From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.17]) (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 9D92D36E46C; Mon, 12 Jan 2026 16:53:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.17 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768236781; cv=none; b=rfB26lI2hDFSZK4qhayxM5tSVCK0nzancIvnrPE8WZGJSEAUybA/1TR6oKzBVy8gVqv3aMgCts4bkQYYT/e/MoX/stjqw3aWsdrwIUHzhNPOkESM/7JcEQaWwv8/d6nimZ/thYoO+aoDAIGwbghnOvAf1xJuPlaJ4iK4R1kjvns= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768236781; c=relaxed/simple; bh=laV8xz/6V9G3zKvzYctIE/Zg4SHdexkGs0xwcwO8fzM=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=N4D0XpGDl9tP6VfY5L7ZXyBZymb4m86VGgN23ZbzRbO71Y7V2IAgJrp99fVBs//S6T5UOBt8ueIJ+N2q19ljAQH6xasqrImq1qu8n6pwEpZH32SQn3gr4p8YWKbhQnVMPf03vgi43NwXstdO+d89ivWDbV5/XfDjaWJ+im9Laog= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=pass smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=aolkf+cT; arc=none smtp.client-ip=198.175.65.17 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="aolkf+cT" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1768236780; x=1799772780; h=date:from:to:cc:subject:message-id:references: mime-version:content-transfer-encoding:in-reply-to; bh=laV8xz/6V9G3zKvzYctIE/Zg4SHdexkGs0xwcwO8fzM=; b=aolkf+cT6beSadffBBwt7cwokN52UurUF9lmUfAZFU8UIcXpcKvvY35Y 45rT4Xq38Fym0D468XNITHzSYxOh/k+f/n04euuDUlFHsOe9unlfj0Aps fwRPGFaQIX8wULae+zeyQQwawX4k4r81ZF0pZqTqGQy1pQO0XSq8WkFoV hnB6H/HsCb98UZ7N2Hq/FXNzmdkAeeVoQNS86MhpUnv3MywdqAhkiDGwZ 4zBmS6D2u6WhEFarAoxaTNbP1sicl76c+haCqyg+a51+fUpLbIn/kOXHL Hx5rLl8E3JbEGO7GCicS6jP7lKQqoKayWgv/HbRKkHjuZemV8mq9wMdbC w==; X-CSE-ConnectionGUID: JkaWjF46Rcyg0EYbw91BTw== X-CSE-MsgGUID: q6E2KvS1TgCtsZmu3MoTwA== X-IronPort-AV: E=McAfee;i="6800,10657,11669"; a="69499557" X-IronPort-AV: E=Sophos;i="6.21,221,1763452800"; d="scan'208";a="69499557" Received: from orviesa003.jf.intel.com ([10.64.159.143]) by orvoesa109.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Jan 2026 08:53:00 -0800 X-CSE-ConnectionGUID: 6yMCn+3DSnGtPVZ4MqnqCg== X-CSE-MsgGUID: pFAlkfMLR3C3UGbxBjlfMQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.21,221,1763452800"; d="scan'208";a="208288084" Received: from dhhellew-desk2.ger.corp.intel.com (HELO localhost) ([10.245.245.37]) by ORVIESA003-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Jan 2026 08:52:58 -0800 Date: Mon, 12 Jan 2026 18:52:56 +0200 From: Andy Shevchenko To: correctmost , Mika Westerberg Cc: dmaengine@vger.kernel.org, regressions@lists.linux.dev, vkoul@kernel.org, linux-i2c@vger.kernel.org Subject: Re: [REGRESSION][BISECTED] Lenovo IdeaPad touchpad does not work when idma64 is present in initramfs Message-ID: References: <51388859-bf5f-484c-9937-8f6883393b4d@app.fastmail.com> Precedence: bulk X-Mailing-List: dmaengine@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Organization: Intel Finland Oy - BIC 0357606-4 - c/o Alberga Business Park, 6 krs, Bertel Jungin Aukio 5, 02600 Espoo +Cc: Mika On Mon, Jan 12, 2026 at 04:35:08PM +0200, Andy Shevchenko wrote: > On Tue, Dec 16, 2025 at 12:57:10PM -0500, correctmost wrote: > > > The following commit > > No, it's false positive. The reality is that something else is going on > there on this and other similar laptops. > > > causes my Lenovo IdeaPad touchpad not to work when > > kernel/drivers/dma/idma64.ko.zst is present in the initramfs image: > > > > #regzbot introduced: 9140ce47872bfd89fca888c2f992faa51d20c2bc > > > > "idma64: Don't try to serve interrupts when device is powered off" > > So, the touchpad is an I²C device, which is connected to an Intel SoC. > The I²C host controller is Synopsys DesignWare. On Intel SoCs the above > mentioned IP is generated with private DMA engine, that's called Intel > iDMA 64-bit. Basically it's two devices under a single PCI hood. > The problem here is that when PCI device is in D3, both devices are > powered off, but something sends an interrupt and it's not recognized > being the one, send by a device (touchpad). > > There is one of the following potential issues (or their combinations): > > - the I²C host controller hardware got off too early > - the line is shared with something else that generates interrupt storm > - the BIOS does weird (wrong) things at a boot time, like not properly > shutting down and disabling interrupt sources; also may have wrong > pin control settings > - the touchpad is operating on higher frequency like 400kHz (because > BIOS told to use that one instead of 100kHz) than the HW is designed > for and hence unreliable with all possible side effects > - the touchpad firmware behaves wrongly on some sequences (see also > note about the bus speed above), try to upgrade touchpad FW > > With my experience with the case of the above mentioned commit that it > may be BIOS thingy. Also consider the bus speed, there are quirks in > the kernel for that. > > > Here are the related logs: > > > > --- > > > > irq 27: nobody cared (try booting with the "irqpoll" option) > > Almost all below is not so interesting. > > ... > > > handlers: > > [<00000000104a7621>] idma64_irq [idma64] > > [<00000000bd8d08e9>] i2c_dw_isr > > Disabling IRQ #27 > > Yes, this line at least shared between those two and might be more. > > ... > > > i2c_designware i2c_designware.0: controller timed out > > hid (null): reading report descriptor failed > > i2c_hid_acpi i2c-ELAN06FA:00: can't add hid device: -110 > > i2c_hid_acpi i2c-ELAN06FA:00: probe with driver i2c_hid_acpi failed with error -110 > > Yes, sounds familiar with the speed settings. Try to down it to 100kHz in case > it's confirmed to be 400kHz. > > > --- > > > > Hardware info: > > - Lenovo 16" IdeaPad Slim 5 - 16IRU9 > > - Hardware name: LENOVO 83FW/LNVNB161216, BIOS PFCN14WW 09/20/2024 > > - ELAN06FA:00 04F3:327E Touchpad > > > > Steps to reproduce: > > - Cold boot the laptop on Arch Linux > > > > The bug is still present with the 6.19.0-rc1-1-git kernel. > > > > The bisected commit is from March 2024, but I only recently noticed the issue > > because the initramfs images on Arch Linux now include these additional > > drivers (as of November 2025): > > - kernel/drivers/dma/idma64.ko.zst > > - kernel/drivers/mfd/intel-lpss-pci.ko.zst > > - kernel/drivers/mfd/intel-lpss.ko.zst > > > > Two other users have reported the issue on the Arch Linux and CachyOS forums, > > Any pointers to that thread, please? > > > so I don't think this is a hardware issue with my individual laptop. > > I don't know how this conclusion is came here. You mean HW as laptop model? > But are the involved components the same (I²C host controller + touchpad)? -- With Best Regards, Andy Shevchenko