DisplayPort HPD IRQ and Power Down mode

Hi,
I've been working with the DisplayPort IP V6.0 for a while now and have come across some potentiall undesireable/unspecified behaviour. All transactions on the AUX channel have been monitored using a Unigraf DPA-400 1.2 for reference
We have the IP configured as sink device and have had reports recently that when a DP source is connected to our card and out card is repowered, the DP source (PC graphics card), seems to write to DPCD register 0x00600 and set us into the D3 power down mode (b'10'). Shortly after this the sink generates a HPD IRQ signal to the source to indicate that it requries attention (see BlackScreens_on_Projector_Reboot.html, lines 388 and 398) . However, conducting the same test (power down and then up of a Dell 4K monitor), does not generate this HPD IRQ after being set in the power down mode (see Dell_Monitor_Power_Down, line 153 onwards).
Every time I have monitored the AUX bus and seen the DIsplayPort IP being set into power down mode, a HPD_IRQ is generated.
The DP 1.2 specification states:
2.9.3.5 Link Maintenance
The Sink device must maintain the Link Status flags in DPCD registers 00202h-00204h during normal
operation. Upon loss of synchronization with the Source for any reason other than after receiving a
SET_POWER_STATE (DPCD 00600h) to 10b request, or to request retaining the link for any reason, the Sink
must clear INTERLANE_ALIGN_DONE and generate a distinct IRQ_HPD (i.e. distinct from an IRQ_HPR
generated for any other reason).
I have looked at the software to confirm it is not the software generating the HPD_IRQ by writing to register 0x02C and have also confirmed this by monitoring the internal AXI bus to the core using the ILA. No writes are occurring to this register, therefore something in the core would seem to be generating this IRQ when it shouldn't be. As the source code for the DisplayPort IP is encrypted it is difficult to trace this problem any further.
To test this in isolation would require and AUX channel master that would undertake link training and then write to the SET_POWER_STATE register. Unfortunately the only DP sources we have are graphics cards at this point. Any suggestions on this front would be appreciated.
I have raised this with our FAE but thought I'd post here to see if anyone else has seen this behaviour.
Regards
Simon

Hi Bryan
I have the older miniStack. It does power down when the drive is not in use.

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