From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 05FC1C433FE for ; Mon, 18 Apr 2022 12:33:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239214AbiDRMgH (ORCPT ); Mon, 18 Apr 2022 08:36:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33686 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239244AbiDRMfL (ORCPT ); Mon, 18 Apr 2022 08:35:11 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8688620BDC; Mon, 18 Apr 2022 05:27:30 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id A114660FB6; Mon, 18 Apr 2022 12:27:22 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A40E2C385A1; Mon, 18 Apr 2022 12:27:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1650284842; bh=xoOqNW8QnXGo22oABOGmUCbKg4y5PZ8xL4qAa94Km+A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dIpWT/kiS0n65dfSvHSLfVej3QTKbAt1gPk5XdkSNX58pWjDOaslbKU2r6U0dzMlH yWpNiyZPrjOmDRAkq7su3dw6kWXEMFTjk4RG6RcGjk3goePAqtlD1NzoQHakGlFl5i WK+JUHwIXIJlMR695NLx/WZdYiazzJiHiRLis5Os= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Woody Suwalski , Hans de Goede , "Rafael J. Wysocki" , "Limonciello, Mario" Subject: [PATCH 5.15 008/189] ACPI: processor: idle: fix lockup regression on 32-bit ThinkPad T40 Date: Mon, 18 Apr 2022 14:10:28 +0200 Message-Id: <20220418121200.682225683@linuxfoundation.org> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20220418121200.312988959@linuxfoundation.org> References: <20220418121200.312988959@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Woody Suwalski commit bfe55a1f7fd6bfede16078bf04c6250fbca11588 upstream. Add and ACPI idle power level limit for 32-bit ThinkPad T40. There is a regression on T40 introduced by commit d6b88ce2, starting with kernel 5.16: commit d6b88ce2eb9d2698eb24451eb92c0a1649b17bb1 Author: Richard Gong Date:   Wed Sep 22 08:31:16 2021 -0500 ACPI: processor idle: Allow playing dead in C3 state The above patch is trying to enter C3 state during init, what is causing a T40 system freeze. I have not found a similar issue on any other of my 32-bit machines. The fix is to add another exception to the processor_power_dmi_table[] list. As a result the dmesg shows as expected: [2.155398] ACPI: IBM ThinkPad T40 detected - limiting to C2 max_cstate. Override with "processor.max_cstate=9" [2.155404] ACPI: processor limited to max C-state 2 The fix is trivial and affects only vintage T40 systems. Fixes: d6b88ce2eb9d ("CPI: processor idle: Allow playing dead in C3 state") Signed-off-by: Woody Suwalski Reviewed-by: Hans de Goede Cc: 5.16+ # 5.16+ [ rjw: New subject ] Signed-off-by: Rafael J. Wysocki Cc: "Limonciello, Mario" Signed-off-by: Greg Kroah-Hartman --- drivers/acpi/processor_idle.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/drivers/acpi/processor_idle.c +++ b/drivers/acpi/processor_idle.c @@ -95,6 +95,11 @@ static const struct dmi_system_id proces DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), DMI_MATCH(DMI_PRODUCT_NAME,"L8400B series Notebook PC")}, (void *)1}, + /* T40 can not handle C3 idle state */ + { set_max_cstate, "IBM ThinkPad T40", { + DMI_MATCH(DMI_SYS_VENDOR, "IBM"), + DMI_MATCH(DMI_PRODUCT_NAME, "23737CU")}, + (void *)2}, {}, };