see _CPC entries in your acpi table dump, but I initially had a hard time decoding it on a machine with a newer acpica-tools package. I tried on a machine with older acpica tools and could decode it though. This has me wondering if the bug is perhaps not in amd-pstate but rather in acpica code (the kernel has an acpica based interpreter as well). Can you please check out the kernel source and do a bisect of actual kernel commits instead of the binary kernels from the Ubuntu mainline PPA? This w= ill get us narrowed down to exactly what the root cause is. --=20 You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.=