(In reply to Lyude Paul from comment #3)
> Just a note: I definitely don't have the time to take a closer look at this.
> If someone from AMD could take a look that would be /REALLY/ appreciated.

We are currently working on a MST downstream issue. The payload bw is failed to
get removed for the unplugged MST monitor that exhausts payload bw. You may
have a quick try to see if that helps.