Created attachment 135450 [details]
dmesg errors

I installed Ubuntu Mate 17.10 and M-bab drivers
(https://github.com/M-Bab/linux-kernel-amdgpu-binaries, without them one
monitor is always black but powered on). 

Almost every day system freezes suddenly after random amount of time, which can
be from 5 minutes to 3+ hours. Only power button helps, no logs are saved but
dmesg has errors. 

I think this is either AMDGPU bug or something ryzen related (most likely not,
because they manifest as sudden reboots, never as system freezes. And last bios
update stopped them 2 months ago).

Graphics:  Card: Advanced Micro Devices [AMD/ATI] Tonga PRO [Radeon R9 285/380]
           Display Server: x11 (X.Org 1.19.5 )
           drivers: ati,amdgpu (unloaded: modesetting,fbdev,vesa,radeon)
           Resolution: 1920x1080@60.00hz, 1920x1080@60.00hz
           OpenGL: renderer: AMD Radeon R9 200 Series (TONGA / DRM 3.23.0 /
4.13.11+, LLVM 5.0.1)
           version: 4.5 Mesa 17.4.0-devel