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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 73324C433F5 for ; Sun, 31 Oct 2021 19:28:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 589C461051 for ; Sun, 31 Oct 2021 19:28:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230152AbhJaTah (ORCPT ); Sun, 31 Oct 2021 15:30:37 -0400 Received: from mail.kernel.org ([198.145.29.99]:39664 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230010AbhJaTah (ORCPT ); Sun, 31 Oct 2021 15:30:37 -0400 Received: by mail.kernel.org (Postfix) with ESMTPS id 32D0260F0F for ; Sun, 31 Oct 2021 19:28:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1635708485; bh=HW/imU8UWINDwaGunEkixoImSd5npinle7R4V1Ri1qI=; h=From:To:Subject:Date:From; b=g1zq5cDjOzg7MDAnM5g6srRMM+NeZCt0k8WhE9NgtRcxmhTd+R/ZPpqVSn7yewXjF X8qIJIpAwoyOR1scbdv6Z/inp1dH+Qyodiq9exDUavfWETBAO8VxuI3w7CmgeP9XYx 1ZbMQ6YP4sYCQz25dpPG8uGS67DpggGvHfCaeWEMXI5aQzp9U2AlYcbZdqpurEbmi7 /6VNJZn7RxqFb3BRB0n6UAIPzxA2KAvH2c8AJP6CaMZXmofh0tcyh7zDWTE+H+ZinW 7RdtPeCQiqVYREmqFLG+H7nvfR5fj/ZBYIk84nPf91wmXBatt9a138SFZa1JK7IaLK j4+iV8sXW5UeA== From: bugzilla-daemon@bugzilla.kernel.org To: platform-driver-x86@vger.kernel.org Subject: [Bug 214899] New: ideapad-laptop: platform backlight device not working Date: Sun, 31 Oct 2021 19:28:04 +0000 X-Bugzilla-Reason: None X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: AssignedTo drivers_platform_x86@kernel-bugs.osdl.org X-Bugzilla-Product: Drivers X-Bugzilla-Component: Platform_x86 X-Bugzilla-Version: 2.5 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: johannes.penssel@gmail.com X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P1 X-Bugzilla-Assigned-To: drivers_platform_x86@kernel-bugs.osdl.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version cf_kernel_version rep_platform op_sys cf_tree bug_status bug_severity priority component assigned_to reporter cf_regression attachments.created Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugzilla.kernel.org/ Auto-Submitted: auto-generated MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: platform-driver-x86@vger.kernel.org https://bugzilla.kernel.org/show_bug.cgi?id=3D214899 Bug ID: 214899 Summary: ideapad-laptop: platform backlight device not working Product: Drivers Version: 2.5 Kernel Version: 5.10.27-5.14.15 Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: Platform_x86 Assignee: drivers_platform_x86@kernel-bugs.osdl.org Reporter: johannes.penssel@gmail.com Regression: No Created attachment 299379 --> https://bugzilla.kernel.org/attachment.cgi?id=3D299379&action=3Dedit DSDT.dsl Hardware: Lenovo IdeaPad 5 15ITL05, latest BIOS version Issue: Platform backlight device provided by ideapad-laptop has no effect on actual brightness. Pressing brightness keys on my keyboard causes changes in /sys/class/backlight/ideapad/actual_brightness, but no uevent is generated = (as outlined in drivers/video/backlight.c source code comments), and /sys/class/backlight/ideapad/brightness is unaffected.=20 When manipulating /sys/class/backlight/ideapad/brightness directly, uevents= are being generated, but no change in real screen brightness occurs.=20 The only way that screen brightness can actually be changed is by using i91= 5's intel_backlight sysfs interface, which does not respond to brightness keybo= ard keys. attached is my decompiled DSDT and dmesg. ls -la /sys/class/backlight/ideapad/ total 0 drwxr-xr-x 3 root root 0 Oct 31 19:40 . drwxr-xr-x 3 root root 0 Oct 31 19:40 .. -r--r--r-- 1 root root 4096 Oct 31 19:40 actual_brightness -rw-r--r-- 1 root root 4096 Oct 31 19:40 bl_power -rw-rw-r-- 1 root video 4096 Oct 31 19:43 brightness lrwxrwxrwx 1 root root 0 Oct 31 19:40 device -> ../../../VPC2004:00 -r--r--r-- 1 root root 4096 Oct 31 19:40 max_brightness drwxr-xr-x 2 root root 0 Oct 31 19:40 power -r--r--r-- 1 root root 4096 Oct 31 19:40 scale lrwxrwxrwx 1 root root 0 Oct 31 19:40 subsystem -> ../../../../../../../class/backlight -r--r--r-- 1 root root 4096 Oct 31 19:40 type -rw-r--r-- 1 root root 4096 Oct 31 19:40 uevent --=20 You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.=