I'm seeing a similar USB problem with the latest experimental
packages.  Any operation in my personal tools triggers USB resets
in my mouse:

  Dec 31 00:38:49 priss vmunix: usb 2-1.1.3: usbfs: USBDEVFS_CONTROL failed cmd 
fsinfo rqt 128 rq 6 len 1024 ret -84
  Dec 31 00:38:49 priss vmunix: usb 2-1.1.3: USB disconnect, address 123
  Dec 31 00:38:50 priss vmunix: usb 2-1.1.3: new low speed USB device using 
uhci_hcd and address 124
  Dec 31 00:38:50 priss vmunix: usb 2-1.1.3: configuration #1 chosen from 1 
choice
  Dec 31 00:38:50 priss vmunix: input: Contour Design Contour Perfit Mouse as 
/class/input/input123
  Dec 31 00:38:50 priss vmunix: input: USB HID v1.10 Mouse [Contour Design 
Contour Perfit Mouse] on usb-0000:00:10.0-1.1.3
  Dec 31 00:38:50 priss vmunix: usb 2-1.1.3: New USB device found, 
idVendor=0b33, idProduct=08a0
  Dec 31 00:38:50 priss vmunix: usb 2-1.1.3: New USB device strings: Mfr=1, 
Product=2, SerialNumber=0
  Dec 31 00:38:50 priss vmunix: usb 2-1.1.3: Product: Contour Perfit Mouse
  Dec 31 00:38:50 priss vmunix: usb 2-1.1.3: Manufacturer: Contour Design
  Dec 31 00:38:50 priss vmunix: usb 2-1.3: usbfs: USBDEVFS_CONTROL failed cmd 
fsinfo rqt 128 rq 6 len 1024 ret -110
  Dec 31 00:38:51 priss vmunix: usb 1-3: reset high speed USB device using 
ehci_hcd and address 4

The command here is "fsinfo", which I adapted from the libmtp
examples.  It looks like the libmtp library is sending some usbfs
command to all attached devices.  This command is failing on two
devices:

  2-1.1.3 is a Contour Design Perfit Mouse
  2-1.3   is an ATEN CS-1734 KVM switch

During these failures, my mouse stutters across the screen.
Device 1-3 is the MTP media player.

The common denominator here is that the tools get a list of raw
devices (via LIBMTP_Detect_Raw_Devices), then loop across them to
match the friendly name before invoking a callback.

--

ii  libmtp-dev     0.3.5-1        Media Transfer Protocol (MTP) development fi
ii  libmtp-doc     0.3.5-1        Media Transfer Protocol (MTP) library docume
ii  libmtp7        0.2.6.1-3      Media Transfer Protocol (MTP) library
ii  libmtp8        0.3.5-1        Media Transfer Protocol (MTP) library
ii  mtp-tools      0.3.5-1        Media Transfer Protocol (MTP) library tools



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