(In reply to Bjorn from comment #48)
> I managed to compile and test drm-next-4.17-wip, commit
> a611dd16c69025b6df115427af0a5d63ae9f5145.
> 
> I can confirm that I did not see the amdgpu crash on boot any more. However,
> suspend/resume still hangs my laptop.
> 
> So not sure if my suspend/resume hangs are related at all to this particular
> bug, but I was hoping to get some help in figuring this out. Eg, any way I
> can get some useful logging information out of a hanged session? In
> particular, suspend seems to work as I can hear the fans etc turn off when I
> close the lid. If I then open the lid and wait for a bit, they start up
> again but my screen remains blank.

I had similar problems in the past, but with the latest version of
drm-next-4.17-wip (09695ad78f1f) PLUS the backlight patch in comment 34 applied
on top of that, my system is now very nice and stable! So maybe try that out
and let us know how it goes?