acd0 broken, umass probe takes 5 minutes at boot.

FreeBSD clk01a 6.0-CURRENT FreeBSD 6.0-CURRENT #: Sun May  8 16:38:09 EDT 2005     
nicblais_at_clk01a:/usr/obj/usr/src/sys/CLK01A  i386

(Warning, long read)

Hi,

Since I cvsup'd and buildworld/kernel yesterday (after a fresh install of 
March_05 snapshot), my dvdr (acd0) no longer works. 
I had atapicam enabled in my kernel conf file and disabling it does nothing. I 
still get the following errors when trying to read a dvd :
acd0: timeout waiting for ATAPI ready
acd0: error issuing ATA PACKET command
and if I try to mount a cd/dvd, it crashes the system.  

With atapicam enabled, I get several loops of this at boot:
(da0:ata1:0:0:0): READ CAPACITY. CDB: 25 0 0 0 0 0 0 0 0 0 
(da0:ata1:0:0:0): CAM Status: SCSI Status Error
(da0:ata1:0:0:0): SCSI Status: Check Condition
(da0:ata1:0:0:0): NOT READY csi:0,0,bb,0 asc:3a,0
(da0:ata1:0:0:0): Medium not present
(da0:ata1:0:0:0): (da0:ata1:0:0:0): READ CAPACITY. CDB: 25 0 0 0 0 0 0 0 0 0 
(da0:ata1:0:0:0): NOT READY csi:0,0,bb,0 asc:3a,0
(da0:ata1:0:0:0): Medium not present
Unretryable error
(da0:ata1:0:0:0): error 6
(da0:ata1:0:0:0): Unretryable Error
Opened disk da0 -> 6
and still no access to acd0 or it's scsi form. The dvdr is set physically set 
as master (not CS) and runs alone on it's channel. I tried changing the cable 
from 80 conductor to 40 conductor (spare parts...) and nothing changed.

Also, whether I have atapicam enabled or not, booting takes about 5 minutes 
because the umass probe is hanging. It will ouput 5 times :
(probe0:umass-sim0:0:0:0): Request completed with CAM_REQ_CMP_ERR
(probe0:umass-sim0:0:0:0): Retrying Command.
With about a minute in between.

Ironically, after boot, pluging-in a USB mp3 player works and creates da1 
successfully. These two problems were not present in the March_05 snapshot. 
My wild guess would be that something happened to either pass, da or scbus 
that my system doesn't like.

Any suggestions? Should I send_pr?

Thanks,
Nicolas.