[Bug 108981] New: Kernel 4.19 won't boot with amdgpu (black screen) for some video cards

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108981

            Bug ID: 108981
           Summary: Kernel 4.19 won't boot with amdgpu (black screen) for
                    some video cards
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Driver/AMDgpu
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: sonichedgehog_hyperblast00 at yahoo.com
        QA Contact: xorg-team at lists.x.org

I'm running into a major issue which seems to have been introduced with Kernel
4.19.1 and later (did not occur in 4.18.5). My OS is openSUSE Tumbleweed x64
with the last working snapshot being 20181112.

My machine refuses to boot and remains stuck at a black screen after issuing
the boot command in grub2. The HDD led flashes a few times shortly after grub2
disappears, but after that it will stay off and nothing new happens. I cannot
use "control + alt + fN" to switch to a different runlevel either, however I'm
still able to toggle the NumLock / CapsLock leds which means the system isn't
freezing up entirely. The computer won't respond to the power button and has to
be restarted via the reset button.

The issue is specific to the amdgpu module: Kernel 4.19 will boot successfully
if using the radeon and not amdgpu driver. I'm able to load it after removing
the following parameters from my Kernel command line:

radeon.si_support=0 radeon.cik_support=0 amdgpu.si_support=1
amdgpu.cik_support=1

I can confirm that the problem is video card specific: My mother's computer
also uses openSUSE Tumbleweed and has the latest snapshot, as well as the same
kernel parameters for amdgpu. For her there are absolutely no issues when
booting with 4.19. I'm pondering whether this Kernel introduces an issue in
amdgpu which affects GCN 2.0 video cards explicitly.

My affected video card is a Radeon R9 390 8GB (GCN 2.0). My mother's working
video card is a Radeon R7 370 2GB (GCN 1.0).

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