Hi there!
I installed CachyOs a few weeks ago, and it worked fine until now, I was able to work, play on steam, etc. Last time I used my computer was Wednesday, I don’t remember doing any update. When I came back from work on Thursday, CachyOs wouldn’t boot (black screen). After a bit of investigating, I booted with ‘nomodeset’, updated everything, but didn’t fix the issue. amdgpu.dc=0 also don’t work, I freeze after a few seconds on the passphrase prompt for the LUKS, and black screen once again.
Booting with nomodeset works, But i have no second screen and no GPU acceleration apparently.

I’m fairly new to linux too, just switched on it a few month back

here some relevant infos:

https://paste.cachyos.org/2df4828.log

OS: CachyOS x86_64
Host: X570 AORUS ULTRA (-CF)
Kernel: Linux 7.0.9-1-cachyos

Display (Unknown-1): 2560x1440 in 31", 60 Hz
DE: KDE Plasma 6.6.5
WM: KWin (Wayland)
WM Theme: Orchis

CPU: AMD Ryzen 9 5900X (24) @ 4.95 GHz
GPU: AMD Radeon RX 9070 XT
Memory: 4.64 GiB / 31.28 GiB (15%)
Swap: 0 B / 31.28 GiB (0%)
Disk (/): 491.29 GiB / 927.50 GiB (53%) - btrfs

if cahys -RC, then

When you boot, selct by e and edit :

Options root=UUID=yourUUIDIDdontchange

rw rootflags=subvol=/@ zswap.enabled=0 nowatchdog splash linux /vmlinuz-linux-cachyos-rc initrd /initramfs-linux-cachyos-rc.img

you have this error on boot
[ 4.920476] amdgpu 0000:0b:00.0: probe with driver amdgpu failed with error -22]

also think to update your UEFI motherboard ( recheck catrefully version x.x motherboard)
https://www.gigabyte.com/Motherboard/X570-AORUS-ULTRA-rev-10/support#Support-Bios