[sane-devel] HP ScanJet 4850: Working! but slide mode?

[Daniel Kahn Gillmor]

Hi SANE developers--

I'm pleased to report that the Hewlett/Packard ScanJet 4850 now works
well with libsane 1.0.24-1.1.  It did not work when i tried it with SANE a
year ago, so this is a great step forward.  Below is the output of lsusb
for the device i've been testing on, which is physically branded as an
HP ScanJet 4850.

Also, the model i've got has a slide tray, which is supposed to be able
to be illuminated from the back for scanning transparencies.  I was
unable to get that to work, though, even when choosing the "slide"
source medium from xsane -- it just produced a regular, non-backlit
scan.

Any pointers to what else i should try to enable the use of the slide
scanner?  I'm happy to debug if folks have suggestions.

here's the lsusb output:

Bus 001 Device 002: ID 03f0:1b05 Hewlett-Packard ScanJet 4850C/4890C
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass          255 Vendor Specific Class
  bDeviceSubClass       255 Vendor Specific Subclass
  bDeviceProtocol       255 Vendor Specific Protocol
  bMaxPacketSize0        64
  idVendor           0x03f0 Hewlett-Packard
  idProduct          0x1b05 ScanJet 4850C/4890C
  bcdDevice            1.01
  iManufacturer           1 Hewlett-Packard
  iProduct                2 HP Scanjet Scanner
  iSerial                12 CN579TA15N
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           39
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xc0
      Self Powered
    MaxPower               10mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           3
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0001  1x 1 bytes
        bInterval               8
Device Qualifier (for other device speed):
  bLength                10
  bDescriptorType         6
  bcdUSB               2.00
  bDeviceClass          255 Vendor Specific Class
  bDeviceSubClass       255 Vendor Specific Subclass
  bDeviceProtocol       255 Vendor Specific Protocol
  bMaxPacketSize0        64
  bNumConfigurations      1
Device Status:     0x0001
  Self Powered


Regards,

        --dkg
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