lspci shows all devices as unknown

[Lin Shao <shao@msg.ucsf.edu>]

I'm running a  2.6.15-1-em64t-p4-smp kernel. Most of the hardwares are working 
fine, but lspci shows all of them as unknown:

0000:00:00.0 Host bridge: Intel Corp.: Unknown device 2770
0000:00:01.0 PCI bridge: Intel Corp.: Unknown device 2771
0000:00:1b.0 0403: Intel Corp.: Unknown device 27d8 (rev 01)
0000:00:1c.0 PCI bridge: Intel Corp.: Unknown device 27d0 (rev 01)
0000:00:1c.4 PCI bridge: Intel Corp.: Unknown device 27e0 (rev 01)
0000:00:1c.5 PCI bridge: Intel Corp.: Unknown device 27e2 (rev 01)
0000:00:1d.0 USB Controller: Intel Corp.: Unknown device 27c8 (rev 01)
0000:00:1d.1 USB Controller: Intel Corp.: Unknown device 27c9 (rev 01)
0000:00:1d.2 USB Controller: Intel Corp.: Unknown device 27ca (rev 01)
0000:00:1d.3 USB Controller: Intel Corp.: Unknown device 27cb (rev 01)
0000:00:1d.7 USB Controller: Intel Corp.: Unknown device 27cc (rev 01)
0000:00:1e.0 PCI bridge: Intel Corp. 82801 PCI Bridge (rev e1)
0000:00:1f.0 ISA bridge: Intel Corp.: Unknown device 27b0 (rev 01)
0000:00:1f.1 IDE interface: Intel Corp.: Unknown device 27df (rev 01)
0000:00:1f.2 0106: Intel Corp.: Unknown device 27c1 (rev 01)
0000:00:1f.3 SMBus: Intel Corp.: Unknown device 27da (rev 01)
0000:01:00.0 VGA compatible controller: ATI Technologies Inc: Unknown device 
5b62
0000:01:00.1 Display controller: ATI Technologies Inc: Unknown device 5b72
0000:04:00.0 Ethernet controller: Intel Corp.: Unknown device 109a (rev 01)


any idea why? Thanks a lot.

Lin