[sane-devel] Mac OS X - xsane and Microtek Scanmaker II

[abel deuring]

David B Brown wrote:
> 
> Hi,
> 
> new to sane so bear with me.
> 
> I installed version 1.0.12 via Fink. I'm using xsane 0.89 as my front
> end, but have also tried just using scanimage from the command line
> with the same symptoms. I'm running Mac OS X 10.2.6, with a 
> Scanmaker II attached to and Adaptec 2906 SCSI card. The scanner
> works ok if slowly with VueScanX, so I guess that basically the
> SCSI bus and the Scanner are working ok.
> 
> The symptoms are similar to those discussed between June 10th and
> June 19th 2003 under the thread heading FreeBSD and Microtek Scanmaker
> II, in that if I try to scan in color it fails after the first pass,
> although if I scan in grayscale it works ok (single pass).

I don't think that the problems are similar. The FreeBSD/CAM part of
sanei_scsi.c (that's Sane's internal library for OS-independent SCSI
device access) had a bug in it's SCSI command error handling, while the
"Unexpected bus free" messages you see with MacOS X indicate a low-level
SCSI protocol problem. 

These old Microtek scanners don't have the best SCSI protocol
implementation (for example, they respond to some SCSI commands on all
LUNs, formally suggesting that you have actually 8 scanners
installed...), so I would guess that the adapter driver and the scanner
are to be blamed. But it might be possible to "configure" the access to
a certain SCSI device (selection of transfer speed, disabling
disconnect...) somehow with the MacOS SCSI drivers. The people who wrote
the MacOS part of sanei_scsi.c might have better comments.

> 
> Looking in /var/log/system.log I can see the following
> 
> [G4:~] dave% more /var/log/system.log | grep Adaptec
> Aug 28 20:12:30 G4 mach_kernel: Adaptec warning: Unexpected bus free
> Aug 28 20:14:21 G4 mach_kernel: Adaptec warning: Unexpected bus free
> Aug 28 20:22:44 G4 mach_kernel: Adaptec warning: Unexpected bus free
> Aug 28 20:24:37 G4 mach_kernel: Adaptec warning: Unexpected bus free
> Aug 28 20:25:38 G4 mach_kernel: Adaptec warning: Unexpected bus free
> Aug 28 20:27:29 G4 mach_kernel: Adaptec warning: Unexpected bus free
> Aug 28 20:32:05 G4 mach_kernel: Adaptec warning: Unexpected bus free
> Aug 28 20:33:57 G4 mach_kernel: Adaptec warning: Unexpected bus free
> Aug 28 20:35:32 G4 mach_kernel: Adaptec warning: Unexpected bus free
> Aug 28 20:37:23 G4 mach_kernel: Adaptec warning: Unexpected bus free
> Aug 28 20:58:23 G4 mach_kernel: Adaptec warning: Unexpected bus free
> Aug 28 20:59:30 G4 mach_kernel: Adaptec error: PAL_bit_bucket: not in data phase?
> Aug 28 20:59:30 G4 mach_kernel: Adaptec CARD DISABLED because of unrecoverable error!
> Aug 28 20:59:30 G4 mach_kernel: Adaptec warning: Resetting SCSI bus.
> Aug 28 20:59:35 G4 mach_kernel: Adaptec warning: Resetting SCSI bus.
> Aug 28 22:25:32 G4 mach_kernel: Adaptec warning: Unexpected bus free
> Aug 28 22:26:14 G4 mach_kernel: Adaptec error: PAL_bit_bucket: not in data phase?
> Aug 28 22:26:14 G4 mach_kernel: Adaptec CARD DISABLED because of unrecoverable error!
> Aug 28 22:26:14 G4 mach_kernel: Adaptec warning: Resetting SCSI bus.
> Aug 28 22:26:20 G4 mach_kernel: Adaptec warning: Resetting SCSI bus.
> 
> Is it possible that this is the same problem?
> 
> Is it possible that since I installed via fink, I don't necessarily have the patch that is referred to in the discussion mentioned above ?
> If so how would i go about installing the patch ?
> 
> Is there some command I can use to provide more trace to help diagnose the problem ?

Running the Sane frontend with the environemnt variables
SANE_DEBUG_MICROTEK=255 and SANE_DEBUG_SANEI_SCSI=255 might perhaps give
a bit more insight, where the problem occurs. But again, I think that
the authors of the MacOS X part of sanei_scsi.c probably have better
suggestions.

Abel