Scsi driver problem

[trinite]

I've got an ASUS P2B-DS dual cpu motherboard. This motherboard has onboard scsi support(Adaptec AIC-7890 Ultra 2). I use the scsi controller for the folowing drives:

• COMPAQPC DDRS-34560W (Direct-Access)
  
• COMPAQ BB00921B91 (Direct-Access)
  
• TOSHIBA CD-ROM XM-6201TA (CD-ROM)
  
• IOMEGA ZIP 100 (Direct-Access)
  
• iomega jaz 2GB (Direct-Access)

I almost never use the CDROM and zip/jazz drives.
For my scsi I use the following (low-level) driver :

• Adaptec AIC7xxx Fast -> U160 support (New Driver)

with the folowing settings:

• (32) Maximum number of TCQ commands per device
  
• (15000) Initial bus reset delay in milli-seconds
  
• [Y] Compile in Debugging Code
  
• (0) Debug code enable mask (2047 for all debugging)
  
• [Y] Decode registers during diagnostics

But from the beginning the system sometimes hangs completely. After a few minutes the system continues to work. But it produces a big error log (part of the log):

[!equilibrium]

same problem here with 2.6.x serie
do not happen with kernel 2.4.x

on my mobo, if i use ACPI support in the 2.6.x kernel, the SCSI errors go away, but the machine shouting down itselt due to a Machine Check Protection.
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Equilibrium's Universe

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[trinite]

I did always use ACPI on this system. And always had the problem with my SCSI drive. So I don't think that the problem is solved by ACPI (At least, not on my system).

[hamletmun]

I couldn't update my gentoo-sources from 2.6.13-r5 to 2.6.14-r2 because of a similiar problem.
Well, never had this kind of problem, maybe the developers applied a wrong patch... I don't know
As my root is the scsi disk attached to Adaptec 29160, I can't even boot.
So I'm just using 2.6.13-r5, waiting for another kernel update.

Latest BIOS of Adaptec 29160 - 30 May 2001
http://download.adaptec.com/eprom_bios/29160_bios_3100.exe

Latest kernel patch - 22 May 2004 (by Justin T. Gibbs)
http://people.freebsd.org/~gibbs/linux/

[trinite]

Strange, I've had never problems with booting my system.. only if I stress my system it sometimes generates that error.... And I'm beginning to think that the problem is my First SCSI disk, but I don't know that for sure..

Is there maybe anyone who can tell what is causing this error (or at least explaining te errorlog?)