Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Fri, 5 Aug 2022 16:01:44 +0300
From:   Mika Westerberg <mika.westerberg@linux.intel.com>
To:     Brad Campbell <lists2009@fnarfbargle.com>
Cc:     linux-kernel@vger.kernel.org
Subject: Re: Apple Thunderbolt Display chaining
Message-ID: <Yu0UuOVGeIv/U+jU@lahna>
References: <YkcMofXKr/ZmOSwH@lahna>
 <7ea44c20-6c65-224f-af7b-aa1bd310d038@fnarfbargle.com>
 <YkrEE0uh9EVCchfl@lahna>
 <d112651d-919d-ce2d-efac-6abbd9de0f07@fnarfbargle.com>
 <YkrqL/wnACNVOpSi@lahna>
 <ae336e2d-8e7c-9167-ab3d-8d642cd4fb2c@fnarfbargle.com>
 <Yk2qMt568oEeTj8H@lahna>
 <49183e52-2e73-b32f-11ad-6036b1040d7c@fnarfbargle.com>
 <Yuz/Q3MTVIhCZU+0@lahna>
 <f5c8b9f0-0d6d-c6db-ae0b-894acb58d078@fnarfbargle.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <f5c8b9f0-0d6d-c6db-ae0b-894acb58d078@fnarfbargle.com>
Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo
Precedence: bulk

On Fri, Aug 05, 2022 at 08:43:08PM +0800, Brad Campbell wrote:
> > Well can you try so that you disable PCIe PM for starters? Pass
> > "pcie_port_pm=off" in the command line and see if anything changes. Of
> > course this prevents low power states.
> > 
> 
> That allows me to modprobe thunderbolt from an xterm :

Okay does it work any better if you don't have anything attached to the
TBT ports when you boot up? If it does, how about just adding a single
device (no display connected)?