usb-parallelport adapter: Discarding unused printer-state-changed event...

[ekkard gerlach]

CUPS 1.2.7 on Suse 10.2 has problems with a normal usb-parallelport 
adapter:
D [13/Mar/2006:04:51:27 +0100] Discarding unused printer-state-changed 
event...

No other errors are found in err_log. Printer is enabled, echo hello > 
/dev/usb/lp0  works fine.

lpstat -t
[...]
printer usb-drucker now printing usb-drucker-10.  enabled since Tue Jul 
15 13:06:02 2008
         Printer not connected; will retry in 30 seconds...

# lpc status
usb-printer:
         printer is on device 'usb' speed -1
         queuing is enabled
         printing is enabled
         3 entries
         daemon present

# lsusb
Bus 002 Device 002: ID 067b:2305 Prolific Technology, Inc. PL2305 
Parallel Port
Bus 002 Device 001: ID 0000:0000
Bus 001 Device 001: ID 0000:0000

# lsusb -v

Bus 002 Device 002: ID 067b:2305 Prolific Technology, Inc. PL2305 
Parallel Port
Device Descriptor:
   bLength                18
   bDescriptorType         1
   bcdUSB               1.00
   bDeviceClass            0 (Defined at Interface level)
   bDeviceSubClass         0
   bDeviceProtocol         0
   bMaxPacketSize0         8
   idVendor           0x067b Prolific Technology, Inc.
   idProduct          0x2305 PL2305 Parallel Port
   bcdDevice            2.02
   iManufacturer           1 Prolific Technology Inc.
   iProduct                2 IEEE-1284 Controller
   iSerial                 0
   bNumConfigurations      1
   Configuration Descriptor:
     bLength                 9
     bDescriptorType         2
     wTotalLength           78
     bNumInterfaces          1
     bConfigurationValue     1
     iConfiguration          0
     bmAttributes         0x80
       (Bus Powered)
     MaxPower              100mA
     Interface Descriptor:
       bLength                 9
       bDescriptorType         4
[...]

The error message "Discarding unused printer-state-changed.."  leads 
with google to Ubunto-Problems with udev-rules:
http://forum.ubuntuusers.de/topic/78721/
I tried a similar hack in Suse udev-rules (replace ATTRS with SYSFS) but 
it didn't help.

thx
Ekkard