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On Fri, Mar 30, 2001 at 12:02:19PM -0500, Jonathan Fuerth wrote:
> It's an Adaptec 2940UW SCSI<->PCI host adapter.  My AtlasIV is the
> internal scsi ultra wide model.
> 
> I have two flawlessly functioning CD-ROM drives on the same scsi bus,
> and the setup that wedges 1.5 boots fine and works great under 1.4.2.
> The host adapter is set to automatic termination, and the last cdrom
> on the narrow end of the bus has termination on, as does the atlas4
> (being the only device on the wide end of the bus).
> 
> I posted this to gnats (kern/11346) when 1.5_BETA was out.. but never
> heard from anyone about the issue.  The symptoms haven't changed under
> the formal 1.5 release.

This may have something to do with tagged queuing. Could you try to
disable tagged queuing ? The attached patch should do it.

--
Manuel Bouyer <bouyer@antioche.eu.org>
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--- aic7xxx.c.old	Sat Mar 31 17:04:24 2001
+++ aic7xxx.c	Sat Mar 31 17:04:51 2001
@@ -5651,6 +5651,7 @@
 	if (tstate->tagdisable & devinfo.target_mask)
 		return;
 
+#if 0
 	/*
 	 * Sneak a look at the results of the SCSI Inquiry
 	 * command and see if we can do Tagged queing.  This
@@ -5679,6 +5680,7 @@
 			xs->sc_link->openings = 4;
 		}
 	}
+#endif
 }
 
 static int

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