What would (or should) be the effect of
x11-drivers/xf86-video-ati without acpi_video?
acpi_video aside: the driver was, in the past, a source of confusion for me. Sometimes apparently required, sometimes apparently not. Randomness without explanation.
The driver
was installed, when I last shared a probe (which I can't share at the moment, (OT) there's a known issue with bsd-hardware.info). Deleted a few minutes ago, after restarting the OS radeonkms was not automatically loaded, after reinstalling the drive I manually loaded radeonkms then restarted SDDM.
(I omitted to test whether radeonkms would load manually in the absence of the driver. From experience, my guess is that it would not.)
Think bubbles … maybe the randomness predated learning the workaround for <
https://github.com/freebsd/drm-kmod/issues/108> …