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 746792E8B75 for ; Wed, 7 Jan 2026 10:14:34 +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=1767780874; cv=none; b=iXfIfJbPQ8YrVjS7Bmpnaj+G+hYV8rzTAEFW26FDtF6ibEj62gfnjGl7FqsU3tN83HR3xBs7zOvA/arCUZWqxPIF/4F0XqPnd4jMKoD9AglXKtnt8y/KxkewZcdM6VYNCuon8wUEYL5jIPMUDtRS4gcCRMz11lzFteiG1t4uWAU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767780874; c=relaxed/simple; bh=X0SbD+jGDnDmdAfVbyL54612ctjbhoNjF7WZhCDYMZk=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=sSV5E+nSAhH832RS5O0acCEz7tJ1EXXE0ziG1Nz4Jsoaews37WzmhODle+MeSA6cBb0Li316loht/xLbm+hxToBFssAGhisNUDMmlONvkTVySUzq+ttIxFavcjqOc4nyys5aF/eX0S98W7C306iI9BGYQVbyKgl/GWZNOD1xRx4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ZfmgptDR; 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="ZfmgptDR" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DAC63C4CEF7; Wed, 7 Jan 2026 10:14:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1767780874; bh=X0SbD+jGDnDmdAfVbyL54612ctjbhoNjF7WZhCDYMZk=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=ZfmgptDRT0MMwUUeLX1cjAWTfca6fXVt1mI+tyYDnYzMSX0IM+Zere0xCRLkmUkmj 8S2FTK17cvRlaq7rbHsi+Eq6K2bMziw3Y118DwELwiUU0+GTgQ+mCuXTTt7WEDEkuK PlokdIj2/0pO5du/1EQZ+W3MAPNEuwVp0UYE6CQ/SdOIdiEsS/GzM2NAifNuCcjtcF mlBkMghoy6lPFG50ShELN7HW29FUgqwU+zlcqvKyumFithqXZGh1IVaSjNDQ6EfTZm Onsv2o9ZkJ8jy6qhQseVKAMQ2v9FjjlczlJ4bATm0ZDNBDz3TVIFApTDnbQDQtQe/3 IoLpFp0ZdQreQ== Date: Wed, 7 Jan 2026 11:14:29 +0100 From: Niklas Cassel To: wolf@yoxt.cc Cc: linux-ide@vger.kernel.org, dlemoal@kernel.org, tj@kernel.org Subject: Re: [REGRESSION] libata: SATA LPM forcibly disabled on Intel Raptor Lake since Linux 6.14. Message-ID: References: <605b34a7723436284699c9a8e524907b@yoxt.cc> Precedence: bulk X-Mailing-List: linux-ide@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <605b34a7723436284699c9a8e524907b@yoxt.cc> On Tue, Jan 06, 2026 at 08:57:07PM +0100, wolf@yoxt.cc wrote: > Hello, > > I am reporting a power-management regression in libata affecting the Intel > Raptor Lake SATA AHCI Controller, introduced after Linux 6.14. (snip) > and 4 apparent dummy ports might be unexpected? > > Manually setting LPM on the affected hosts fails with: > echo med_power_with_dipm > > /sys/class/scsi_host/host*/link_power_management_policy > -bash: echo: write error: Operation not supported This is most likely because your ports are marked as External / Hotplug capable by BIOS. LPM and Hotplug are mutually exlusive in SATA. So in order allow your ports to detect a hotplug event, LPM cannot be disabled. Things you can do: -Go into your BIOS settings and disable the hot-plugging capability for the ports. -If you don't have such a setting, you can use the mask_port_ext AHCI module parameter. Simply add: ahci.mask_port_ext= to your kernel command line For more info, see this thread: https://lore.kernel.org/linux-ide/5a74106a-d9db-4e63-b3e6-3857f30a1190@interia.pl/T/ Kind regards, Niklas