For what it's worth, I'm running this on an Ubuntu 16.04 server with the 4.15.0 kernel. I don't really care about performance, as this is just the OS drive. The troubleshooting in this thread led me to realize it's an issue when the SSD is connected to the chipset SATA ports, so swapping to a non-chipset SATA port (in my case, the additional Gigabyte SATA ports) is the perfect solution for me. ... View more

I have the same problem on a Gigabyte GA-MA790XT-UD4P motherboard with an AMD Phenom II X6 1100T. Luckily this motherboard comes with two "GSATA" ports that don't run from the AMD chipset, so moving the SSD from the AMD chipset-based SATA port to the GSATA port seems to have fixed it. ... View more