[sane-devel] Epson Perfection 1650

[Karl Heinz Kremer]

This makes sense ... Thansk for digging deep into the scanner
module and figuring this out. Did you try a timeout that's
closer to the 40 seconds, like 60 or 80 seconds? 160 Seconds
sounds pretty long to me and no operation should take that
long until the scaner starts to send data. This timeout is
only for the time between a read operation was started, and
the first data arrives from the scanner (actually until the
first buffer is filled and returned). 

So for now the workaround is to specify the time as module
parameter.

I'll talk to David Nelson (the author of the scanner driver)
about this.

Thanks again,

Karl Heinz

Sergey Smirnov <svs at leaves.ru> said:

> I found that problem in  scanner.c kernel driver.
> I increase NAK value for 1650 in scanner.h:
> #define RD_NAK_TIMEOUT (160*HZ)
> But scanner.c reset this value back to 40*HZ
> ...
> switch (dev->descriptor.idVendor) { /* Scanner specific read timeout 
parameters */
>          case 0x04b8:            /* Seiko/Epson */
>                  scn->rd_nak_timeout = HZ * 40;
> ...
> I have tested 1650 with rd_nak_timeout = HZ * 160.
> I work fine with max resolution 3200.
> Other way compile scanner as module and install it with 
read_timeout=160*100:
> # insmod scanner read_timeout=16000
> 
> Willy Gardiol wrote:
> > Hi!
> > 
> > this is exactly my problem!
> > i think it is a bug in the scanner.o driver because i can perfectly scan 
> > negatives at 1600 dpi under Windows2000 emulated under WMVare (so using 
huci 
> > driver). My kernel is 2.4.17
> > 
> > 
> > On Monday 11 February 2002 12:11, Sergey Smirnov wrote:
> > 
> >>I tried with both drivers:
> >>uhci and usb-uhci.
> >>I use USB Controller: Intel Corp. 82371AB PIIX4 USB (rev 01)
> >>
> >>Karl Heinz Kremer wrote:
> >>
> >>>One more question: What USB host controller are you using (OHCI or UHCI),
> >>>and which driver? There are two for UHCI: uhci and usb-uhci. Somebody
> >>>just reported performance issues with the uhci driver. If this is
> >>>what you are using, you may want to try the other one.
> >>>
> >>>Karl Heinz
> >>>
> >>>On Thu, Feb 07, 2002 at 03:57:09PM +0300, Sergey Smirnov wrote:
> >>>
> >>>>Karl,
> >>>>I'm using Debian unstable with kernel 2.4.18-pre8, sane 1.0.7(epson
> >>>>backend 0.2.19, xsane 0.84
> >>>>I have increased timeout up to 160
> >>>>#define RD_NAK_TIMEOUT (160*HZ)
> >>>>I also tried with SANE_DEBUG_EPSON=64
> >>>>...
> >>>>[epson] receive buf, expected = 4, got = 4
> >>>>[epson] receive buf, expected = 45, got = 45
> >>>>[epson] SANE_START: color: 19
> >>>>[epson] SANE_START: resolution (x, y): (1600, 1600)
> >>>>[epson] SANE_START: area[dots] (x-offset, y-offset), (x-range, y-range):
> >>>>(765, 9900), (1488,
> >>>>2273)
> >>>>[epson] SANE_START: data format: 16
> >>>>[epson] SANE_START: halftone: 0
> >>>>[epson] SANE_START: brightness: 0
> >>>>[epson] SANE_START: gamma: 2
> >>>>[epson] SANE_START: zoom[percentage] (x, y): (100, 100)
> >>>>[epson] SANE_START: color correction: 128
> >>>>[epson] SANE_START: outline emphasis: 0
> >>>>[epson] SANE_START: read mode: 0
> >>>>[epson] SANE_START: mirror image: 0
> >>>>[epson] SANE_START: (new B6 or B7 command ESC s): 0
> >>>>[epson] SANE_START: (new B6 or B7 command ESC t): 128
> >>>>[epson] SANE_START: line counter: 3
> >>>>[epson] SANE_START: extension control: 1
> >>>>[epson] SANE_START: (new B6 or B7 command ESC N): 1
> >>>>[epson] send buf, size = 2
> >>>>[epson] sane_get_parameters()
> >>>>[epson] Preview = 0
> >>>>[epson] Resolution = 1600
> >>>>[epson] get para 0x80fbe80 0x80fc528 tlx 12.143967 tly 157.164154 brx
> >>>>35.803833 bry 193.255493 [mm]
> >>>>[epson] sane_read: begin
> >>>>[epson] sane_read: begin scan1
> >>>>[epson] error in receive - status = 5
> >>>>[epson] receive buf, expected = 6, got = -1
> >>>>...
> >>>>Thank's.
> >>>>
> >>>>
> >>>>>Sergey,
> >>>>>
> >>>>>which Linux distribution are you using? What kernel and
> >>>>>Sane version?
> >>>>>
> >>>>>You probably have some messages on your console about
> >>>>>USB timeouts after this happens. The reason is very likely
> >>>>>that your kernel is too old and does not have the increased
> >>>>>timeout for USB scanner transmissions.
> >>>>>
> >>>>>Please see my page at http://www.khk.net/sane/faq.html for
> >>>>>more information.
> >>>>>
> >>>>>Karl Heinz
> >>>>>
> >>>>>Sergey Smirnov <svs at leaves.ru> said:
> >>>>>
> >>>>>>Hi,
> >>>>>>I have problem with Epson Perfection 1650.
> >>>>>>I can't scan negative film with resolution more than 1200.
> >>>>>>I/o error and only power off reset scanner.
> >>>>>>--
> >>>>>>Sergey Smirnov
> >>>>>>_______________________________________________
> >>>>>>Sane-devel mailing list
> >>>>>>Sane-devel at www.mostang.com
> >>>>>>http://www.mostang.com/mailman/listinfo/sane-devel
> >>>>>>
> >>>>--
> >>>>Sergey Smirnov
> >>>>
> > _______________________________________________
> > Sane-devel mailing list
> > Sane-devel at www.mostang.com
> > http://www.mostang.com/mailman/listinfo/sane-devel
> > 
> -- 
> Sergey Smirnov
> 
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> Sane-devel mailing list
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> 



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