[Bug 199567] New: [amdgpu] just a black screen irrespective of amdgpu.dc=1 or 0 at boot on kernels 4.17-rc2 and onwards

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https://bugzilla.kernel.org/show_bug.cgi?id=199567

            Bug ID: 199567
           Summary: [amdgpu] just a black screen irrespective of
                    amdgpu.dc=1 or 0 at boot on kernels 4.17-rc2 and
                    onwards
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.17-rc2
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@xxxxxxxxxxxxxxxxxxxx
          Reporter: untaintableangel@xxxxxxxxxxxxx
        Regression: No

Hardware: AMD RX480 (XFX black edition
Currently using amdgpu and testing how awesome dc code is coming along on a
custom kernel.

Shortly after the patches went through the other week that stopped the recent
flickering, everything was (and still is) fine on kernel 4.17-rc1.

Patches prior to rc2 (and onwards, including latest build and rc3 when tagged
which are still broken for me) cause an unresponsive black screen on loading
the kernel. Have to manually restart into another kernel.

As far as I can tell, there were 3 patches to this area before rc2 was tagged
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=221bda4b5f1abfd74159d7bf3703affa62468030

but I tried reverting the one intended to fix 'black screens' without success.

However, just after rc1 was tagged, there's a big chunk of patches
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8089f9f5a32938ddefb1767b8ee14bb7996e5e2f

so it might have been something in that? If so, the problem still exists in
what will become rc3 at the time of writing.

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