I can reproduce the problem now, but not with print queue which got
created by hal-cups-utils or system-confiog-printer.

I have the HP PhotoSmart C8100:

t...@till-laptop:~/ghostscript/gpl/testfiles$ /usr/lib/cups/backend/usb 
2>/dev/null
direct usb://HP/Photosmart%20C8100%20series?serial=MY7B5F70P704YH&interface=1 
"HP Photosmart C8100 series" "HP Photosmart C8100 series" 
"MFG:HP;MDL:Photosmart C8100 
series;CMD:MLC,PCL,PML,DW-PCL,DESKJET,DYN;1284.4DL:4d,4e,1;CLS:PRINTER;DES:L2526;SN:MY7B5F70P704YH;S:038088C4840010210078cb0000041b8001b46b8002b47b8006444b8006448b8005a45b80038;Z:0102,05000009016a81013241013241013241013241013241,0600,070000000000000000000000000000,0b000000000000000097ce97e9000097e99804000097ea981a000097e89812000097e99811000097e99809,0c0;"
 ""

Now I do not take the device URI reported by the backend in discovery
mode (no arguments) but intendedly mistype it when creating a queue (in
the example I clone the PPD file from my auto-created working queue for
the printer):

t...@till-laptop:~/ghostscript/gpl/testfiles$ lpadmin -p test -v
usb://HP/Photosmart_C8100_series?serial=MY7B5F70P704YH -E -P
/etc/cups/ppd/Photosmart_C8100_series.ppd

lpadmin exits without errors (it should give an error for the invalid
URI) and creates the queue. If I print into this queue I get exactly the
behavior as reported here.

This gives me the impression that hal-cups-utils "mistypes" USB URIs in
certain cases.

So, Steve Beattie, to see whether the problem is really as you and me
assumed, please post the printer URI which you get by Plug'n'Print and
which does not work and the URI which you get for a queue created with
system-config-printer via the "New" button. Use system-config-printer or
"lpstat -v" to display the URIs of your print queues.


** Package changed: cups (Ubuntu Jaunty) => hal-cups-utils (Ubuntu Jaunty)

-- 
Printer (HWModel Name) May Not Be Connected
https://bugs.launchpad.net/bugs/348316
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