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Subject: WRITE command timeout
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I've been having some trouble with nforce motherboard and 
FreeBSD-5.2.1-CURRENT as well.  The only combinations that I have found 
to work consistently are disabling ACPI  with hw.acpi.0.disabled="1" and 
either no PM or using apm, or enabling ACPI and APIC disabled with 
hw.apic.0.disabled="1".  This solution would not work for SMP kernel. 
    I'm not sure of the exact problem but there seems to be an irq 
sharing issue when both ACPI and APIC are enabled.  These coexisted with 
11/2003 5.1 but as of 5.2.1 there have been problems for me.  Onbord 
Lan, USB, and either ACPI or APIC cannot coexist.
    There was also an issue with using multiple drives per 
ide-controller.  No problem with a drive per controller, but add optical 
drive and hard-drive on same controller and all I got was fs corruption 
and r/w timeouts.  BIOS upgrade improved r/w timeouts, so that it took 
less time to find out data was corrupted.