Usb devices not working after 2.6.38 kernel upgrade

Question

Hello everyone,
today I've upgraded my aur system to the latest packages version , kernel 2.6.38-2  .
After the reboot the usb keyboard doesn't work at all , as the usb mouse, leaving me struck at the login screen .
If I try to modify kernel boot parameters in grub or in a live distro  (sysrescd) the keyboard works flawlessy .
Any clue ?
thanks in advance

Answer 1

I just updated to 2.6.38.7-1. The USB devices that I have plugged in before booting work (e.g USB headset). If I try to insert a new USB device, it isn't recognized. Flash-disks and USB mice that worked under the last kernel aren't working at all.
Is there a command that lets you "turn on" a USB device, or force the kernel to recognize it? I tried messing around in /sys/bus, but even in the root shell, I got "invalid write" errors.
Interesting snippet from dmesg;
[   19.399041] uhci_hcd 0000:00:1a.0: PCI INT A disabled
[   19.399447] uhci_hcd 0000:00:1a.1: PCI INT B disabled
[   19.412940] uhci_hcd 0000:00:1d.1: PCI INT B disabled
[   19.413381] uhci_hcd 0000:00:1d.2: PCI INT C disabled
[  151.340126] uhci_hcd 0000:00:1d.0: PCI INT A disabled
Here's where it finds my webcam;
[    9.626704] usb 2-5: new high speed USB device using ehci_hcd and address 3
[   10.381678] input: HP Webcam as /devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5:1.0/input/input15
[   10.381759] usbcore: registered new interface driver uvcvideo
.. and where it finds the mouse I had plugged in (you can see me disconnect it at entry 148);
[   10.490045] usb 5-1: new low speed USB device using uhci_hcd and address 2
[   11.201856] input: Dell Dell USB Optical Mouse as /devices/pci0000:00/0000:00:1d.0/usb5/5-1/5-1:1.0/input/input16
[   11.202001] generic-usb 0003:413C:3012.0001: input,hidraw0: USB HID v1.11 Mouse [Dell Dell USB Optical Mouse] on usb-0000:00:1d.0-1/input0
[   11.202017] usbcore: registered new interface driver usbhid
[   11.202019] usbhid: USB HID core driver
[  148.846756] usb 5-1: USB disconnect, address 2
When I try to reconnect the mouse, nothing happens. You can see that the kernel has this error repeatedly;
ehci_hcd 0000:00:1d.7: cache line size of 64 is not supported
Edit: Found a temporary fix*.
# cd /sys/bus/usb/devices/
# for device in usb*; do echo "on" > $device/power/control; done
* I'm not responsible for what happens to your devices when you run this, but it worked for me. Check out: http://www.mjmwired.net/kernel/Document … gement.txt
Last edited by vkumar (2011-05-28 04:28:05)