I 've got the same problem, on  Release Candidate "Hardy "
When I try to install unbuntu my raid array is not recognized.
I've try many distrib the only one who work is a Suse 10.3 x86_64

ICH9 chipset, Raid0 array with 2 SATA 500G hard drives
MB : Asus P5E3 Deluxe
Proc : Intel Core II duo E8200

At start up I've download the dmraid 1.0.0.rc14 from synaptic
When dmraid try to load :
dmesg ->
[  365.049072] device-mapper: uevent: version 1.0.3
[  365.049095] device-mapper: ioctl: 4.12.0-ioctl (2007-10-02) initialised: <email address hidden>
[  365.210015] device-mapper: table: 254:0: striped: Couldn't parse stripe destination

Here the lspci output
00:00.0 Host bridge: Intel Corporation 82X38/X48 Express DRAM Controller (rev 01)
00:01.0 PCI bridge: Intel Corporation 82X38/X48 Express Host-Primary PCI Express Bridge (rev 01)
00:1a.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4 (rev 02)
00:1a.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #5 (rev 02)
00:1a.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #6 (rev 02)
00:1a.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #2 (rev 02)
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 02)
00:1c.0 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 1 (rev 02)
00:1c.4 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 5 (rev 02)
00:1c.5 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 6 (rev 02)
00:1d.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1 (rev 02)
00:1d.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 (rev 02)
00:1d.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 (rev 02)
00:1d.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 92)
00:1f.0 ISA bridge: Intel Corporation 82801IR (ICH9R) LPC Interface Controller (rev 02)
00:1f.2 RAID bus controller: Intel Corporation 82801 SATA RAID Controller (rev 02)
00:1f.3 SMBus: Intel Corporation 82801I (ICH9 Family) SMBus Controller (rev 02)
01:00.0 VGA compatible controller: nVidia Corporation GeForce 8800 GT (rev a2)
02:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8056 PCI-E Gigabit Ethernet Controller (rev 12)
03:00.0 SATA controller: JMicron Technologies, Inc. JMicron 20360/20363 AHCI Controller (rev 03)
03:00.1 IDE interface: JMicron Technologies, Inc. JMicron 20360/20363 AHCI Controller (rev 03)
05:03.0 FireWire (IEEE 1394): Agere Systems FW323 (rev 70)
05:04.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8110SC/8169SC Gigabit Ethernet (rev 10)

ubuntu@ubuntu:~$ sudo dmraid -r
/dev/sdb: isw, "isw_jbighgfhf", GROUP, ok, 976773166 sectors, data@ 0
/dev/sda: isw, "isw_jbighgfhf", GROUP, ok, 976773166 sectors, data@ 0

And the module loaded :
Module                  Size  Used by
dm_mod                 62660  0 
nls_utf8                2944  0 
ufs                    85252  0 
qnx4                   12292  0 
hfsplus                79748  0 
hfs                    49796  0 
minix                  34180  0 
ntfs                  107584  0 
msdos                  10752  0 
xfs                   571288  0 
reiserfs              239616  0 
jfs                   190180  0 
ext3                  136712  0 
jbd                    48404  1 ext3
vfat                   14464  0 
fat                    54556  2 msdos,vfat
ext2                   73352  0 
mbcache                 9600  2 ext3,ext2
ipv6                  267780  10 
af_packet              23812  4 
rfcomm                 41744  2 
l2cap                  25728  13 rfcomm
bluetooth              61156  4 rfcomm,l2cap
ppdev                  10372  0 
parport_pc             36260  0 
lp                     12324  0 
parport                37832  3 ppdev,parport_pc,lp
acpi_cpufreq           10796  1 
cpufreq_userspace       5284  0 
cpufreq_stats           7104  0 
cpufreq_powersave       2688  0 
cpufreq_ondemand        9740  1 
freq_table              5536  3 acpi_cpufreq,cpufreq_stats,cpufreq_ondemand
cpufreq_conservative     8712  0 
video                  19856  0 
output                  4736  1 video
sbs                    15112  0 
sbshc                   7680  1 sbs
container               5632  0 
dock                   11280  0 
ac                      6916  0 
iptable_filter          3840  0 
ip_tables              14820  1 iptable_filter
x_tables               16132  1 ip_tables
snd_hda_intel         344600  3 
snd_pcm_oss            42144  0 
snd_mixer_oss          17920  1 snd_pcm_oss
snd_pcm                78596  2 snd_hda_intel,snd_pcm_oss
snd_page_alloc         11400  2 snd_hda_intel,snd_pcm
snd_hwdep              10500  1 snd_hda_intel
snd_seq_dummy           4868  0 
snd_seq_oss            35584  0 
snd_seq_midi            9376  0 
snd_rawmidi            25760  1 snd_seq_midi
joydev                 13120  0 
snd_seq_midi_event      8320  2 snd_seq_oss,snd_seq_midi
snd_seq                54224  6 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_seq_midi_event
snd_timer              24836  2 snd_pcm,snd_seq
agpgart                34760  0 
i2c_core               24832  0 
snd_seq_device          9612  5 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_rawmidi,snd_seq
sky2                   47492  0 
snd                    56996  17 snd_hda_intel,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_hwdep,snd_seq_dummy,snd_seq_oss,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
evdev                  13056  4 
shpchp                 34452  0 
button                  9232  0 
iTCO_wdt               13092  0 
iTCO_vendor_support     4868  1 iTCO_wdt
soundcore               8800  1 snd
pci_hotplug            30880  1 shpchp
pcspkr                  4224  0 
battery                14212  0 
squashfs               49160  1 
loop                   18948  2 
unionfs                76752  1 
nls_cp437               6656  1 
isofs                  36388  1 
sg                     36880  0 
sr_mod                 17956  1 
cdrom                  37408  1 sr_mod
sd_mod                 30720  2 
usbhid                 31872  0 
hid                    38784  1 usbhid
ohci1394               33584  0 
r8169                  32900  0 
ieee1394               93752  1 ohci1394
ata_generic             8324  0 
ahci                   28420  2 
libata                159344  2 ata_generic,ahci
scsi_mod              151436  4 sg,sr_mod,sd_mod,libata
ehci_hcd               37900  0 
uhci_hcd               27024  0 
usbcore               146028  4 usbhid,ehci_hcd,uhci_hcd
thermal                16796  0 
processor              36872  2 acpi_cpufreq,thermal
fan                     5636  0 
fbcon                  42912  0 
tileblit                3456  1 fbcon
font                    9472  1 fbcon
bitblit                 6784  1 fbcon
softcursor              3072  1 bitblit
fuse                   50580  2 

Many thanks for your great job, Ubuntu is realy a good Distrib.