Re: USB bus fails to see devices
- From: Hugo Vanwoerkom <hvw59601@xxxxxxxxx>
- Date: Sat, 14 Jul 2007 06:56:24 -0500
Haines Brown wrote:
I've been able to use all my USB devices (camera, scanner, printer,
bub, etc.), but at one point that I can't associate with any event, two
devices (camera and scanner) are no longer seen by the USB bus.
$ uname -a
Linux teufel 2.6.18-4-686 #1 SMP Wed May 9 23:03:12 UTC 2007 i686 GNU/Linux
$ apt-show-versions udev
udev/etch uptodate 0.105-4
The printer and scanner are connected to the root hub; the printer is
seen, but not the scanner. A camera, usb-key and usb external hard
disk are connected to an external hub; the latter are seen, but not
the camera. I disconnected irrelevant devices to eliminate any usb bus
power issues. and so it seems the bus and cables are OK.
However, the bus does not see my Canon camera and Epson scanner, while
it does see a Western Digital USB external HD, a Lexar USB-key, a
Genesys USB hub, and a Lexmark printer:
$ lsusb
Bus 002 Device 011: ID 1058:0701 Western Digital Technologies, Inc. Bus 002 Device 009: ID 05dc:a400 Lexar Media, Inc. Bus 002 Device 002: ID 05e3:0605 Genesys Logic, Inc. USB 2.0 Hub [ednet]
Bus 002 Device 001: ID 0000:0000 Bus 001 Device 004: ID 043d:0052 Lexmark International, Inc. Bus 001 Device 001: ID 0000:0000
Likewise, in /var/log/syslog, when the printer or camera is replugged,
there is no report of it there at all.
The module list looks OK to me.
$ lsmod | grep 'usb\|hci'
usb_storage 71840 0 usblp 12768 0 scsi_mod 124168 6 usb_storage,sbp2,sd_mod,libata,
aic79xx,scsi_transport_spi
ehci_hcd 28136 0 ohci1394 30800 0 ieee1394 86904 3 sbp2,eth1394,ohci1394
ohci_hcd 18276 0 ide_core 110504 4 usb_storage,ide_cd,amd74xx,generic
usbcore 112644 5 usb_storage,usblp,ehci_hcd,ohci_hcd
When I was runing Woody, stock kernel 2.4, I had something like:
$ more /proc/bus/usb/drivers
usbdevfs
hub
0- 15: usblp
but with Etch, stock kernel 2.6 I have no such directory. Not sure
why.
I'm having trouble understanding $ dmesg | grep -i usb
for it looks like my printer and USB mass storage devices aer loaded
multiple times.
Should I have seen a /proc/bus/usb/drivers directory with some drivers
in it? Given the above, where is it likely the problem lies?
With:
$ uname -a
Linux debian 2.6.21-1-k7 #1 SMP Sat May 26 16:56:05 UTC 2007 i686 GNU/Linux
and:
$ lsusb
Bus 005 Device 003: ID 04b4:6830 Cypress Semiconductor Corp. USB-2.0 IDE Adapter
Bus 005 Device 001: ID 0000:0000
Bus 004 Device 001: ID 0000:0000
Bus 003 Device 001: ID 0000:0000
Bus 002 Device 003: ID 09da:0006 A4 Tech Co., Ltd Optical Mouse WOP-35 / Trust 450L Optical Mouse
Bus 002 Device 002: ID 09da:0006 A4 Tech Co., Ltd Optical Mouse WOP-35 / Trust 450L Optical Mouse
Bus 002 Device 001: ID 0000:0000
Bus 001 Device 004: ID 051d:0002 American Power Conversion Back-UPS Pro 500/1000/1500
Bus 001 Device 001: ID 0000:0000
and:
# lsmod | grep 'usb\|hci'
usbhid 23840 1
hid 24192 1 usbhid
usb_storage 77248 4
ehci_hcd 31116 0
uhci_hcd 23056 0
usbcore 123976 6 usbhid,usb_storage,ehci_hcd,uhci_hcd
scsi_mod 134412 4 sg,sd_mod,usb_storage,libata
ide_core 115656 6 usb_storage,ide_generic,ide_cd,ide_disk,via82cxxx,generic
I see no such directory.
But in a related matter, my mobo (EP-8VTAI) manual says:
...
VIA chipset...as well as up to eight USB ports...
...
but it has only 4 USB ports.
Meaning with an external 6 port hub, you could only use half of the ports?
Hugo
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