[sane-devel] S..L..O..W USB Scanning with Epson 1650

[Justin S. Peavey]

On Thu, Nov 15, 2001 at 06:43:06PM -0500, Karl Heinz Kremer wrote to To Justin S. Peavey:
> Can you please give some examples of scan times with information
> about the size and the resolution of the scans.
> 
> Do you get any messages on the console that are related to the USB
> system?
> 
> Karl Heinz

A typical 300dpi scan of a 4x6 color picture takes about 20 seconds
running under Windows, and about 7-10 minutes under Linux.  A 1200 DPI
scan takes about 5-7 minutes under Windows, and over 2 hours under
linux (not quite sure, I killed it at two hours).  

I've tried both the uhci and usb-uhci modules without any noticeable
change, and there are no USB messages on console except normal scanner
detection (following)

Nov 15 17:52:48 stout kernel: hub.c: USB hub found
Nov 15 17:52:48 stout kernel: hub.c: 2 ports detected
Nov 15 17:52:48 stout kernel: hub.c: USB new device connect on bus1/2,
assigned device number 2
Nov 15 17:52:50 stout kernel: usb.c: USB device 2 (vend/prod
0x4b8/0x110) is not claimed by any active driver.
Nov 15 17:53:05 stout kernel: usb.c: registered new driver usbscanner
Nov 15 17:53:05 stout kernel: scanner.c: probe_scanner: User specified
USB scanner -- Vendor:Product - 4b8:110
Nov 15 17:53:05 stout kernel: devfs: devfs_register(): device already
registered: "scanner0"
Nov 15 17:53:05 stout kernel: scanner.c: 0.4.6:USB Scanner Driver

-J