Same here, I'm using opensuse Leap 15 and Ubuntu 18.10, both 4.12 and 4.18 kernel suffer the same issue. I'm using AMD Ryzen 5 1600 with Asrock Fatal1ty AB350 Gaming-ITX/ac board. I'll try updating the latest bios to see if things got fixed.
Same here, I'm using opensuse Leap 15 and Ubuntu 18.10, both 4.12 and 4.18 kernel suffer the same issue.
I'm using AMD Ryzen 5 1600 with Asrock Fatal1ty AB350 Gaming-ITX/ac board.
I'll try updating the latest bios to see if things got fixed.