On Mon, 5 Jun 2006, Lev A. Melnikovsky wrote: > I'm (also) having problems with my dc395x and HP C6270A scanner. The log > contains multiple "Unexpected reselection" messages, so I assume this has > something to do with the earlier report. Sorry, if my assumption is wrong. I'm afraid your assumption is correct:-) > I'm using [x]sane[d] (FC5 official rpm) to control the scanner. The problem is > ~50% reproducible. Sometimes the scanning is successful, but sometimes it > hangs for several minutes and reports and I/O Error (earlier sane versions > segfaulted here, but the modern one does not). > > I have tried the patch from > http://marc.theaimsgroup.com/?l=linux-scsi&m=114400790021967&w=2 > but it did not really change anything observable. Same as with other 2 (I think) reporters. > The log (scsi_mod scsi_logging_level=15) follows: Well, 15 is a little too small. As you've probably seen in drivers/scsi/scsi_logging.h logging is a bitfield with 3 bits allocated for every event-type (error, timer, etc.). Actually, if you have no other SCSI devices in the system (including USB storage), I would try raising it to the maximum ((1 << 30) - 1). The goal would be to try to see which command exactly leads to unexpected reselect. Apart from that I have little idea on how to debug it. If the log gets too big to be sent to the list, please upload it somewhere and provide a link. > This scanner is the only device on the bus. My understanding is that I don't > need to manually terminate anything, please correct me if I'm wrong. I can not The bus has to be terminated on both ends. The HBA is, probably, terminating automatically, but the external end has to be terminated. Either with an external terminator or with a switch / jumper on your scanner. > guarantee that this is not a hardware problem, but, as far as I remember, it > did not show (this often) under 2.4 kernel (with the same hardware setup). But it did show sometimes? On the same hardware? > My configuration follows: > > Linux 2.6.16.19 #9 Sun Jun 4 22:30:07 MSD 2006 i686 i686 i386 GNU/Linux > > $ cat /proc/cpuinfo > > processor : 0 > vendor_id : GenuineIntel > cpu family : 6 > model : 11 > model name : Intel(R) Celeron(TM) CPU 1300MHz > stepping : 1 > cpu MHz : 1303.107 > cache size : 256 KB > fdiv_bug : no > hlt_bug : no > f00f_bug : no > coma_bug : no > fpu : yes > fpu_exception : yes > cpuid level : 2 > wp : yes > flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat > pse36 mmx fxsr sse > bogomips : 2608.88 > > $ free > total used free shared buffers cached > Mem: 256164 242876 13288 0 13456 176828 > -/+ buffers/cache: 52592 203572 > Swap: 530136 0 530136 Which confirms that this problem is not 64 bit or highmem specific. Thanks Guennadi --- Guennadi Liakhovetski - : send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
