Comment 4 for bug 1636486

After a long search for many many weeks/months, I have found this post. I own a Lenovo T550 and tried different versions of Ubuntu's, to connect to my 2 external Asus PB279Q (4K) via Displayport (1.2). Tried as well via the docking-station and the DP in the laptop itself (connecting both gives me dual 4K @60hz :). Tried monitors also separately/alone, same issue with *exactly the same symptoms* like described here above. Yesterday found, I even downloaded and tried the latest 17.04 (Beta 2), issue is still present.

The screen flickering is random (goes completely black for a few seconds) doing normal browsing work, study, etc. But the blinking considerably occurs much more often, when the terminal window is open. It appears to be occuring depending of the type of content being displayed (e.g. when using phpstorm in 'darcula' mode, it also occurs more). It appears the displayport suddenly goes haywire and switches back.
Lowering working-resolution to 2560x1440 and the issue appears to be vanished.

I tried as well with the default (standard) driver, as well with the ones I found and installed from 01.org.

I work with Ubuntu on user-level, developing web apps. I am handling myself, never did reported these issues, so this is new to me. But since we searched for such a long time without solution found, almost reaching the limits of our patience, I think it's about time and worth to report... (hoping one day for a fix/solution)

I know more or less how to reproduce the issue (although it's random, sometimes I need patience, I can let it 'trigger' more quickly), my feedback may be of any help? If there's some kind of instructions I can follow how to pull out relevant logs (I'm not noob, but also not yet a guru...)
I can try to pull them out and post them here if wished/required.