hwd fails to report different hardware on different machines. It is dicussed in this thread:
http://bbs.archlinux.org/viewtopic.php?t=10737

I have some detailed information posted in the thread. Basicly it reports a wrong refresh rate for my monitors, it fails to report any ethernet cards, my isdn card was not shown as well as my floppy drive on one machine. Both machines are updated today (pacman -Syu) and I uninstalled/reinstalled hwd and lshwd.

A paste from the thread:

[root@nert ~]# lspci
00:00.0 Host bridge: VIA Technologies, Inc. VT8377 [KT400 AGP] Host Bridge (rev 80)
00:01.0 PCI bridge: VIA Technologies, Inc.: Unknown device b198
00:0d.0 Ethernet controller: Intel Corp. 82557/8/9 [Ethernet Pro 100] (rev 08)
00:10.0 USB Controller: VIA Technologies, Inc. USB (rev 80)
00:10.1 USB Controller: VIA Technologies, Inc. USB (rev 80)
00:10.2 USB Controller: VIA Technologies, Inc. USB (rev 80)
00:10.3 USB Controller: VIA Technologies, Inc. USB 2.0 (rev 82)
00:11.0 ISA bridge: VIA Technologies, Inc. VT8235 ISA Bridge
00:11.1 IDE interface: VIA Technologies, Inc. VT82C586/B/686A/B PIPC Bus Master IDE (rev 06)
00:11.5 Multimedia audio controller: VIA Technologies, Inc. VT8233 AC97 Audio Controller (rev 50)
00:12.0 Ethernet controller: VIA Technologies, Inc. VT6102 [Rhine-II] (rev 74)
01:00.0 VGA compatible controller: nVidia Corporation: Unknown device 0185 (rev c1)


HARDWARE DETECT ver 4.5 (simple mode)
Kernel : 2.6.11.3-cd-1
CPU & Cache: Processor 0 is AMD Sempron(tm) 2300+ 1583MHz, 256 KB Cache

ALSA(sound): VIA Technologies, Inc.|L7VTA v1.0 Motherboard (KT400-8235) module: snd-via82xx
Video : NVIDIA Corp.|NV18.6? GeForce4 MX 4000 server: XFree86 (nv)
Monitor : Generic Monitor H: 28.0-96.0kHz V: 50.0-75.0Hz
Mouse : Logitech Inc.|Mouse type: imps2 xtype: IMPS/2 device: /dev/input/mice

Drive(ide) : Maxtor 6Y080P0 (HD) 81969MB / 7936KB cache device: /dev/hda
Drive(ide) : IBM-DTLA-305040 (HD) 41176MB / 380KB cache device: /dev/hdb
Drive(ide) : LITE-ON LTR-52246S (CDROM) 0MB device: /dev/hdc
Drive(ide) : _NEC DVD_RW ND-3520A (DVDROM) 0MB device: /dev/hdd
Swap : Found 1999864KB device: /dev/hda3
Floppy : mapped APIC to ffffd000 (fee00000)
USB : USB found module: uhci_hcd
USB(drive) : SanDisk Corp.|ImageMate CF/MMC/SD Reader module: usb-storage
Pinter(USB): No USB printer.
Scanner : No scanner

Ethernet : No Ethernet card
Modem : No Modem
Firewire : No Firewire
PCMCIA : Run hwd -e for PCMCIA cards.

As you can see, the ethernet controllers (Intel Etherpress Pro 100 and onboard VIA Rhine) are not listed. I did not load a driver for the Intel card, but the VIA Rhine is up and running.

The rates for the monitor (LGE L1715S) are:
HorizSync 30.0 - 83.0
VertRefresh 56.0 - 75.0

Machine 2:

[root@rotvogel ~]# lspci
00:00.0 Host bridge: Intel Corp. 440BX/ZX/DX - 82443BX/ZX/DX Host bridge (rev 03)
00:01.0 PCI bridge: Intel Corp. 440BX/ZX/DX - 82443BX/ZX/DX AGP bridge (rev 03)
00:07.0 ISA bridge: Intel Corp. 82371AB/EB/MB PIIX4 ISA (rev 02)
00:07.1 IDE interface: Intel Corp. 82371AB/EB/MB PIIX4 IDE (rev 01)
00:07.2 USB Controller: Intel Corp. 82371AB/EB/MB PIIX4 USB (rev 01)
00:07.3 Bridge: Intel Corp. 82371AB/EB/MB PIIX4 ACPI (rev 02)
00:09.0 Network controller: Cologne Chip Designs GmbH ISDN network controller [HFC-PCI] (rev 02)
00:0b.0 Ethernet controller: 3Com Corporation 3c905C-TX/TX-M [Tornado] (rev 74)
00:0d.0 Multimedia audio controller: Creative Labs SB Live! EMU10k1 (rev 04)
00:0d.1 Input device controller: Creative Labs SB Live! MIDI/Game Port (rev 01)
00:0f.0 Ethernet controller: Standard Microsystems Corp [SMC] 83C170QF (rev 08)
00:13.0 Unknown mass storage controller: Triones Technologies, Inc. HPT366/368/370/370A/372 (rev 03)
01:00.0 VGA compatible controller: Matrox Graphics, Inc. MGA G550 AGP (rev 01)

HARDWARE DETECT ver 4.5 (simple mode)
Kernel : 2.6.11.2-dvd
CPU & Cache: Processor 0 is Pentium III (Coppermine) 1000MHz, 256 KB Cache

ALSA(sound): Creative Labs|SB Live! (audio) module: snd-emu10k1
Video : Matrox|MGA G550 AGP server: XFree86 (mga)
Monitor : Generic Monitor H: 28.0-96.0kHz V: 50.0-75.0Hz
Mouse : Generic PS/2 Wheel Mouse type: ps2 xtype: PS/2 device: /dev/psaux

Drive(ide) : WDC WD400AB-32BVA0 (HD) 40023MB / 2048KB cache device: /dev/hda
Drive(ide) : LITE-ON LTR-52327S (CDROM) 0MB device: /dev/hdc
Drive(ide) : Maxtor 6Y080P0 (HD) 81969MB / 7936KB cache device: /dev/hde
Drive(ide) : Maxtor 6Y080P0 (HD) 81969MB / 7936KB cache device: /dev/hdg
Swap : Found 2097136KB device: /dev/hde6
Floppy : No Floppy drive
USB : USB found module: uhci_hcd
USB(drive) : No USB drive.
Pinter(USB): No USB printer.
Scanner : No scanner

Ethernet : No Ethernet card
Modem : No Modem
Firewire : No Firewire
PCMCIA : Run hwd -e for PCMCIA cards.

Ethernet: It missed the 2 nics as well: 3Com 905C TX/M and the SMC 9432 TX (eepro100). The ISDN card and the floppy drive are missing as well. The were both detected during boot. The refresh rates for this monitor are (Samsung SM 152V) :
H 31-61
V 56-75

I use a custom kernel, based on 2.6.11 with the Greg KH patches and the cdburning patch. If you need more info please let me know.