Help : Problem with Acard ATP865R UDMA133 controller on freebsd 5.2.1-p11

Hi,

I've upgraded my freebsd 5.2.0 Release to 5.2.1-p11.FreeBSD
I use Acard AEC-6880 PCI ATA/133 IDE RAID (Acard UDMA133 Controller)
drive on my PII 733 Bi-pro (MSI 690 motherboard)

I used 2 master drive for my array RAID1 :

GEOM: create disk ad8 dp=0xc6abe760
ad8: 39205MB <Maxtor 6E040L0> [79656/16/63] at ata4-master UDMA133
GEOM: create disk ad10 dp=0xc6b4ba60
ad10: 39205MB <Maxtor 6E040L0> [79656/16/63] at ata5-master UDMA133

I've made my array RAID1 in bios mode and also with atacontrol

# atacontrol create RAID1 ad8 ad10
That's created ar0 device. I created one slice on device ar0 --> /dev/ar0s1
I mounted it.
# mount -t ufs /dev/ar0s1 /usr/local/w3
# cd /usr/local/w3
# mkdir bsd --> ok
# tar zxvf data.tar.gz (1,1Mo --> 6,6Mo untared)

And my array down in degraded mode, I lose my drive ad8 with this dmesg output

ar0: 39205MB <ATA RAID1 array> [4998/255/63] status: DEGRADED subdisks:
ad8 : WARNING no status, reselecting device.
ad8 : error issuing command=ca
ad8 : error issuing DMA command

Does anyone else have the same problem with Acard IDE RAID Controler.
It worked fine under Freebsd 5.2.0 Release