Ahem. It now looks like non-pae + wistron doesn’t work either. But this looks more like a configuration issue on my part, I’ll have to investigate it further. It still doesn’t freeze or anything, it’s just that the wireless doesn’t go online.
Luis, there actually was a BIOS upgrade available from Fujitsu , thanks for prompting me to look! I flashed the latest revision S0Z in (it was S0U until now), but unfortunately this didn’t change the behavior at issue here. (There was no mention of the wireless in manufacturer’s changelog either, but those are often incomplete anyway.)