Comment # 38 on bug 102646 from bmilreu@gmail.com

(In reply to Alex Deucher from comment #36)
> *** Bug 105300 has been marked as a duplicate of this bug. ***

https://bugs.freedesktop.org/show_bug.cgi?id=108322 - Also related. 

When I tested 4.18 kernel the bug used to trigger only @>73hz after
sleep/wakeup. In latest drm-next-4.21-wip triggers as soon as I switch to 75hz.
If I switch back from 75hz to 60hz it keeps flickering until I manually turn my
monitor off/on.