https://bugs.freedesktop.org/show_bug.cgi?id=110199
--- Comment #15 from guimarcalsilva@gmail.com --- Tested today with Linux Manjaro 18.1 and kernel 5.2.11-1-MANJARO. The problem persists, but I can fix it by changing the refresh rate from 75 to 60 and back to 75 too after every boot.