Some searching and some trial and error later I find that adding a "reboot=p" 
to the kernel command line will result in en rebootable system. It looks like 
this system ("HP t640 Thin Client") should be added to the list of boot quirks 
in 'arch/x86/kernel/reboot.c'?

For the record, "c,p", "g,p" and "p" work, all other combinations fail to do a 
functional reboot.

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