Re: DPMS over DP->DVI adapter not working
Based on your latest information (particularly the fact that you see the flickering when switching to a VT), I don't think your problem could be related to the other one we're investigating.
I would imagine that swapping the displays doesn't help, either...
We continue to be unable to reproduce this at NVIDIA, but we also don't have the exact monitor and dongle combination that you have... It might be worth raising the issue with Dell: if they are able to reproduce the issue on their end, then they should be able to provide us with the hardware we need. If they aren't, then maybe you do simply have a broken dongle / GPU board / monitor and replacing the component in question will resolve your issue.