Latest Pacman Updates Break SDDM

[BS86]

it is actually intel:

Update issues with mesa and xf86-video-intel

Several people have reported that the latest release of mesa causes issues when you are using intel graphics and have xf86-video-intel installed. xf86-video-intel is only needed for very old Intel hardware (15+ years old). In most cases, you can remove xf86-video-intel to resolve the issue. If you have very old hardware, the modesetting driver is supported on Gen4 or newer hardware. You can see the list of generations here: