https://bugs.freedesktop.org/show_bug.cgi?id=93826
--- Comment #38 from Yves W. yves.weber@yahoo.de --- (In reply to Jan Niklas Hasse from comment #37)
Sorry, but I don't know what you mean by "using bitsect".
Changes to the source code of the driver are controlled via Git as commits. Assuming it once worked 144 Hz it's possible to use Git to find out which commit caused the flickering. This is done by identifying any commit which worked (good, in your case 4.4) and a commit which doesn't work (bad, 4.8). Bisecting will then help you find the first bad commit faster (by sectioning the pool of possible first bad commits in two sections repeatedly).
I'm not sure though that this good commit exists though. Flickering also happens with 4.4 for me.
means i have to try manually each step and recompile kernel? But that will take ages :) I don't have that much time.
btw mint 18 kernel updated to 4.4.0-43-generic It's still working like charm with 144hz @ 1440p - no flickering .. :)