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Old 06-10-2005, 01:01 AM   #1
drminix
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Interpreting the output of 'lspci' command.


Hi.

I have a IBM thinkpad T40 laptop. It has one usb root-hub with 2 ports. I ran 'lspci' command on my machine and got the following output.

:01.0 PCI bridge: Intel Corp. 82855PM Processor to AGP Controller (rev 03)
00:1d.0 USB Controller: Intel Corp. 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHC
I Controller #1 (rev 01)
00:1d.1 USB Controller: Intel Corp. 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHC
I Controller #2 (rev 01)
00:1d.2 USB Controller: Intel Corp. 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHC
I Controller #3 (rev 01)
00:1d.7 USB Controller: Intel Corp. 82801DB/DBM (ICH4/ICH4-M) USB2 EHCI Controll
er (rev 01)
00:1e.0 PCI bridge: Intel Corp. 82801 Mobile PCI Bridge (rev 81)
00:1f.0 ISA bridge: Intel Corp. 82801DBM (ICH4-M) LPC Interface Bridge (rev 01)
00:1f.1 IDE interface: Intel Corp. 82801DBM (ICH4-M) IDE Controller (rev 01)
00:1f.3 SMBus: Intel Corp. 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) SMBus Controller
(rev 01)
00:1f.5 Multimedia audio controller: Intel Corp. 82801DB/DBL/DBM (ICH4/ICH4-L/IC
H4-M) AC'97 Audio Controller (rev 01)
00:1f.6 Modem: Intel Corp. 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) AC'97 Modem Cont
roller (rev 01)
01:00.0 VGA compatible controller: ATI Technologies Inc Radeon Mobility M7 LW [R
adeon Mobility 7500]
02:00.0 CardBus bridge: Texas Instruments PCI1520 PC card Cardbus Controller (re
v 01)
02:00.1 CardBus bridge: Texas Instruments PCI1520 PC card Cardbus Controller (re
v 01)
02:01.0 Ethernet controller: Intel Corp. 82540EP Gigabit Ethernet Controller (Mo
bile) (rev 03)
02:02.0 Network controller: Intel Corp. PRO/Wireless LAN 2100 3B Mini PCI Adapte
r (rev 04)

According to this information, I should have 4 USB root hubs since I have 4 USB host controllers. But I only have only 1 USB root hub. What are 3 others controllers are used for?

Thanks in advance
 
Old 06-10-2005, 05:24 PM   #2
LinuxSeeker
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Since you use a laptop, I guess "lspci" will print different results than on a desktop. Try checking the "lspci" manual.
 
Old 06-14-2005, 03:20 AM   #3
drminix
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I posted the same question to the IBM thinkpad and got an answer.


The motherboard used in IBM T40 has 4 USB host-controllers but only one of them is made visible. That's why I got 4 USB host controllers in the output of 'lspci' command.
 
  


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