Re: How to resume USB hubs
What about looking or turn to defaults your bios?
On 02/09/10 23:10, Gero Putzar wrote:
Hi,
when I tried to log in to my computer today, I realized that the usb ports
are not working anymore, therefore I've got no keyboard and no mouse
anymore. Logging in via ssh, I checked that besides that everything seems to
be running fine.
I googled around a bit and assume that the built in usb hubs (there seem to
be 4 or 5 of them) shut down maybe as a power saving feature. Does anyone
have an idea how to wake them up again?
If I plug in anything into one of the usb ports the /var/log/messages
doesn't show the usual message that the kernel recognized a new usb device.
I tried to write to the /sys/bus/usb/... files but unfortunately:
# echo on> /sys/bus/usb/devices/1-0\:1.0/power/level
bash: /sys/bus/usb/devices/1-0:1.0/power/level: No such file or directory
Is there a way to reset the usb hubs or to reinitialise the corresponding
kernel drivers or whatever deals with it? (I cannot reboot the computer at
the moment.) I tried:
# modprobe usbcore
FATAL: Module usbcore not found.
... and again without success:
# /etc/init.d/udev restart
I'm running the current Debian Lenny on a HP desktop with the standard Gnome
desktop.
Thanks, Gero.
I attached some output of how I tried to figure out the reason. Mouse and
keyboard were connected (via an external hub in the monitor) but that does
not seem to matter.
# ls /sys/bus/usb/devices
1-0:1.0 2-0:1.0 3-0:1.0 4-0:1.0 5-0:1.0 usb1 usb2 usb3 usb4 usb5
# ls -R /sys/bus/usb/devices/1-0\:1.0/
/sys/bus/usb/devices/1-0:1.0/:
bAlternateSetting bInterfaceSubClass ep_81 uevent
bInterfaceClass bNumEndpoints modalias
usb_endpoint:usbdev1.1_ep81
bInterfaceNumber bus power
bInterfaceProtocol driver subsystem
/sys/bus/usb/devices/1-0:1.0/power:
wakeup
# cat /sys/bus/usb/devices/1-0\:1.0/power/wakeup
# echo enable> /sys/bus/usb/devices/1-0\:1.0/power/wakeup
bash: echo: write error: Invalid argument
# lsusb
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
# lsusb -v -s 1:
Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 9 Hub
bDeviceSubClass 0 Unused
....
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 25
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xe0
Self Powered
Remote Wakeup
MaxPower 0mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 0 Unused
bInterfaceProtocol 0 Full speed (or root) hub
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0002 1x 2 bytes
bInterval 255
Hub Descriptor:
bLength 9
bDescriptorType 41
nNbrPorts 2
wHubCharacteristic 0x000a
No power switching (usb 1.0)
Per-port overcurrent protection
bPwrOn2PwrGood 1 * 2 milli seconds
bHubContrCurrent 0 milli Ampere
DeviceRemovable 0x00
PortPwrCtrlMask 0xff
Hub Port Status:
Port 1: 0000.0100 power
Port 2: 0000.0100 power
Device Status: 0x0003
Self Powered
Remote Wakeup Enabled
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Ing. Olaf Reitmaier Veracierta<olafrv@gmail.com>
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