No devices detected in gparted

Binary package hint: gparted

I use the edgy beta version.

When I start gparted, no devices are detected on the following PC.
here is the output from lspci:

# lspci
00:00.0 Host bridge: ATI Technologies Inc RS480 Host Bridge (rev 01)
00:01.0 PCI bridge: ATI Technologies Inc RS480 PCI Bridge
00:06.0 PCI bridge: ATI Technologies Inc RS480 PCI Bridge
00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration
00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map
00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM Controller
00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Miscellaneous Control
00:19.0 PCI bridge: ALi Corporation M5249 HTT to PCI Bridge
00:1c.0 USB Controller: ALi Corporation USB 1.1 Controller (rev 03)
00:1c.1 USB Controller: ALi Corporation USB 1.1 Controller (rev 03)
00:1c.2 USB Controller: ALi Corporation USB 1.1 Controller (rev 03)
00:1c.3 USB Controller: ALi Corporation USB 2.0 Controller (rev 01)
00:1d.0 Audio device: ALi Corporation High Definition Audio/AC'97 Host Controller
00:1e.0 ISA bridge: ALi Corporation PCI to LPC Controller (rev 31)
00:1e.1 Bridge: ALi Corporation M7101 Power Management Controller [PMU]
00:1f.0 IDE interface: ALi Corporation M5229 IDE (rev c7)
00:1f.1 RAID bus controller: ALi Corporation ULi 5287 SATA (rev 02)
01:05.0 VGA compatible controller: ATI Technologies Inc RS480 [Radeon Xpress 200G Series]
02:00.0 Ethernet controller: Broadcom Corporation NetLink BCM5789 Gigabit Ethernet PCI Express (rev 11)
03:15.0 FireWire (IEEE 1394): VIA Technologies, Inc. IEEE 1394 Host Controller (rev 80)

When I start parted, I can see the partitition table for /dev/hdb:

# sudo parted /dev/hdb
GNU Parted 1.7.1
Using /dev/hdb
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print

Disk /dev/hdb: 200GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number Start End Size Type File system Flags
 1 32.3kB 73.4GB 73.4GB primary ntfs boot
 2 73.4GB 105GB 31.5GB primary ext3
 3 105GB 107GB 2056MB primary linux-swap

It also works, when I specify /dev/hdb to gparted:
sudo gparted /dev/hdb

The problem is, that "sudo gparted" doesn't show any disks.
That is also a big problem in the installer, since there is no target for the
installation.