[amdgpu] xinit won't start without root privileges

[Toni Melisma]

When attempting to start xinit as a regular user, I simply get the error I don't have access rights to /dev/tty0

Even setting setuid and setgid bits on /usr/bin/Xorg or chmod 666 on /dev/tty0 doesn't work.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg (not installed)
ProcVersionSignature: Ubuntu 5.4.0-28.32-generic 5.4.30
Uname: Linux 5.4.0-28-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
Date: Thu Apr 30 14:43:26 2020
DistUpgraded: 2020-04-30 09:29:06,278 DEBUG Running PostInstallScript: './xorg_fix_proprietary.py'
DistroCodename: focal
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
 Advanced Micro Devices, Inc. [AMD/ATI] Wani [Radeon R5/R6/R7 Graphics] [1002:9874] (rev 87) (prog-if 00 [VGA controller])
   Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] Radeon R5 Graphics [1002:1871]
InstallationDate: Installed on 2019-12-21 (130 days ago)
InstallationMedia: Ubuntu-Server 19.10 "Eoan Ermine" - Release amd64 (20191017)
Lsusb:
 Bus 001 Device 003: ID 041e:324d Creative Technology, Ltd
 Bus 001 Device 002: ID 0438:7900 Advanced Micro Devices, Inc. Root Hub
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: HPE ProLiant MicroServer Gen10
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-28-generic root=UUID=dd6b3468-5d78-4b6e-960c-d9e3e418d8dc ro
SourcePackage: xorg
Symptom: display
Title: Xorg freeze
UpgradeStatus: Upgraded to focal on 2020-04-30 (0 days ago)
dmi.bios.date: 03/02/2018
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 5.12
dmi.board.asset.tag: Default string
dmi.board.name: ProLiant MicroServer Gen10
dmi.board.vendor: HPE
dmi.board.version: 871721-001
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 1
dmi.chassis.vendor: HPE
dmi.chassis.version: Default string
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr5.12:bd03/02/2018:svnHPE:pnProLiantMicroServerGen10:pvrRevB:rvnHPE:rnProLiantMicroServerGen10:rvr871721-001:cvnHPE:ct1:cvrDefaultstring:
dmi.product.family: ProLiant
dmi.product.name: ProLiant MicroServer Gen10
dmi.product.sku: 873830-421
dmi.product.version: Rev B
dmi.sys.vendor: HPE
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.101-2
version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.4-2ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20200226-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1