Re: [RFC][PATCH] thunderbolt: Quiesce AMD NHI during suspend

[Mario Limonciello <superm1@kernel.org>]

On 7/15/26 00:42, Chia-Lin Kao (AceLan) wrote:

>> Thanks for checking.  That code ended up not helping the original issue it
>> was for, a different solution for that issue is being provided.
>>
>> But I'm wondering, is this issue you're working on something to do with
>> pm_async?  Could you turn that off and see if it improves anything?
> 1. echo 0 | sudo /sys/power/pm_async
> 2. sudo systemctl suspend
> 3. plug in the tbt dock
> 4. power indicator shows 3A5W lights and hard hang

I'm not sure what 3A5W lights means.  You'll probably need to check with 
ODM if that's a post code or what it is.  It certainly sounds useful to 
someone.

Are you sure the hang is during resume?  It /sounds/ like it's during 
suspend.

> 
>>
>> Any chance you can get UART output from the system using a debug board over
>> suspend/resume in case there is a panic happening that doesn't flush to
>> NVME?
> No, there is no UART port on the machine for debugging.
> 
Can you please check with ODM about this?  For pre-production systems 
there should be a debug card that can provide UART output so we can 
cross reference that.

Also; does this only happen on this system or you can reproduce on a 
reference system?  If you can reproduce on a reference system UART is 
very easily accessible which would make this easier to debug.