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I'm running Ubuntu 9.10 Server edition on my DQ45CB board. I upgraded to BIOS revision 1.11 just now, and found it caused everything to run at a REAAAAALY slow pace. Every operation, I/O or memory or processor, ran at about 1/8th speed of normal. I don't know how a BIOS update could have caused this, but that's what happened. Even the BIOS boot time itself seem to take longer, not just the OS boot time. From my days as a systems engineer, I might attribute such behavior to a flood of hardware-level interrupts, though dmesg and syslogs, etc. showed no such interrupts, so it was confusing to me.
When I back-rev'ed to 1.09, everything worked perfectly.
Anybody else had this situation? I can't figure out what might have caused it to happen. I didn't see anything obvious in the logs, and I ran memtest86+ under 1.11 and saw no problems, as well.