Bug 206428

/etc/sane.d/epson does not exist, I asume you mean /etc/sane.d/epson.conf
Which USB IDs are known to a driver depends on which models are known
by the author of the driver to work correctly with the driver.
For any USB scanner not known to the backend (yet), you may, at your
own peril(!), force the backend to recognise it.

I will forward your information to the author of the "epson" driver.

I close this report as "wontfix" because there is nothing we can do
(the author must decide and if it's o.k. he will add it to his driver).

See the "epson backend for the Stylus CX4800" thread
on sane-devel@lists.alioth.debian.org:
http://lists.alioth.debian.org/pipermail/sane-devel/2006-September/thread.html
in particular see
http://lists.alioth.debian.org/pipermail/sane-devel/2006-September/017763.html
-------------------------------------------------------------------------------
> a user reported to us that the Epson Stylus CX4800 (0x4b8/0x419)
Unless there is yet another USB product ID I've never heard of, I
think that should be 0x4b8/0x819.
-------------------------------------------------------------------------------

Justin,
to clarify about the IDs, provide the output of
sane-find-scanner -q
and the output of
lsusb -v

I think I meant to type 0x819 and mistyped it XD. Sorry about that.

Here's the results anyway:

Sane Find Scanner:
found USB scanner (vendor=0x04b8 [EPSON], product=0x0819 [USB2.0 MFP(Hi-Speed)]) at libusb:001:004

lsusb:
Bus 001 Device 004: ID 04b8:0819 Seiko Epson Corp. 
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  idVendor           0x04b8 Seiko Epson Corp.
  idProduct          0x0819 
  bcdDevice            1.00
  iManufacturer           1 EPSON
  iProduct                2 USB2.0 MFP(Hi-Speed)
  iSerial                 3 L40020508010658220
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           78
    bNumInterfaces          3
    bConfigurationValue     1
    iConfiguration          4 USB2.0 MFP(Hi-Speed)
    bmAttributes         0xc0
      Self Powered
    MaxPower                2mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              5 EPSON Scanner
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x01  EP 1 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         7 Printer
      bInterfaceSubClass      1 Printer
      bInterfaceProtocol      2 Bidirectional
      iInterface              6 USB2.0 Printer
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x04  EP 4 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x85  EP 5 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         8 Mass Storage
      bInterfaceSubClass      6 SCSI
      bInterfaceProtocol     80 Bulk (Zip)
      iInterface              7 USB2.0 Mass Storage
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x07  EP 7 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x88  EP 8 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
Device Qualifier (for other device speed):
  bLength                10
  bDescriptorType         6
  bcdUSB               2.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  bNumConfigurations      1
Device Status:     0x0001
  Self Powered

Thanks for the info.
I forwarded it to the driver author.