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 D3111257844 for ; Sun, 12 Apr 2026 09:05:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775984732; cv=none; b=dunk2LWZkdsi/9HQVuZe4hIzjDxD7KIdGqrCf+SrIuthuyWqeRyube3KtfWea47nGqsDLPwqOHsCmelG5NPZiKUm5cv2PW6MYMQUZQxW7ELQSkHyALd1F7y4Vl8DKc16iZMnnhVU0EkHDYqAUOA+IHW30XdcLfLisDQAj1gzsec= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775984732; c=relaxed/simple; bh=M5AFdESz+ehu46jlR0u44s+7eqynE4DDNCg4s7mfw+g=; h=From:To:Subject:Date:Message-ID:Content-Type:MIME-Version; b=FebAM+hbNY1REIsBLeoAsNk5McY66xosS1nnyF3+uo+S4k2abgwb0fFHAKVWMcLCZEz1/pgf+WVzmoQITqAqFgVfSxrFrKHHP97g8TKW8qlhwCFJhgg7MEjluf1FeFdzUmJ0SqWj8GPAgrXuFPmK3cXxpY238C2XhjUMoDSSkDE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=YTmPkRmb; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="YTmPkRmb" Received: by smtp.kernel.org (Postfix) with ESMTPS id 6F3D7C19424 for ; Sun, 12 Apr 2026 09:05:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1775984732; bh=M5AFdESz+ehu46jlR0u44s+7eqynE4DDNCg4s7mfw+g=; h=From:To:Subject:Date:From; b=YTmPkRmbcTzhDdh0lnVCB2t4JPJZk5S+h0ZomoLPZhDcGAgaoaUJL95P4oidyuWSb xNQTark2GqC4mZ73DWLfoKYEOqglEfoMfrUnN6bgmCbGeGXD626xC9NjJ9yASFdbmk A6zlX7kEeD093xQFaV2nYW9BH7Jk176GzOSh5JK527WJ3mi3bq96E6wspWQ5ZHm1+A aBJJisXFCmyTA1e6o7+gRTvwBJfuJFcFpB0rscI2rjA8mOcmzL6Zh5aexhd/chys+y Odp0xzJ3a3aJOj+1IF/XduM9BPjjOWKY2+7WElfSuZdh9E6LRHXPVqUq3IoTib0jRx 2qEWPW+NoZUTA== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id 674DDC433E1; Sun, 12 Apr 2026 09:05:32 +0000 (UTC) From: bugzilla-daemon@kernel.org To: platform-driver-x86@vger.kernel.org Subject: [Bug 221353] New: ideapad_acpi: fan_mode values 1/2/4 all trigger dust cleaning mode Date: Sun, 12 Apr 2026 09:05:32 +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: basak.sb2006@gmail.com X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: drivers_platform_x86@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 Precedence: bulk X-Mailing-List: platform-driver-x86@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 https://bugzilla.kernel.org/show_bug.cgi?id=3D221353 Bug ID: 221353 Summary: ideapad_acpi: fan_mode values 1/2/4 all trigger dust cleaning mode Product: Drivers Version: 2.5 Hardware: Intel OS: Linux Status: NEW Severity: normal Priority: P3 Component: Platform_x86 Assignee: drivers_platform_x86@kernel-bugs.osdl.org Reporter: basak.sb2006@gmail.com Regression: No # Hardware ## DMI - system-manufacturer: `LENOVO` - system-version: `IdeaPad 3 15ALC6 Ub` - system-product-name: `82KU` - bios-version: `GLCN46WW` ## Kernel - `uname -a`: `Linux ideapad 6.19.11-arch1-1 #1 SMP PREEMPT_DYNAMIC Thu, 02= Apr 2026 23:33:01 +0000 x86_64 GNU/Linux` # Description According to [Documentation/ABI/testing/sysfs-platform-ideapad-laptop](https://github.co= m/torvalds/linux/blob/f5459048c38a00fc583658d6dcd0f894aff6df8f/Documentatio= n/ABI/testing/sysfs-platform-ideapad-laptop), fan_mode supports: 0 =3D Super Silent 1 =3D Standard 2 =3D Dust Cleaning 4 =3D Efficient Thermal Dissipation However, on this device: - Writing 1, 2, or 4 all produce identical behavior. - Fan enters a pulsing high-speed mode where it ramps up to max speed and t= hen ramps down to 0 RPM about 10 times. Consistent with "dust cleaning" mode. - Only value 0 behaves differently. It changes it to the default/"Super Sil= ent" mode. Here is the observation table: | Input | Transition (read immediately afterwards) | Finish (r= ead after 1 min or so)| |-------|-------------------------------------------------------|----------= ----------------------| | 0 | immediately 133, minimal fan activity | 133=20=20= =20=20=20=20=20=20=20=20 | | 1 | 3, enters "dust cleaning" mode | 5=20=20= =20=20=20=20=20=20=20=20=20=20 | | 2 | 3 | 5=20=20= =20=20=20=20=20=20=20=20=20=20 | | 4 | 3 | 5=20=20= =20=20=20=20=20=20=20=20=20=20 | # Steps to Reproduce 1. Switch to a fan mode. - echo 0 | sudo tee /sys/bus/platform/drivers/ideapad_acpi/VPC2004:00/fan_= mode - echo 1 | sudo tee /sys/bus/platform/drivers/ideapad_acpi/VPC2004:00/fan_= mode - echo 2 | sudo tee /sys/bus/platform/drivers/ideapad_acpi/VPC2004:00/fan_= mode - echo 4 | sudo tee /sys/bus/platform/drivers/ideapad_acpi/VPC2004:00/fan_= mode 2. Observe that all of them except mode "0" (a.k.a. "Super Silent" mode) ma= ke the fan enter the "dust cleaning" mode. # Expected Different fan behaviors per documented modes. # Actual All non-zero modes behave like dust cleaning. Best Regards, Sourajyoti Basak --=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.=