Oh a lot of things:
These are all I'm pretty sure.
Something really interesting happened. I tried switching to TTY and after I put my credentials in it came up with hundreds of warnings that nouveau is stalled at ffffffffffffffff. After that I can use the TTY with no issues though. I will try removing virt-manager in case that the issue.
Why is there nouveau ?
Can you tell what does
mhwd -li
Show
Sure, I was able start KDE. I modified .xinitrc and put startplasma-x11 instead of startkde and it worked.I think something's wrong with SDDM. Give me a moment for the mhwd list.
mhwd -li gives me:
Warning: No installed PCI configs!
Warning: No installed USB configs!
mhwd -l
> 0000:02:00.0 (0200:10ec:8168) Network controller Realtek Semiconductor Co., Ltd.:
--------------------------------------------------------------------------------
NAME VERSION FREEDRIVER TYPE
--------------------------------------------------------------------------------
network-r8168 2020.05.22 true PCI
> 0000:01:00.0 (0300:10de:1f15) Display controller nVidia Corporation:
--------------------------------------------------------------------------------
NAME VERSION FREEDRIVER TYPE
--------------------------------------------------------------------------------
video-optimus-manager 2020.12.08 false PCI
video-hybrid-amd-nvidia-dkms-prime-render-offloading 2020.12.07 false PCI
video-nvidia-dkms 2020.12.07 false PCI
video-linux 2020.12.03 true PCI
video-modesetting 2020.07.13 true PCI
video-vesa 2017.03.12 true PCI
> 0000:05:00.0 (0300:1002:1636) Display controller ATI Technologies Inc:
--------------------------------------------------------------------------------
NAME VERSION FREEDRIVER TYPE
--------------------------------------------------------------------------------
video-optimus-manager 2020.12.08 false PCI
video-hybrid-amd-nvidia-dkms-prime-render-offloading 2020.12.07 false PCI
video-linux 2020.12.03 true PCI
video-modesetting 2020.07.13 true PCI
video-vesa 2017.03.12 true PCI
For some reason
Drivers arent installed
Can you boot to live usb
And give me
mhwd -li
Yeah sure, give me a moment.
Warning: config '/var/lib/mhwd/db/pci/graphic_drivers/hybrid-intel-nvidia-390xx-dkms-bumblebee/MHWDCONFIG' is invalid!
Warning: config '/var/lib/mhwd/db/pci/graphic_drivers/nvidia-390xx-dkms/MHWDCONFIG' is invalid!
Warning: config '/var/lib/mhwd/db/pci/graphic_drivers/hybrid-intel-nvidia-340xx-dkms-bumblebee/MHWDCONFIG' is invalid!
Warning: config '/var/lib/mhwd/db/pci/graphic_drivers/nvidia-340xx-dkms/MHWDCONFIG' is invalid!
Warning: config '/var/lib/mhwd/db/pci/network_drivers/r8168/MHWDCONFIG' is invalid!
Warning: No installed PCI configs!
Warning: No installed USB configs!
Okay
cat /var/log/mhwd-live.log
Running MHWD...
Warning: config '/var/lib/mhwd/db/pci/graphic_drivers/hybrid-intel-nvidia-390xx-dkms-bumblebee/MHWDCONFIG' is invalid!
Warning: config '/var/lib/mhwd/db/pci/graphic_drivers/nvidia-390xx-dkms/MHWDCONFIG' is invalid!
Warning: config '/var/lib/mhwd/db/pci/graphic_drivers/hybrid-intel-nvidia-340xx-dkms-bumblebee/MHWDCONFIG' is invalid!
Warning: config '/var/lib/mhwd/db/pci/graphic_drivers/nvidia-340xx-dkms/MHWDCONFIG' is invalid!
Warning: config '/var/lib/mhwd/db/pci/network_drivers/r8168/MHWDCONFIG' is invalid!
> Using config 'video-optimus-manager' for device: 0000:01:00.0 (0300:10de:1f15) Display controller nVidia Corporation TU106M [GeForce RTX 2060 Mobile]
> Using config 'video-optimus-manager' for device: 0000:05:00.0 (0300:1002:1636) Display controller ATI Technologies Inc Renoir
> Dependencies to install: video-linux
Proceed with installation? [Y/n]
MHWD DONE
Alright, I know the cause of that issue, I'm looking into it right now.
Noch einer hier der mich verstehen kann, sehr schön
Just as an update I installed the TKG dev packages from the repos and now everything works properly (system boots normally), I am installing some games right now to test. So far SW:KOTOR gets stuck in "Preparing to Launch",I'm also downloading Dragonball Z: Kakarot to test I will get back to you in like an hour. 
I tried new .img
liveboot and mhwd installation nvidia drivers on my laptop (dell inspiron 15 7567 - GTX1050-Ti + Intel Core I7 7700HQ) without issue.
That issue is now fixed in this commit. There is still one conflict that librewish will take care of.
Nice! You are awesome guys! If there is a new ISO coming please let us know and I will try it from the beginning.
Just as an ending note after installing TKG dev packages from Chaotic AUR and optimus-manager the system works phenomenally, all games work at high FPS. Thank you so much!