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[Centos 7.6] display manager doesn't work after AMD GPU installation

Question asked by thanosstr on Mar 13, 2019
Latest reply on Mar 13, 2019 by thanosstr

Hello everyone,

I installed the AMD GPU driver (amdgpu-pro-18.50-725072-rhel-7.6) in Centos 7.6
(kernel: 3.10.0-957.el7.x86_64) for this GPU model (AMD Vega Series X 64).
The installation was based on the guidelines in the documentation and everything went smoothly. 
The problem is that when I boot the machine I cannot enter the graphical interface where the usernames appear to login.
It looks like it stuck somewhere. However, ssh connection works and OpenCL also works. Then I logged in a terminal and
checked that the display manager is active. When I restart the service it blinks to a black screen and returns to the same window.
However in the dmesg report, the following message appears: 
gnome-session-c[8235]: segfault at 10 ip 00007f89a31e84e2 sp 00007ffe2b26de80 error 4 in[7f89a31e1000+b000]"
For the record, this message and the same behaviour remains even when the GPU is not plugged in the machine.
I also tried startx command and reports:
"xinit: connection to X server lost".
Can someone give a hint for this problem?