I downloaded the CachyOS installer image, put it on a USB key and booted from it. On the login screen I had to switch to Wayland as described here:
I then proceeded to install CachyOS. I selected XFCE as desktop environment (instead if the default KDE Plasma). I selected to use the entire hard disk (i.e. clean install).
On the first reboot after installation, no graphical login came up. I could log in via the text consoles. Lightdm was not running. Enabling it with systemctl did not help.
I then reinstalled from scratch, selecting the default KDE Plasma this time, which works.
Does CachyOS not support XFCE directly from the installer?
you have install, it seems that X.org don t launch properly or not enought configuration. i suddget to resintall, and event if you haven t X11, in tty, check as my message before to understand why
I looked into /var/log/Xorg.0.log
The problem seems to be that the setup is likely not compatible with the system’s graphics hardware, an admittedly very old ATI/AMD RV370 (X600) graphics card.
The hardware including the monitor and its resultion (1080p) are correctly identified.
According to the X11 log, the following modules are tried to be loaded, but not found:
ati, fbdev, vesa
Then the glamor module is loaded.
It ends up with
(WW) glamor requires at least 128 instructions (64 reported)
So it seems that this module requires more potent hardware. Apparently the CachyOS installer is not able to properly deal with such old hardware, at least not for X11.