On Sun, 27 Jan 2008, William Murray wrote: > > Hello all, > I am trying to understand a laptop with 4 USB ports, > apparently identical, but all 4 work under windows and only 2 under F8. > If I look in 'hwbrowser' I see 3 controllers, (2 UHCI and 1 EHCI I > think) but no 'USB UHCI #n' entries like I expect. > cat /proc/bus/usb/devices shows up 3 controllers, and the USB mouse I > have plugged in. > It ALSO shows a device "0baa 0158", which is somehow a Realtek disk (I > don't think there IS one) but not "0bda 8187" (or is it 8189) that I > think the wireless card should be registered as. i'm thinking this would be a good time for someone to point us at a decent tutorial on USB under linux since, as i was poking around, i began to get a bit confused. i have a gateway laptop with 4 USB ports (all 4 of which work under f8, bwahahahaha!!). currently plugged in: * io/magic 250G HD * keyboard * logitech optical mouse * brother printer all fully functional. the USB-related output from "lspci": ... 00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #1 (rev 02) 00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #2 (rev 02) 00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #3 (rev 02) 00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #4 (rev 02) 00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2 EHCI Controller (rev 02) ... my first (admittedly uneducated) guess was that each of those UHCI controllers was associated with a distinct port. but: $ lsusb -t Bus# 5 `-Dev# 1 Vendor 0x0000 Product 0x0000 Bus# 4 `-Dev# 1 Vendor 0x0000 Product 0x0000 Bus# 3 `-Dev# 1 Vendor 0x0000 Product 0x0000 |-Dev# 4 Vendor 0x04f9 Product 0x0028 `-Dev# 3 Vendor 0x046d Product 0xc00e Bus# 2 `-Dev# 1 Vendor 0x0000 Product 0x0000 `-Dev# 3 Vendor 0x413c Product 0x2005 Bus# 1 `-Dev# 1 Vendor 0x0000 Product 0x0000 `-Dev# 4 Vendor 0x067b Product 0x2506 $ so bus 1 and bus 2 each have one of the devices, but bus 3 controls two of them. i guess i'm just not conversant enough with how USB devices are allocated to busses and devices. is there a decent online page that explains how that allocation works? especially how it might differ when devices are already attached at boot time versus what happens when they're hot-plugged? thanks. rday -- ======================================================================== Robert P. J. Day Linux Consulting, Training and Annoying Kernel Pedantry Waterloo, Ontario, CANADA Home page: http://crashcourse.ca Fedora Cookbook: http://crashcourse.ca/wiki/index.php/Fedora_Cookbook ========================================================================
