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 5A6BD19D07E for ; Tue, 4 Nov 2025 21:06:41 +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=1762290401; cv=none; b=q/ToNUlKeutLQH8FHQsVNCoxyxY1SaeP/y5BG6vylD2Yh0jYlzbr13n36GAh/r05arvNTMzYvF1+zMliFAg3n5enGvRBo3KyUP3bhIbIeb4SYxsgoDVEL3yLI8iZlXQ8bYp+yJaSl1w2VrfOC8JsKUGGNqpd4IOkAmBdNR0rBRI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762290401; c=relaxed/simple; bh=c23t9mXD6gO0+CuXt3jjJrM+4G3R/CC6pOl7pU0JeUU=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: Content-Type:MIME-Version; b=ZDeLg10XNGn0W6JkUVGpKSnKtn3m/TWq4ht3Ourdo2B+yxMojb+n3H1le+5X9tTuyZAZQhcJbmq8U/wO8zrU8PeNmkPQF+/VTX9jYr/J1Oh88WC3gLF9BmdPfDHZFoJfvO4gdzwaAUBSAynxV2r7zg7sHNL9T+HEJnw8euyKLkg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=kGH8DB/A; 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="kGH8DB/A" Received: by smtp.kernel.org (Postfix) with ESMTPS id 37591C4CEF7 for ; Tue, 4 Nov 2025 21:06:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1762290401; bh=c23t9mXD6gO0+CuXt3jjJrM+4G3R/CC6pOl7pU0JeUU=; h=From:To:Subject:Date:In-Reply-To:References:From; b=kGH8DB/AA6uiZJRuuF//h301M4wobHfHdK0KoLmubU2BWXWjRdp+X7mDvpBtm8HZL Mkuk0pj/PjSv4yUMDTJO8JaXG1gWK2vC/p+1++WUwBbkpy9ZuLR5Qrl1C0iIZi4RH8 bYe7VUTQppiVCJVd/uwcIINhFh+NBxqD/LIZI1HEaWVnCXOOC1txUIuKsIvij17wXu Q1icwyc60KWyfYjEo3y66pH1Z4UadIs4enqu8dNnpvRD7rzZ02ccN6Avm1M7Kjn+1r UO/HifO9E3DjXhwMvhibxiXgRztwYRRFxo1auYKw1h3rMPDBAP5cGRwtB/70D6UIMK +JcgCxHTML1aw== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id 2E6A0C53BC7; Tue, 4 Nov 2025 21:06:41 +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: Tue, 04 Nov 2025 21:06:40 +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 #20 from Chris Harris (chris.harris79@gmail.com) --- SUCCESS on kernel v6.17 with Gautham's patch combined with Mario's most rec= ent patch: 1. arch/x86/kernel/acpi/cppc.c (amd_detect_prefcore): for_each_present_cpu =E2=86=92 for_each_online_cpu 2. drivers/acpi/cppc_acpi.c (acpi_cpc_valid): for_each_present_cpu =E2=86=92 for_each_online_cpu - Driver: amd-pstate (working correctly) - Message: "AMD CPPC MSR based functionality is supported" - nosmt=3Dforce active, SMT disabled (1 thread/core) Full dmesg attached: dmesg-6.17-SUCCESS-online-cpu.txt I imagine this fix will be included in the kernel in the future (that would= be very nice). Please let me know if you'd like anything further from my side= .=20=20 Thanks again for all your efforts! --=20 You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.=