Re: [BUG] PCI/USB4: AMD Phoenix 1022:14ef runtime suspend prevents JHL9480 downstream enumeration

[Mika Westerberg <mika.westerberg@linux.intel.com>]

Hi,

Adding AMD folks in case this is known issue.

On Sat, Sep 19, 2026 at 12:39:37PM +0000, Freeman Z wrote:
> Hello,
> 
> I am seeing a reproducible USB4/PCIe runtime-PM problem on an ASUS ROG
> Flow X13 GV302XV (Ryzen 9 7940HS / Phoenix) with a Kensington SD5000T5
> EQ Thunderbolt 5 dock connected to the laptop's USB4 host port.
> 
> The failure is reproducible with the official Arch Linux Live ISO using
> Arch's stock `linux` kernel:
> 
>     7.2.2-arch1-1
> 
> I have not yet tested a self-built kernel.org mainline/vanilla kernel.
> I can test patches, or collect additional traces if requested.

Can you provide full dmesg with "thunderbolt.dyndbg=+p" in the kernel
command line?

With the below steps (following your description):

0. Drop all non-standard command line options except the above.
1. Boot the system up, nothing connected.
2. Once up let the TB and the related PCIe root ports enter D3cold (don't
   run lspci it will wake them up but you can look at the runtime status that
   they are all suspended).
3. Plug in the dock.

We should see in the dmesg the PME if it works as expected. If not then it
may be that there is something wrong with the wakeup path.