Re: no /dev entry for printer when it is out of ink

[Mike <mike@kordik.net>]

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Thanks for the help!

The rule I wrote is supposed to create /dev/printers/EPC80. It was 
creating this directory, up until recently.

udevmonitor output:
UEVENT[1132621451.657266] 
add@/devices/pci0000:00/0000:00:02.1/usb2/2-1/2-1.3
UEVENT[1132621451.661395] 
add@/devices/pci0000:00/0000:00:02.1/usb2/2-1/2-1.3/2-1.3:1.0
UEVENT[1132621451.669255] add@/class/usb/lp0
UDEV  [1132621454.756357] 
add@/devices/pci0000:00/0000:00:02.1/usb2/2-1/2-1.3
UDEV  [1132621456.822296] add@/class/usb/lp0
UDEV  [1132621458.547985] 
add@/devices/pci0000:00/0000:00:02.1/usb2/2-1/2-1.3/2-1.3:1.0

dmesg:
usb 2-1.3: new full speed USB device using ohci_hcd and address 18
drivers/usb/class/usblp.c: usblp0: USB Bidirectional printer dev 18 if 0 
alt 0 proto 2 vid 0x04B8 pid 0x0005


lsusb -v:
Bus 002 Device 018: ID 04b8:0005 Seiko Epson Corp. Stylus Printer
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0
  bDeviceProtocol         0
  bMaxPacketSize0         8
  idVendor           0x04b8 Seiko Epson Corp.
  idProduct          0x0005 Stylus Printer
  bcdDevice            1.00
  iManufacturer           1 EPSON
  iProduct                2 USB Printer
  iSerial                 3 0HSLL0108041158030
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           32
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0
    bmAttributes         0xc0
      Self Powered
    MaxPower                2mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         7 Printer
      bInterfaceSubClass      1 Printer
      bInterfaceProtocol      2 Bidirectional
      iInterface              0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x01  EP 1 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               none
        wMaxPacketSize         64
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               none
        wMaxPacketSize         64
        bInterval               0
  Language IDs: (length=4)
     0409 English(US)

I understand what you are saying about udev not communicating with the 
printer. It appears to me that the kernel is telling udev that the 
printer is connected but why isn't udev creating the device directory entry?

Thanks

Mike

Kay Sievers wrote:

>On Mon, Nov 21, 2005 at 07:54:50AM -0500, Mike wrote:
>  
>
>>My printer has been working fine but now udev won't create a /dev entry 
>>for it. I have used usbview, udevinfo, I have looked in the logs. 
>>Everything says the printer is connected. The only thing I can think of 
>>is that the printer is returning some sort of status to udev and it 
>>decides not to create the node. I have a 4 color printer and I need the 
>>/dev entry so escputil can connect and tell me which ink needs to be 
>>replaced.
>>
>>Assuming that this is a problem with udev not creating the node because 
>>it is getting an error from the printer, I could solve this by replacing 
>>all the inks.
>>
>>The log doesn't have any udev messages to tell me it is not creating the 
>>node yet there is no /dev entry. I have debug, in udev.conf, set to yes.
>>    
>>
>
>Udev does not care or ask the printer anything, it just reflects the
>kernel's state.
>
>What device node name do you expect to appear?
>
>What does "udevmonitor" print, while connecting the printer?
>
>What does "dmesg" tell about the printer after it was connected?
>
>What does "lsusb -v" tell about the printer?
>
>Kay
>
>
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