After updating to the latest rawhide yesterday my printer stopped working.
Downgrading to hplip + hpijs + libsane-hpaio from F-7 updates, fixes this.
I've also tried to change the DeviceURI from:
As a new "dynamic" printer was added to my cups config using this as DeviceURI,
but that didn't help either.
My printer is a HP PSC 1350 connected through USB, with the rawhide hplip+hpijs,
hp-toolbox still saw the printer fine if run as root, but printing didn't work,
ps aux revealed hanging (sleeping) hpijs and ghostscript processes.
I will happily do more testing, I like the idea of getting rid if the hplip
daemons, but sofar that doesn't seem to work for me.
This is caused by udev not making /dev/bus/usb nodes as far as I can tell.
I can confirm that hplip-2.7.6-9.fc8 fixes this, closing.