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 08171C61DB3 for ; Thu, 12 Jan 2023 14:23:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236603AbjALOXs (ORCPT ); Thu, 12 Jan 2023 09:23:48 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44266 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236366AbjALOXQ (ORCPT ); Thu, 12 Jan 2023 09:23:16 -0500 Received: from wp530.webpack.hosteurope.de (wp530.webpack.hosteurope.de [80.237.130.52]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2B9CC5A881 for ; Thu, 12 Jan 2023 06:14:47 -0800 (PST) Received: from [2a02:8108:963f:de38:eca4:7d19:f9a2:22c5]; authenticated by wp530.webpack.hosteurope.de running ExIM with esmtpsa (TLS1.3:ECDHE_RSA_AES_128_GCM_SHA256:128) id 1pFyLt-0008E1-HX; Thu, 12 Jan 2023 15:14:45 +0100 Message-ID: <57e2f165-4d4a-d8bc-47c0-1b0609cd2147@leemhuis.info> Date: Thu, 12 Jan 2023 15:14:45 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.6.0 Content-Language: en-US, de-DE From: "Linux kernel regression tracking (Thorsten Leemhuis)" To: Hans de Goede Reply-To: Linux regressions mailing list Cc: walter59 , Adrien , LKML , "regressions@lists.linux.dev" Subject: =?UTF-8?Q?=5bregression=5d_Bug=c2=a0216904_-_backlight_brighness_co?= =?UTF-8?Q?ntrol_with_video_missing_/sys/class/backlight_interface?= Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-bounce-key: webpack.hosteurope.de;regressions@leemhuis.info;1673532887;2bdc721c; X-HE-SMSGID: 1pFyLt-0008E1-HX Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, this is your Linux kernel regression tracker. I noticed a regression report in bugzilla.kernel.org. As many (most?) kernel developer don't keep an eye on it, I decided to forward it by mail. Quoting from https://bugzilla.kernel.org/show_bug.cgi?id=216904 : > walter59 2023-01-09 11:31:18 UTC > > backlight brighness control with video missing /sys/class/backlight interface > > kernel 6.1 it is ok --- kernel 6.2 not > > [reply] [−] Comment 1 The Linux kernel's regression tracker (Thorsten Leemhuis) 2023-01-10 06:24:45 UTC > > What kind of machine is this? Could you please attach the output of `lspci -nn` and `dmidecode` > > [reply] [−] Comment 2 Adrien 2023-01-11 21:47:24 UTC > > Hi, > > Same here. Everything is fine on 6.1.3 and the issue seems to happen starting 6.1.4. > `ls /sys/class/backlight/` returns nothing. > I can't adjust the brightness with Fn+F3/F4 (dmesg returns acer_wmi: Unknown function number - 4 - 0). > I'll try to do a bisect. > See the ticket for more details. [TLDR for the rest of this mail: I'm adding this report to the list of tracked Linux kernel regressions; the text you find below is based on a few templates paragraphs you might have encountered already in similar form.] BTW, let me use this mail to also add the report to the list of tracked regressions to ensure it's doesn't fall through the cracks: #regzbot introduced: v6.1..v6.2-rc4 https://bugzilla.kernel.org/show_bug.cgi?id=216904 #regzbot title: brightness: /sys/class/backlight interface is missing (in 6.1.3->6.1.4, too?) #regzbot ignore-activity This isn't a regression? This issue or a fix for it are already discussed somewhere else? It was fixed already? You want to clarify when the regression started to happen? Or point out I got the title or something else totally wrong? Then just reply and tell me -- ideally while also telling regzbot about it, as explained by the page listed in the footer of this mail. Developers: When fixing the issue, remember to add 'Link:' tags pointing to the report (e.g. the buzgzilla ticket and maybe this mail as well, if this thread sees some discussion). See page linked in footer for details. Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat) -- Everything you wanna know about Linux kernel regression tracking: https://linux-regtracking.leemhuis.info/about/#tldr If I did something stupid, please tell me, as explained on that page.