Comment 15 for bug 1793965

Wow I'm not alone! Happens with the same hardware. Dell 5520 with a TB16 dock. After login it now goes through up to 6 cycles of blank to normal screens before it stabilizes after 30-60 seconds. It's connected to a Dell 4k monitor via displayport. The TB16 side is using a normal DP connector and the monitor side is using a mDP connector. I mention this because previously I had the cable connected the other way (mDP connector on TB16) and it would flicker a little less (up to 4 times max).

I wonder if because of the change in behavior when swapping the cable ends if this is an issue of the dock not supplying enough power initially? Just a thought - I have no evidence to support this.

It may also be worth mentioning that I'm driving the monitor at 4k/60Hz.