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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A3C01C83F0A for ; Tue, 8 Jul 2025 16:35:09 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 0F56210E028; Tue, 8 Jul 2025 16:35:09 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.b="WT70nnZL"; dkim-atps=neutral Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by gabe.freedesktop.org (Postfix) with ESMTPS id 7DC7810E028 for ; Tue, 8 Jul 2025 16:35:08 +0000 (UTC) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 68B7C6112D for ; Tue, 8 Jul 2025 16:35:07 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPS id 1F9B8C4CEED for ; Tue, 8 Jul 2025 16:35:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1751992507; bh=MCMU/vicIYjI7hhx0VfPQQsK6mfoAqeUzVxxUmhEUjU=; h=From:To:Subject:Date:From; b=WT70nnZLpUeHl+lLJHaet7T3FCQ+Ferx37XXXOOj6IE+OgY/mhSVaoZD3Tia/YrUP lDtOj4VbgJd4NiXfWmLYSuantHEZmp6xsMIBWiJM/Pygq1elFKVhH55hguxsyMUjFD MGoWzLZXLtoTgyRjyCDkKJF3RukcqGQheI1oXrPB1wuNeGFAVQOqyyaNq5zJui9X3t KoGUizxTZuRjmYxf5X6SkC/8YCWAfNqHDeR0ehGcOMOuO5BctNW0Zs7CuTo0PUGRsY Tw8Gc6ZX0Wb3qCrpvYGAkA7m281aTeUlfMr1XdtQU/1mPdSbLmpLtiJujFgLCyEM9O wKF/Umz7pexnA== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id 11465C3279F; Tue, 8 Jul 2025 16:35:07 +0000 (UTC) From: bugzilla-daemon@kernel.org To: dri-devel@lists.freedesktop.org Subject: [Bug 220326] New: Mismatch between the meanings of brightness and actual_brightness Date: Tue, 08 Jul 2025 16:35:06 +0000 X-Bugzilla-Reason: None X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: AssignedTo drivers_video-dri@kernel-bugs.osdl.org X-Bugzilla-Product: Drivers X-Bugzilla-Component: Video(DRI - non Intel) X-Bugzilla-Version: 2.5 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: kernvirt@gmail.com X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: drivers_video-dri@kernel-bugs.osdl.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter cf_regression 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 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" https://bugzilla.kernel.org/show_bug.cgi?id=3D220326 Bug ID: 220326 Summary: Mismatch between the meanings of brightness and actual_brightness Product: Drivers Version: 2.5 Hardware: AMD OS: Linux Status: NEW Severity: normal Priority: P3 Component: Video(DRI - non Intel) Assignee: drivers_video-dri@kernel-bugs.osdl.org Reporter: kernvirt@gmail.com Regression: No Amd ryzen 5 7520u (Mendocino) /sys/class/backlight/amdgpu_bl1/type =3D raw max_brightness =3D 255 Bug: The meaning of brightness does not match the meaning of actual_brightn= ess in /sys/class/backlight/amdgpu_bl1. For example, I set brightness 160 and actual_brightness at this moment =3D 100, Also for example 80/25. In other = words, the higher the brightness level I set, the larger the adjustment step per brightness percentage becomes of actual_brightness, for example 0-4% bright= ness in kde =3D 0 in actual_brightness, While the difference between 40 and 45% = is already 11 units in actual_brightness.=20 Tested kernels:6.13-6.15.5 Distro - debian/fedora/arch I've tried: -kernel parameters: acpi_backlight=3Dvideo/vendor/native amdgpu.backlight=3D0 -brightnessctl, acpilight=20 -tty, DE Everywhere the result is the same as I described above. --=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.=