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 937AF134AC for ; Thu, 7 Dec 2023 05:52:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="AFPBpect" Received: by smtp.kernel.org (Postfix) with ESMTPS id 0ACEDC433CC for ; Thu, 7 Dec 2023 05:52:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1701928353; bh=cg1GUCWPQnhCx5qMC2rAQS1ni42/zAtl5FRLgJ4fJ4A=; h=From:To:Subject:Date:In-Reply-To:References:From; b=AFPBpect6OUlbVt284UJSODvTLCB0jOvjGDYdRsT5+yHpu3nOofeIdmdWlMASYjrA nem8CQONnfzamsXzJd9xCX6PT88EBxjl9dx8PcquL5CJdEok91rlB9BZn+QGd280bL crmh3vtGVkz+yUMv1/NNSvX/Asqsxwes6WQZI7fR7MDceWpXc0/7CzGjJ+5Z1b9c2h xqQMo9AQ888JmYQIWFFqvmKvTQe+nTwiaYteHLtvWkaXOjzKKRdF8JOLw3wFRndhOX rkJHFp1LgO4jqcyreZo8fkMK2hfjOExllQFf62OhdHOzJtn+niPyNA2sjDLwTBLGSp A07RHyFGH7XXQ== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id E3560C53BD3; Thu, 7 Dec 2023 05:52:32 +0000 (UTC) From: bugzilla-daemon@kernel.org To: linux-pm@vger.kernel.org Subject: [Bug 218171] amd-pstate not loading on zen2 threadripper 3960x (trx40 Date: Thu, 07 Dec 2023 05:52:32 +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: ozin@itu.edu.tr 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: cc 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=3D218171 Mithat (ozin@itu.edu.tr) changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |ozin@itu.edu.tr --- Comment #19 from Mithat (ozin@itu.edu.tr) --- Hello Everyone, I dunno if its relevant but my observations regarding the problem are: As far as I understand, AMD CPUs declares CPPC via CPUID intruction. 1) cpuid 0x80000008 (ebx) CPPC bit is always 0 (disabled) whether you enabl= e or disable CPPC in BIOS. 2) Asus AMI Bios does not have _OSC declaration for CPPC support in DSDT and SSDT tables. 3) There exists _CPC declarations in a SSDT table but since CPPC support is= not declared, it is omitted by Linux kernel ? Hence, amd_pstate module declares "the _CPC object is not present in SBIOS = or ACPI disabled" ? Hope it helps. Mithat --=20 You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.=