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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
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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)?