Comment 2 for bug 788631

I've attached a text file with the results, the problem is the 1022n, the rest are just switched off but work ok. The printer was locked up but connected when I ran hp-check -t but when I cycle the power to the printer again and run hp-check -t it comes back up as you can see here.

HP_LaserJet_1022n
-----------------
Type: Printer
Device URI: hp:/net/HP_LaserJet_1022n?ip=131.227.76.106
PPD: /etc/cups/ppd/HP_LaserJet_1022n.ppd
PPD Description: HP LaserJet 1022n zjs, hpcups 3.11.3a, requires proprietary plugin
Printer status: printer HP_LaserJet_1022n disabled since Thu 26 May 2011 15:29:23 B/usr/libexec/cups/backend/hp failed
warning: Optional plug-in status: Not installed
Communication status: Good

Is the propriety plugin essential? What exactly does it do?