I tried to install amdgpu-pro-21.10-1247438-ubuntu-20.04 driver to be able to get hardware aceleration on my machine but after installing without errors and rebooting I have no login screen.
When I login trough console and try to startx there is an error and it exits.
Bellow are excerpts of Xorg.0.log file, if you need more info just ask.
[ 220.407] X.Org X Server 1.20.9
X Protocol Version 11, Revision 0
[ 220.407] Build Operating System: Linux 4.15.0-140-generic x86_64 Ubuntu
[ 220.407] Current Operating System: Linux Valium 5.4.0-72-generic #80-Ubuntu SMP Mon Apr 12 17:35:00 UTC 2021 x86_64
[ 220.407] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-5.4.0-72-generic root=/dev/mapper/vgubuntu-root ro quiet splash vt.handoff=7
[ 220.407] Build Date: 08 April 2021 12:29:22PM
[ 220.407] xorg-server 2:1.20.9-2ubuntu1.2~20.04.2 (For technical support please see http://www.ubuntu.com/support)
[ 220.408] Current version of pixman: 0.38.4
...
[ 220.516] (II) modesetting: Driver for Modesetting Kernel Drivers: kms
[ 220.516] (II) FBDEV: driver for framebuffer: fbdev
[ 220.516] (II) VESA: driver for VESA chipsets: vesa
[ 220.517] (II) [KMS] drm report modesetting isn't supported.
[ 220.517] (EE) open /dev/dri/card0: No such file or directory
[ 220.517] (WW) Falling back to old probe method for modesetting
[ 220.517] (EE) open /dev/dri/card0: No such file or directory
[ 220.517] (II) Loading sub module "fbdevhw"
[ 220.517] (II) LoadModule: "fbdevhw"
[ 220.518] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so
[ 220.518] (II) Module fbdevhw: vendor="X.Org Foundation"
[ 220.518] compiled for 1.20.9, module version = 0.0.2
[ 220.518] ABI class: X.Org Video Driver, version 24.1
[ 220.518] (**) FBDEV(2): claimed PCI slot 4@0:0:0
[ 220.518] (II) FBDEV(2): using default device
[ 220.518] (EE) Screen 0 deleted because of no matching config section.
[ 220.518] (II) UnloadModule: "radeon"
[ 220.518] (EE) Screen 0 deleted because of no matching config section.
[ 220.518] (II) UnloadModule: "modesetting"
[ 220.519] (II) FBDEV(0): Creating default Display subsection in Screen section
...
