Hello,
I have what appears to be a USB problem with my Epson scanner after
switching from the scanner.o module to libusb. I posted this to the
SANE list about a week ago, but nobody had any ideas. Indications are
that maybe this is a USB problem, so I'm hoping someone here can point
me in the right direction.
Epson 636U scanner fails with I/O error messages (USBDEVFS_BULK failed)
when configured using libusb, 2.6.3, sane backends (libsane) 1.0.13,
and hotplug. System is Debian testing/unstable. This scanner has worked
perfectly for over two years using the scanner.o driver with both 2.4.x
and 2.6.x kernels. Moving from 2.6.2 to 2.6.3 I was forced to
reconfigure using libusb, since scanner.o is removed from the kernel
configuration. I've read all the docs I can find, and feel reasonably
sure that my configuration correct.
The scanner is being found by sane-find-scanner and by scanimage -L
(1st try only). Once a frontend (scanimage or xsane) has tried to
access the scanner once, it hangs, and will not find the scanner again.
Even though the scanner is found by scanimage or xsane on the first
try, it won't operate at all. I've commented out all unused scanner
lines in /etc/sane.d/dll.conf and verified that permissions are being
set correctly. The problem occurs both as root and as a user member of
the scanner group. Hopefully the output below will give some clues as
to what's happening.
Thank You,
Scott Miller
sane-find-scanner
# No SCSI scanners found. If you expected something different, make
sure that
# you have loaded a SCSI driver for your SCSI adapter.
found USB scanner (vendor=0x04b8 [EPSON], product=0x0101
[Perfection636]) at libusb:001:002
# Your USB scanner was (probably) detected. It may or may not be
supported by
# SANE. Try scanimage -L and read the backend's manpage.
# Scanners connected to the parallel port or other proprietary ports
can't be
# detected by this program.
# You may want to run this program as root to find all devices. Once
you
# found the scanner devices, be sure to adjust access permissions as
# necessary.
scanimage -L (1st time after boot or after power cycling scanner)
device `epson:libusb:001:002' is a Epson Perfection636 flatbed scanner
(response time is almost immediate)
scanimage -L (2nd time)
device `epson:libusb:001:002' is a Epson Perfection636 flatbed scanner
(response time is very slow -- 30 seconds)
scanimage -L (3rd time)
No scanners were identified. If you were expecting something different,
check that the scanner is plugged in, turned on and detected by the
sane-find-scanner tool (if appropriate). Please read the documentation
which came with this software (README, FAQ, manpages).
(response time again is very slow)
dmesg (after scanimage -L fails)
usb 1-1: bulk timeout on ep1in
usbfs: USBDEVFS_BULK failed dev 2 ep 0x81 len 1 ret -110
ls -l /proc/bus/usb/001
total 0
-rw-r--r-- 1 root root 43 Feb 20 12:23 001
-rw-rw---- 1 root scanner 50 Feb 20 12:26 002
-rw-r--r-- 1 root root 43 Feb 20 12:23 003
-rw-r--r-- 1 root root 50 Feb 20 12:23 004
lsusb -v
Bus 002 Device 001: ID 0000:0000
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 9 Hub
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x0000
idProduct 0x0000
bcdDevice 2.06
iManufacturer 3
iProduct 2
iSerial 1
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 25
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x40
Self Powered
MaxPower 0mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0002 bytes 2 twice
bInterval 255
Bus 001 Device 004: ID 0781:0002 SanDisk Corp. SDDR-31 ImageMate II
CompactFlash Reader
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x0781 SanDisk Corp.
idProduct 0x0002 SDDR-31 ImageMate II CompactFlash Reader
bcdDevice 0.09
iManufacturer 1
iProduct 3
iSerial 2
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 32
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x40
Self Powered
MaxPower 100mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 8 Mass Storage
bInterfaceSubClass 6 SCSI
bInterfaceProtocol 80 Bulk (Zip)
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 bytes 64 once
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 bytes 64 once
bInterval 0
Bus 001 Device 003: ID 050f:0003 KC Technology, Inc. KC82C160S Hub
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 9 Hub
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x050f KC Technology, Inc.
idProduct 0x0003 KC82C160S Hub
bcdDevice 1.00
iManufacturer 0
iProduct 0
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 25
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xe0
Self Powered
Remote Wakeup
MaxPower 100mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0001 bytes 1 once
bInterval 255
Bus 001 Device 002: ID 04b8:0101 Seiko Epson Corp. Perfection 636
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.00
bDeviceClass 255 Vendor Specific Class
bDeviceSubClass 255 Vendor Specific Subclass
bDeviceProtocol 255 Vendor Specific Protocol
bMaxPacketSize0 64
idVendor 0x04b8 Seiko Epson Corp.
idProduct 0x0101 Perfection 636
bcdDevice 1.04
iManufacturer 1 EPSON
iProduct 2 Perfection636
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 32
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x40
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 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 bytes 64 once
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 bytes 64 once
bInterval 0
Bus 001 Device 001: ID 0000:0000
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 9 Hub
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x0000
idProduct 0x0000
bcdDevice 2.06
iManufacturer 3
iProduct 2
iSerial 1
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 25
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x40
Self Powered
MaxPower 0mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0002 bytes 2 twice
bInterval 255
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