Some CachyOS users and I have encountered issues after updating to the NVIDIA 580.105.08 driver, which seem similar to the problems you described. The core problem appears to be that the graphics card fails to correctly detect the resolution and refresh rate of monitors connected via HDMI.
The issues reported in the forum threads are as follows:
- Inability to set the correct resolution, After updating linux-cachyos-nvidia/linux-cachyos-rc-nvidia/linux-cachyos-lts-nvidia(NVIDIA driver version 580.105.08), the dual-screen display resolution is incorrect - #10 by kentooo - Issues & Assistance - CachyOS Forum and SUddenly missing higher resolution on second monitor - Issues & Assistance - CachyOS Forum
- Inability to set the correct refresh rate, After a nvidia graphic driver change I'm stuck at 60 Hz or lower (both in moniter info and on the pc), I should be able to get 144 Hz - Issues & Assistance - CachyOS Forum
The hardware currently reported with these issues on CachyOS includes the GTX 10xx Series and RTX 20/30/40 Series. In the display settings, the correct resolutions and refresh rates are unavailable, and they cannot be forced using xrandr either. It has been confirmed that this is not a Desktop Environment issue, as the incorrect resolution is noticeable as early as the system boot splash screen. Furthermore, after rolling back to the 580.95 driver version, these issues no longer occur.