[sane-devel] EPSON Perfection 1640 Users: Please read and respond

[Roy Murphy]

'Twas brillig when Karl Heinz Kremer scrobe:
> I've received three reports so far about problems with the
> EPSON Perfection 1640 scanner. It seems that some models report
> an error when a resolution of 300dpi or more is selected. I've
> also received numerous success stories about this model, so 
> my suspicion is that EPSON changed something in the firmware
> that causes some of these models to do strange things.
> 
> Can you please report back to me (khk at khk.net) if your scanner
> does work with resolutions higher than 300 dpi _AND_ the
> firmware version number your scanner reports.

I've done a little more research on this issue.  I used xscanimage
and received the same error messages scanning above 400dpi in binary
or grey scale.  (Error during read: Invalid Argument)  I *can* scan
up to 720 dpi in 8 bit color mode.  If your successes are only doing
color scans, they may never have this issue.

> This information can be obtained by running the following command:
> cat /proc/bus/usb/devices
> or for SCSI scanners:
> cat /proc/scsi/scsi

[root at eros /root]# cat /proc/bus/usb/devices
T:  Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=12  MxCh= 2
B:  Alloc=  0/900 us ( 0%), #Int=  0, #Iso=  0
D:  Ver= 1.00 Cls=09(hub  ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
P:  Vendor=0000 ProdID=0000 Rev= 0.00
S:  Product=USB UHCI Root Hub
S:  SerialNumber=e000
C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr=  0mA
I:  If#= 0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub
E:  Ad=81(I) Atr=03(Int.) MxPS=   8 Ivl=255ms
T:  Bus=01 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#=  2 Spd=12  MxCh= 0
D:  Ver= 1.10 Cls=ff(vend.) Sub=ff Prot=ff MxPS=64 #Cfgs=  1
P:  Vendor=04b8 ProdID=010a Rev= 1.03
S:  Manufacturer=EPSON
S:  Product=Perfection1640
C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr=  2mA
I:  If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=(none)
E:  Ad=81(I) Atr=02(Bulk) MxPS=  64 Ivl=  0ms
E:  Ad=02(O) Atr=02(Bulk) MxPS=  64 Ivl=  0ms



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