Question: how does VK_KHR_present_wait interacts with DPMS?

[yshui]

I am asking because over here in Xorg/GL land the somewhat analogous (but much less powerful) APIs, e.g. glXWaitVideoSyncSGI, or the Xorg Present extension, tend to misbehave when the monitor is turned off by DPMS. Depends on the drivers used we see events with duplicate MSCs, applications entering a busy loop, or other kinds of problems.

VK_KHR_present_wait specifies that presentation is only complete when the user sees the first pixel, which implies that if a present is initiated just before the monitor is turned off, it will only complete after the monitor is turned back on, which can be indefinitely far into the future. I just want to get a clarification whether that's indeed the case.

Thanks!