Blackscreen after installing AMD driver 18.30 for Vega 64 on Ubuntu 18.04.1 (HDMI EDID 2.0 issue)

Submitted by Gleb Zasyadko

Assigned to Default DRI bug account

Link to original bug (#107690)

Description

GPU manager log:

log_file: /var/log/gpu-manager.log
last_boot_file: /var/lib/ubuntu-drivers-common/last_gfx_boot
new_boot_file: /var/lib/ubuntu-drivers-common/last_gfx_boot
can't access /run/u-d-c-nvidia-was-loaded file
can't access /opt/amdgpu-pro/bin/amdgpu-pro-px
Looking for nvidia modules in /lib/modules/4.15.0-33-generic/updates/dkms
Looking for amdgpu modules in /lib/modules/4.15.0-33-generic/updates/dkms
Is nvidia loaded? no
Was nvidia unloaded? no
Is nvidia blacklisted? no
Is intel loaded? no
Is radeon loaded? no
Is radeon blacklisted? no
Is amdgpu loaded? yes
Is amdgpu blacklisted? no
Is amdgpu versioned? no
Is amdgpu pro stack? no
Is nouveau loaded? no
Is nouveau blacklisted? no
Is nvidia kernel module available? no
Is amdgpu kernel module available? no
Vendor/Device Id: 1002:687f
BusID "PCI:11@0:0:0"
Is boot vga? no
Vendor/Device Id: 1002:687f
BusID "PCI:14@0:0:0"
Is boot vga? no
Vendor/Device Id: 1002:687f
BusID "PCI:68@0:0:0"
Is boot vga? no
Vendor/Device Id: 1002:687f
BusID "PCI:71@0:0:0"
Is boot vga? yes
Found "/dev/dri/card3", driven by "amdgpu"
output 0:
card3-HDMI-A-4
Number of connected outputs for /dev/dri/card3: 1
Skipping "/dev/dri/card3", driven by "amdgpu"
Skipping "/dev/dri/card2", driven by "amdgpu"
Skipping "/dev/dri/card1", driven by "amdgpu"
Skipping "/dev/dri/card0", driven by "amdgpu"
Skipping "/dev/dri/card3", driven by "amdgpu"
Skipping "/dev/dri/card2", driven by "amdgpu"
Skipping "/dev/dri/card1", driven by "amdgpu"
Skipping "/dev/dri/card0", driven by "amdgpu"
Skipping "/dev/dri/card3", driven by "amdgpu"
Skipping "/dev/dri/card2", driven by "amdgpu"
Skipping "/dev/dri/card1", driven by "amdgpu"
Skipping "/dev/dri/card0", driven by "amdgpu"
Does it require offloading? no
last cards number = 4
Has amd? yes
Has intel? no
Has nvidia? no
How many cards? 4
Has the system changed? No
Unsupported discrete card vendor: 1002
Nothing to do