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after switching to unstable release, USB support got cranky

Dear all,

recently I switched from stable to unstable/testing release of Debian.
Apart from lots of good things, USB support (especially hotplug
subsystem's part of handling it) is not functioning properly anymore.
After plugging in memory stick and/or ORB drive, and doing lsmod, it's
status says "initializing" - and that's it. Virtual terminal hangs when
I try to look into /proc/bus/usb/*.

I can load usb-storage module properly by hand. i.e. not via hotplug.
After taht, however, I can't mount it:

    # mount /mnt/orb
    mount: /dev/sda5 is not a valid block device

This is what 'dmesg' spits out when I don't use hotplug (I modprobe
usb-storage by hand):


uhci.c: USB Universal Host Controller Interface driver v1.1
PCI: Found IRQ 11 for device 00:07.2
uhci.c: USB UHCI at I/O 0x3440, IRQ 11
usb.c: new USB bus registered, assigned bus number 1
uhci.c: detected 2 ports
usb.c: kmalloc IF c9d2e9a0, numif 1
usb.c: new device strings: Mfr=0, Product=2, SerialNumber=1
usb.c: USB device number 1 default language ID 0x0
Product: USB UHCI-alt Root Hub
SerialNumber: 3440
hub.c: USB hub found
hub.c: 2 ports detected
hub.c: standalone hub
hub.c: ganged power switching
hub.c: global over-current protection
hub.c: Port indicators are not supported
hub.c: power on to power good time: 2ms
hub.c: hub controller current requirement: 0mA
hub.c: port removable status: RR
hub.c: local power source is good
hub.c: no over-current condition exists
hub.c: enabling power on all ports
usb.c: hub driver claimed interface c9d2e9a0
usb.c: kusbd: /sbin/hotplug add 1
apm: BIOS version 1.2 Flags 0x03 (Driver version 1.16)
cs: IO port probe 0x0c00-0x0cff: clean.
cs: IO port probe 0x0800-0x08ff: clean.
cs: IO port probe 0x0100-0x04ff: excluding 0x100-0x107 0x170-0x177
0x370-0x37f 0x4d0-0x4d7
cs: IO port probe 0x0a00-0x0aff: clean.
SCSI subsystem driver Revision: 1.00
Initializing USB Mass Storage driver...
usb.c: registered new driver usb-storage
USB Mass Storage support registered.
uhci.c: root-hub INT complete: port1: 93 port2: 80 data: 2
hub.c: port 1 connection change
hub.c: port 1, portstatus 101, change 1, 12 Mb/s
hub.c: port 1, portstatus 103, change 0, 12 Mb/s
hub.c: USB new device connect on bus1/1, assigned device number 2
usb.c: USB device not accepting new address=2 (error=-32)
hub.c: port 1, portstatus 103, change 0, 12 Mb/s
hub.c: USB new device connect on bus1/1, assigned device number 3
usb.c: USB device not accepting new address=3 (error=-32)


Could anyone help?


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