Main problem with Mupdf is the lack of table of contents.
So either the battery is dead, or it's the graphics card that died, or something else.
Or I undid a vital wire/ribbon that I forgot about and didn't reconnect.
The poorly named qpdfview has fewer dependencies than Okular (is only Qt instead of KDE), but depends on Cups, which I'll need to recompile to remove Avahi crap.
I disconnected the graphics and RAM, but neither had any effect on behaviour.
Trying to get anywhere with the supposed replacement machine is roadblock after roadblock, with a few brick walls and dead-ends thrown in.
Everything sucks. Anything that seems good is a lie or a temporary illusion.
:(