I'll update to ALPHA2.
In the meantime, briefly: <https://photos.app.goo.gl/jcXxDuxWPyXTa59Z8>
– no visible progress beyond the four lines of EFI framebuffer information.
In each case, I worked around by removing a USB flash drive that's used
for L2ARC.
The most recent incident was preceded by a power button shutdown, in
response to a drm-510-kmod blackout (GPU lockup etc.) whilst typing in
Firefox (comparable to <https://github.com/freebsd/drm-kmod/issues/239>
for drm-515-kmod 5.15.25).
The prior incident was also preceded by a power button shutdown (in
response to a blackout at Plasma log out time). This was remarkable in
that there was an unexpected restart, when I expected the computer to
power off.
