I am using Ubuntu 17.10 and experiencing freezing that I believe is the graphics driver. I tried installing the latest driver from AMD's website but end up with this screen on reboot:
I tried previous driver versions as well with same result.
$ sudo lshw -c video *-display description: VGA compatible controller product: Ellesmere [Radeon RX 470/480] vendor: Advanced Micro Devices, Inc. [AMD/ATI] physical id: 0 bus info: pci@0000:22:00.0 version: e7 width: 64 bits clock: 33MHz capabilities: pm pciexpress msi vga_controller bus_master cap_list rom configuration: driver=amdgpu latency=0 resources: irq:303 memory:e0000000-efffffff memory:f0000000-f01fffff ioport:e000(size=256) memory:fe800000-fe83ffff memory:c0000-dffff 2 Reset to default