amd64/95554: undetected sata drive on 6.1, detected on 6.0

[Jeff]

>Number:         95554
>Category:       amd64
>Synopsis:       undetected sata drive on 6.1, detected on 6.0
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-amd64
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Apr 09 19:30:19 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator:     Jeff
>Release:        6.1-RC
>Organization:
>Environment:
FreeBSD shaw 6.1-RC FreeBSD 6.1-RC #1: Sat Apr  8 21:13:38 UTC 2006     root at shaw:/usr/obj/usr/src/sys/GENERIC  amd64
>Description:
Motherboard: A8N-VM CSM
http://www.asus.com/products.aspx?l1=3&l2=15&l3=210&model=766&modelmenu=1

When running 6.0, all 3 sata drives are detected... As soon as 6.1 boots, 1 drive is missing.

6.0's messages :

<snip> 
Apr  5 12:00:22 shaw kernel: Timecounter "TSC" frequency 1808240973 Hz quality 800
Apr  5 12:00:22 shaw kernel: Timecounters tick every 1.000 msec
Apr  5 12:00:22 shaw kernel: ad4: 286168MB <Seagate ST3300622AS 3.AAE> at ata2-master UDMA33
Apr  5 12:00:22 shaw kernel: ad6: 286168MB <Seagate ST3300831AS 3.01> at ata3-master UDMA33
Apr  5 12:00:22 shaw kernel: ad8: 286167MB <Seagate ST3300831AS 3.03> at ata4-master UDMA33
Apr  5 12:00:22 shaw kernel: ukbd0: CHESEN USB Keyboard, rev 1.10/1.10, addr 2, iclass 3/1
Apr  5 12:00:22 shaw kernel: kbd0 at ukbd0
Apr  5 12:00:22 shaw kernel: uhid0: CHESEN USB Keyboard, rev 1.10/1.10, addr 2, iclass 3/1
Apr  5 12:00:22 shaw kernel: Trying to mount root from ufs:/dev/ad4s1a
</snip>

6.1 messages:
<snip>
Apr  8 18:33:12 shaw kernel: Timecounter "TSC" frequency 1808239360 Hz quality 800
Apr  8 18:33:12 shaw kernel: Timecounters tick every 1.000 msec
Apr  8 18:33:12 shaw kernel: module_register_init: MOD_LOAD (amr_linux, 0xffffffff805f64a0, 0) error 6
Apr  8 18:33:12 shaw kernel: ad4: 286168MB <Seagate ST3300622AS 3.AAE> at ata2-master SATA300
Apr  8 18:33:12 shaw kernel: ad8: 286167MB <Seagate ST3300831AS 3.03> at ata4-master SATA150
Apr  8 18:33:12 shaw kernel: ukbd0: CHESEN USB Keyboard, rev 1.10/1.10, addr 2, iclass 3/1
Apr  8 18:33:12 shaw kernel: kbd1 at ukbd0
</snip>

>How-To-Repeat:

>Fix:
Downgrade to 6.0.

>Release-Note:
>Audit-Trail:
>Unformatted: