[Bug 107913] New: amdgpu_drv.so segfaults on boot; black screen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107913

            Bug ID: 107913
           Summary: amdgpu_drv.so segfaults on boot; black screen
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/AMDgpu
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: freedesktop at kai.giebeler.de
        QA Contact: xorg-team at lists.x.org

Created attachment 141539
  --> https://bugs.freedesktop.org/attachment.cgi?id=141539&action=edit
Xorg.0.log including the segfoult

History (maybe only partly related to the problem):
I followed this guide to update my drivers:
https://github.com/ValveSoftware/Proton/blob/proton_3.7/PREREQS.md

sudo add-apt-repository ppa:paulo-miguel-dias/mesa
sudo apt dist-upgrade
sudo apt install mesa-vulkan-drivers mesa-vulkan-drivers:i386

which worked fine for some days. I updated my system as normal (via apt) and
after a reboot the machine came up with a black screen.

I found a segfault in my Xorg.0.log (attached). Blacklisting the module
"amdgpu" lets me boot into the desktop using only the integrated Intel GPU.

Some information that are hopefully helpful:

$ lspci -k
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 620 (rev 02)
        Subsystem: Dell HD Graphics 620
        Kernel driver in use: i915
        Kernel modules: i915
01:00.0 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] Topaz XT
[Radeon R7 M260/M265 / M340/M360 / M440/M445] (rev c3)
        Subsystem: Dell Radeon R7 M445
        Kernel modules: amdgpu

$ uname -a
Linux notebook-kai 4.15.0-34-generic #37-Ubuntu SMP Mon Aug 27 15:21:48 UTC
2018 x86_64 x86_64 x86_64 GNU/Linux

My PC is a notebook with an integrated Intel GPU and a dedicated AMD GPU.
OS is Linux Mint 19 Cinnamon
CPU is Intel© Core™ i7-7500U CPU @ 2.70GHz × 2

What else is needed?
Can I somehow re-install or downgrade the amdgpu-drivers?

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