I reinstalled my desktop but I have the same results.

I tried

amdgpu.dc=0 on the kernel command line but no results, I have black screen.

It's working with kernel 4.17.* but not working with kernel 4.18.* or 4.19.*

Wich new details you need for solving this issue ?

Scuse me for delay but I had a two weeks holliday.

I have installed in my desktop Ubuntu 18.10.

Maybe it's usefull, you may see bellow:
 dpkg --list | grep mesa
ii  libegl-mesa0:amd64                               18.1.5-1ubuntu1                                 amd64        free implementation of the EGL API -- Mesa vendor library
ii  libegl1-mesa:amd64                               18.1.5-1ubuntu1                                 amd64        transitional dummy package
ii  libgl1-mesa-dri:amd64                            18.1.5-1ubuntu1                                 amd64        free implementation of the OpenGL API -- DRI modules
ii  libgl1-mesa-glx:amd64                            18.1.5-1ubuntu1                                 amd64        transitional dummy package
ii  libglapi-mesa:amd64                              18.1.5-1ubuntu1                                 amd64        free implementation of the GL API -- shared library
ii  libglu1-mesa:amd64                               9.0.0-2.1build1                                 amd64        Mesa OpenGL utility library (GLU)
ii  libglx-mesa0:amd64                               18.1.5-1ubuntu1                                 amd64        free implementation of the OpenGL API -- GLX vendor library
ii  mesa-utils                                       8.4.0-1                                         amd64        Miscellaneous Mesa GL utilities
ii  mesa-va-drivers:amd64                            18.1.5-1ubuntu1                                 amd64        Mesa VA-API video acceleration drivers
ii  mesa-vdpau-drivers:amd64                         18.1.5-1ubuntu1                                 amd64        Mesa VDPAU video acceleration drivers

On Wednesday, August 29, 2018, 10:22:40 AM GMT+3, Felix Ezaru <efelixro@yahoo.com> wrote:

I tried to add amdgpu.dc=0 on the kernel command line, but this does not avoid the back screen.

The screen go black when the amdgpu driver is loaded because I can catch to see nothing. I see bootloader only, I choose the kernel version for boot and then back screen.

I don't know what to say but yesterday after I updated/upgraded all the packages , the screen go back if I boot also kernel 4.17.*

I'll try to reinstall my desktop and I'll be back with my new details. I'm afraid I have an issue at my monitor (It's a TV).

On Tuesday, August 28, 2018, 10:47:31 AM GMT+3, <bugzilla-daemon@freedesktop.org> wrote:

Michel Dänzer changed bug 107698

What	Removed	Added
CC		harry.wentland@amd.com, sunpeng.li@amd.com

Comment # 4 on bug 107698 from Michel Dänzer

Does amdgpu.dc=0 on the kernel command line avoid the black screen?

Does the screen go black when the amdgpu driver is loaded, or only when the
login screen is supposed to start?

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