USB ports not working after device disconnect
Hi folks,
Occasionally, when I disconnect a device (usually a mass storage device)
from my laptop (Lenovo Thinkpad x201), the USB ports stop recognising
devices when I plug them in until I reboot. The ports are still powered
and will charge e.g. a phone if I plug one in but nothing at all is
registered by dmesg or logged in /var/log/messages.
Last time this happened lsusb showed a 'linux root hub' and an 'Intel
rate matching hub' and nothing else. I've rebooted the machine and then
had two of each of these (there was only 1 before) along with the
inbuilt fingerprint reader and a device just described as "Lenovo",
which suggests to me Debian is somehow losing one of the root hubs.
Before I rebooted it last time, I tried removing and reprobing the usb
modules (i.e. usbcore and anything which depend on it) but this made no
difference.
Anyone any idea why this might be happening, or what I can do to try and
fix it?
Thanks
Laurence
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