From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.19]) (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 9A1082E737E; Tue, 6 Oct 2026 11:01:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.19 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791284477; cv=none; b=Gb0ommcBILubQixgcyWFBSxXxUTtpb0nHU6DaZuUgMscLmOr+ikI+Zm9igB6X2WgqwkkYm9QBpAZLanAMdNQwBRVjZN7iO8MrAmdDNtEf0rzvup+G9dmbudmrP7xKdtGsiKuWwqrtLfCfv3d9IWLHY8XtFKmKR8NV9YEP22ar3M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791284477; c=relaxed/simple; bh=Wy1xkXhxTU+WKZ1GVuZmF/3N3CBqTGwfB3+4nEXevhg=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=rPOw8LCBGoydNi3PYOhZWCCiU8hAwyNwdZa9Q/C98VBmDQsqEqGOjiJyDbFsIz5w8zMAup7oKufHOce0Cz1BlxyHT8W3/v1Ye/PXbEI216WP8gjft4CaJhn0d1QQS25aM2AzbqzpfuTm3UU5flu37zRyRd0NLLAJGPqln7eRm1g= 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=oK0ifYDl; arc=none smtp.client-ip=198.175.65.19 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="oK0ifYDl" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1791284476; x=1822820476; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=Wy1xkXhxTU+WKZ1GVuZmF/3N3CBqTGwfB3+4nEXevhg=; b=oK0ifYDl8tWakOU+A2lo5E14wJDyC3WRNTt12H3gFt4WLkF+5Q4s7+o/ 0SnyZ3zL0oOWlwNNqRqBRRFpapPen8zuox098pdziGr6wF6IPluFRw0Uo CLXOUBhmTybYK77eOmpHQeFM8Ww/cwv4P6dhEQcNVSD5LAIXRFfoj3fhW 0OY4tJhhxyF4FX1cPisimKd8Z/vngQW2CMk7kUOSzDEmfMpvSFQuljiMU EvZW0gATkobaNuSxBDvJ7z2nmvBP+nnj041rvmqEGZgrgVh1LDlFbjmcI ceAZCSVtIvmBmNXCbkwkR8ccKyzSrfFD9yUMvQzDJb1xyffn8Oj/gfIK3 A==; X-CSE-ConnectionGUID: JdPdG37eQoS/Vpaa2uVv7A== X-CSE-MsgGUID: 2+M3UOMMRiW8OOXuWwDySQ== X-IronPort-AV: E=McAfee;i="6800,10657,11926"; a="28273" X-IronPort-AV: E=Sophos;i="6.27,143,1787036400"; d="scan'208";a="28273" Received: from fmviesa012.fm.intel.com ([10.60.135.152]) by orvoesa111.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Oct 2026 04:01:15 -0700 X-CSE-ConnectionGUID: oNHqWV7wRN6ZxiV45KNihw== X-CSE-MsgGUID: JHZQnhpzTvKT1ViAq2njVg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.27,143,1787036400"; d="scan'208";a="1189089" Received: from black.igk.intel.com ([10.91.253.5]) by fmviesa012.fm.intel.com with ESMTP; 06 Oct 2026 04:01:13 -0700 Received: by black.igk.intel.com (Postfix, from userid 1001) id 54F6899; Tue, 06 Oct 2026 13:01:12 +0200 (CEST) Date: Tue, 6 Oct 2026 13:01:12 +0200 From: Mika Westerberg To: hans@kilurion.com Cc: Mika Westerberg , Andreas Noever , Yehezkel Bernat , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] thunderbolt: Keep Meteor Lake host routers powered in DP redrive mode Message-ID: <20261006110112.GP176164@black.igk.intel.com> References: <20261006-tb-mtl-redrive-v1-1-5ec921114c37@kilurion.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20261006-tb-mtl-redrive-v1-1-5ec921114c37@kilurion.com> Hi, On Tue, Oct 06, 2026 at 10:06:43AM +0200, Hans van Essen via B4 Relay wrote: > From: Hans van Essen > > When a DisplayPort Alt Mode (non-Thunderbolt) dock is connected to the > USB4 port of an Arrow Lake-H system with the integrated Meteor Lake-P > host router (8086:7ec2), the USB functions of the dock work but the DP > AUX transfers time out and no monitor is detected. It only works if the > port was used with a Thunderbolt dock before and the system was not > powered off in between; suspend and warm reboot keep it working. > > The Barlow Ridge host routers already have QUIRK_KEEP_POWER_IN_DP_REDRIVE > so that the host router does not enter runtime suspend while the USB4 > port is in DP redrive mode. Apply the same quirk to the integrated > Meteor Lake host routers. With this the driver logs "enter redrive mode, > keeping powered" when the dock is plugged in and the monitors come up > after a cold boot. Yes, Barlow Ridge needs it but it's a special case. ARL should not need this - its all routed internally so something else is wrong here. Can you share full dmesg when this issue happens? Please add thunderbolt.dydnbg=+p too although this really has nothing to do with TB if the port is in redrive mode.