Created attachment 135238 [details]
journalctl_radeon_4.14.0-041400rc7

[AMD/ATI] Tahiti LE [Radeon HD 7870 XT]
4.14.0-041400rc7-generic from: http://kernel.ubuntu.com/~kernel-ppa/mainline/
OpenGL version string: 3.0 Mesa 17.3.0-rc2 - padoka PPA

Basically still the same, black screen then:
radeon 0000:01:00.0: ring 0 stalled for more than 10244msec

And then:
radeon 0000:01:00.0: GPU reset succeeded, trying to resume

That's the last line in log file, after this I can no longer connect via ssh.