Well, I have a PC box, kernel 2.4.20-20.9 with two hubs. On booting I have 
this messages 
relevant to usb

usb.c: registered new driver usbdevfs
usb.c: registered new driver hub
usb-uhci.c: $Revision: 1.275 $ time 11:55:13 Aug 18 2003
usb-uhci.c: High bandwidth mode enabled
usb-uhci.c: USB UHCI at I/O 0xd000, IRQ 12
usb-uhci.c: Detected 2 ports
usb.c: new USB bus registered, assigned bus number 1
usb-uhci.c: USB UHCI at I/O 0xd800, IRQ 11
usb-uhci.c: Detected 2 ports
usb.c: new USB bus registered, assigned bus number 2
usb-uhci.c: v1.275:USB Universal Host Controller Interface driver
usb.c: registered new driver hiddev
usb.c: registered new driver hid
input0: USB HID v1.10 Mouse [Logitech USB Mouse] on usb1:2.0
usb.c: USB device 3 (vend/prod 0x478/0x1) is not claimed by any active 
driver.
qcamvc_usb: init
usb.c: registered new driver Connectix QuickCam VC

An after that, whith usbview I see the two hubs and two devices in one of
them, the mouse and the cam. But nothing that I plug in the other hub 
is
detected or appears in the logs. I am completely lost, and after googling
for a while and searching in the list I haven't found anything

I have attached my /proc/bus/usb/devices and the output of lspci -vv

I am completely lost, and after googling 
for a while and searching in the list I haven't found anything.

I hace noticed that other machines with redhat linux have the same 
problem, i.e., the second usb hub is not working

Thanks a lot
00:00.0 Host bridge: Intel Corp. 82845 845 (Brookdale) Chipset Host Bridge (rev 04)
        Subsystem: Intel Corp. 82845 845 (Brookdale) Chipset Host Bridge
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- 
SERR- FastB2B-
        Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort+ >SERR- <PERR-
        Latency: 0
        Region 0: Memory at d0000000 (32-bit, prefetchable) [size=128M]
        Capabilities: [e4] #09 [9104]
        Capabilities: [a0] AGP version 2.0
                Status: RQ=31 SBA+ 64bit- FW+ Rate=x1,x2,x4
                Command: RQ=0 SBA- AGP+ 64bit- FW- Rate=x4

00:01.0 PCI bridge: Intel Corp. 82845 845 (Brookdale) Chipset AGP Bridge (rev 04) 
(prog-if 00 [Normal decode])
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- 
SERR+ FastB2B-
        Status: Cap- 66Mhz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- >SERR- <PERR-
        Latency: 64
        Bus: primary=00, secondary=01, subordinate=01, sec-latency=32
        Memory behind bridge: e0000000-e1ffffff
        Prefetchable memory behind bridge: d8000000-dfffffff
        BridgeCtl: Parity- SERR+ NoISA+ VGA+ MAbort- >Reset- FastB2B-

00:1e.0 PCI bridge: Intel Corp. 82801BA/CA/DB PCI Bridge (rev 05) (prog-if 00 [Normal 
decode])
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- 
SERR+ FastB2B-
        Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- >SERR- <PERR-
        Latency: 0
        Bus: primary=00, secondary=02, subordinate=02, sec-latency=32
        I/O behind bridge: 0000c000-0000cfff
        Memory behind bridge: e2000000-e3ffffff
        BridgeCtl: Parity- SERR+ NoISA+ VGA- MAbort- >Reset- FastB2B-

00:1f.0 ISA bridge: Intel Corp. 82801BA ISA Bridge (LPC) (rev 05)
        Control: I/O+ Mem+ BusMaster+ SpecCycle+ MemWINV- VGASnoop- ParErr- Stepping- 
SERR- FastB2B-
        Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- 
<MAbort- >SERR- <PERR-
        Latency: 0

00:1f.1 IDE interface: Intel Corp. 82801BA IDE U100 (rev 05) (prog-if 80 [Master])
        Subsystem: Intel Corp.: Unknown device 2442
        Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- 
SERR- FastB2B-
        Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- 
<MAbort- >SERR- <PERR-
        Latency: 0
        Region 4: I/O ports at f000 [size=16]

00:1f.2 USB Controller: Intel Corp. 82801BA/BAM USB (Hub #1) (rev 05) (prog-if 00 
[UHCI])
        Subsystem: Intel Corp. 82801BA/BAM USB (Hub #1)
        Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- 
SERR- FastB2B-
        Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- 
<MAbort- >SERR- <PERR-
        Latency: 0
        Interrupt: pin D routed to IRQ 12
        Region 4: I/O ports at d000 [size=32]

00:1f.3 SMBus: Intel Corp. 82801BA/BAM SMBus (rev 05)
        Subsystem: Intel Corp.: Unknown device 2442
        Control: I/O+ Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- 
SERR- FastB2B-
        Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- 
<MAbort- >SERR- <PERR-
        Interrupt: pin B routed to IRQ 9
        Region 4: I/O ports at 5000 [size=16]

00:1f.4 USB Controller: Intel Corp. 82801BA/BAM USB (Hub #2) (rev 05) (prog-if 00 
[UHCI])
        Subsystem: Intel Corp.: Unknown device 2442
        Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- 
SERR- FastB2B-
        Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- 
<MAbort- >SERR- <PERR-
        Latency: 0
        Interrupt: pin C routed to IRQ 11
        Region 4: I/O ports at d800 [size=32]

00:1f.5 Multimedia audio controller: Intel Corp. 82801BA/BAM AC'97 Audio (rev 05)
        Subsystem: Giga-byte Technology: Unknown device a002
        Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- 
SERR- FastB2B-
        Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- 
<MAbort- >SERR- <PERR-
        Latency: 0
        Interrupt: pin B routed to IRQ 9
        Region 0: I/O ports at dc00 [size=256]
        Region 1: I/O ports at e000 [size=64]

01:00.0 VGA compatible controller: nVidia Corporation NV11 [GeForce2 MX/MX 400] (rev 
b2) (prog-if 00 [VGA])
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- 
SERR- FastB2B-
        Status: Cap+ 66Mhz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- 
<MAbort- >SERR- <PERR-
        Latency: 248 (1250ns min, 250ns max)
        Interrupt: pin A routed to IRQ 5
        Region 0: Memory at e0000000 (32-bit, non-prefetchable) [size=16M]
        Region 1: Memory at d8000000 (32-bit, prefetchable) [size=128M]
        Expansion ROM at <unassigned> [disabled] [size=64K]
        Capabilities: [60] Power Management version 2
                Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA 
PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [44] AGP version 2.0
                Status: RQ=31 SBA- 64bit- FW+ Rate=x1,x2,x4
                Command: RQ=31 SBA- AGP+ 64bit- FW- Rate=x4

02:01.0 SCSI storage controller: Adaptec AIC-7892B U160/m (rev 02)
        Subsystem: Adaptec 19160 Ultra160 SCSI Controller
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- 
SERR- FastB2B-
        Status: Cap+ 66Mhz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- 
<MAbort- >SERR- <PERR-
        Latency: 32 (10000ns min, 6250ns max), cache line size 08
        Interrupt: pin A routed to IRQ 11
        BIST result: 00
        Region 0: I/O ports at c000 [disabled] [size=256]
        Region 1: Memory at e3000000 (64-bit, non-prefetchable) [size=4K]
        Expansion ROM at <unassigned> [disabled] [size=128K]
        Capabilities: [dc] Power Management version 2
                Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA 
PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 PME-Enable- DSel=0 DScale=0 PME-

02:04.0 Ethernet controller: 3Com Corporation 3c905C-TX/TX-M [Tornado] (rev 78)
        Subsystem: 3Com Corporation 3C905C-TX Fast Etherlink for PC Management NIC
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- 
SERR- FastB2B-
        Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- 
<MAbort- >SERR- <PERR-
        Latency: 32 (2500ns min, 2500ns max), cache line size 08
        Interrupt: pin A routed to IRQ 12
        Region 0: I/O ports at c400 [size=128]
        Region 1: Memory at e3001000 (32-bit, non-prefetchable) [size=128]
        Expansion ROM at <unassigned> [disabled] [size=128K]
        Capabilities: [dc] Power Management version 2
                Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA 
PME(D0+,D1+,D2+,D3hot+,D3cold+)
                Status: D0 PME-Enable- DSel=0 DScale=2 PME-

T:  Bus=02 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=12  MxCh= 2
B:  Alloc=  0/900 us ( 0%), #Int=  0, #Iso=  0
D:  Ver= 1.00 Cls=09(hub  ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
P:  Vendor=0000 ProdID=0000 Rev= 0.00
S:  Product=USB UHCI Root Hub
S:  SerialNumber=d800
C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr=  0mA
I:  If#= 0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub
E:  Ad=81(I) Atr=03(Int.) MxPS=   8 Ivl=255ms
T:  Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=12  MxCh= 2
B:  Alloc= 93/900 us (10%), #Int=  1, #Iso=  0
D:  Ver= 1.00 Cls=09(hub  ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
P:  Vendor=0000 ProdID=0000 Rev= 0.00
S:  Product=USB UHCI Root Hub
S:  SerialNumber=d000
C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr=  0mA
I:  If#= 0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub
E:  Ad=81(I) Atr=03(Int.) MxPS=   8 Ivl=255ms
T:  Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#=  2 Spd=1.5 MxCh= 0
D:  Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
P:  Vendor=046d ProdID=c001 Rev= 4.10
S:  Manufacturer=Logitech
S:  Product=USB Mouse
C:* #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr= 50mA
I:  If#= 0 Alt= 0 #EPs= 1 Cls=03(HID  ) Sub=01 Prot=02 Driver=hid
E:  Ad=81(I) Atr=03(Int.) MxPS=   4 Ivl=10ms
T:  Bus=01 Lev=01 Prnt=01 Port=01 Cnt=02 Dev#=  3 Spd=12  MxCh= 0
D:  Ver= 1.00 Cls=ff(vend.) Sub=00 Prot=ff MxPS= 8 #Cfgs=  1
P:  Vendor=0478 ProdID=0001 Rev= 1.00
C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=236mA
I:  If#= 0 Alt= 0 #EPs= 1 Cls=ff(vend.) Sub=01 Prot=ff Driver=Connectix QuickCam VC
E:  Ad=01(O) Atr=02(Bulk) MxPS=  64 Ivl=0ms
I:  If#= 0 Alt= 1 #EPs= 2 Cls=ff(vend.) Sub=02 Prot=ff Driver=Connectix QuickCam VC
E:  Ad=01(O) Atr=02(Bulk) MxPS=  64 Ivl=0ms
E:  Ad=82(I) Atr=02(Bulk) MxPS=  64 Ivl=0ms
I:  If#= 0 Alt= 2 #EPs= 3 Cls=ff(vend.) Sub=02 Prot=ff Driver=Connectix QuickCam VC
E:  Ad=01(O) Atr=02(Bulk) MxPS=  64 Ivl=0ms
E:  Ad=82(I) Atr=02(Bulk) MxPS=  64 Ivl=0ms
E:  Ad=83(I) Atr=03(Int.) MxPS=   4 Ivl=1ms

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