Canon EOS 550D and USB disconnect after 30 seconds

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Hi,
I'm trying to use my Canon EOS 550D digital camera with kernel 2.6.32,
it seems to be correctly recognized, but I see an USB disconnect after
about 30 seconds. This is the relevant section of dmesg:

[ 1205.408516] usb 1-1: new high speed USB device using ehci_hcd and
address 3
[ 1205.541927] usb 1-1: New USB device found, idVendor=04a9,
idProduct=31ea
[ 1205.541931] usb 1-1: New USB device strings: Mfr=1, Product=2,
SerialNumber=0
[ 1205.541933] usb 1-1: Product: Canon Digital Camera
[ 1205.541935] usb 1-1: Manufacturer: Canon Inc.
[ 1205.542023] usb 1-1: configuration #1 chosen from 1 choice
[ 1234.913526] usb 1-1: USB disconnect, address 3

Using lsusb during the 30 seconds it stays connected seems to give a
reasonable answer:

Bus 001 Device 003: ID 04a9:31ea Canon, Inc.

I captured usbmon output during this phase and you can find attached to
this email.
I also tried with kernel 2.6.37-rc7 but I obtained the same results.

Ciao
Alessio
f5b2d100 2360303075 S Ci:1:001:0 s a3 00 0000 0001 0004 4 <
f5b2d100 2360303082 C Ci:1:001:0 0 4 = 01050100
f5b2d100 2360303083 S Co:1:001:0 s 23 01 0010 0001 0000 0
f5b2d100 2360303086 C Co:1:001:0 0 0
f5b2d100 2360303087 S Ci:1:001:0 s a3 00 0000 0002 0004 4 <
f5b2d100 2360303088 C Ci:1:001:0 0 4 = 00010000
f5b2d100 2360303089 S Ci:1:001:0 s a3 00 0000 0003 0004 4 <
f5b2d100 2360303090 C Ci:1:001:0 0 4 = 00010000
f5b2d100 2360303091 S Ci:1:001:0 s a3 00 0000 0004 0004 4 <
f5b2d100 2360303092 C Ci:1:001:0 0 4 = 00010000
f5b2d100 2360303093 S Ci:1:001:0 s a3 00 0000 0005 0004 4 <
f5b2d100 2360303094 C Ci:1:001:0 0 4 = 00010000
f5b2d100 2360303095 S Ci:1:001:0 s a3 00 0000 0006 0004 4 <
f5b2d100 2360303097 C Ci:1:001:0 0 4 = 00010000
f658ee00 2360406570 S Ii:1:001:1 -115:2048 4 <
f5b2d100 2360406582 S Ci:1:001:0 s a3 00 0000 0001 0004 4 <
f5b2d100 2360406584 C Ci:1:001:0 0 4 = 01050000
f5b2d100 2360406590 S Co:1:001:0 s 23 03 0004 0001 0000 0
f5b2d100 2360406592 C Co:1:001:0 0 0
f5b2d100 2360462573 S Ci:1:001:0 s a3 00 0000 0001 0004 4 <
f5b2d100 2360462838 C Ci:1:001:0 0 4 = 03051000
f5b2d100 2360519073 S Co:1:001:0 s 23 01 0014 0001 0000 0
f5b2d100 2360519077 C Co:1:001:0 0 0
f5b2d100 2360519084 S Ci:1:000:0 s 80 06 0100 0000 0040 64 <
f5b2d100 2360519468 C Ci:1:000:0 0 18 = 12010002 00000040 a904ea31 02000102 0001
f5b2d100 2360519475 S Co:1:001:0 s 23 03 0004 0001 0000 0
f5b2d100 2360519478 C Co:1:001:0 0 0
f5b2d100 2360575072 S Ci:1:001:0 s a3 00 0000 0001 0004 4 <
f5b2d100 2360575338 C Ci:1:001:0 0 4 = 03051000
f5b2d100 2360631071 S Co:1:001:0 s 23 01 0014 0001 0000 0
f5b2d100 2360631074 C Co:1:001:0 0 0
f5b2d100 2360631075 S Co:1:000:0 s 00 05 0003 0000 0000 0
f5b2d100 2360631094 C Co:1:000:0 0 0
f5b2d100 2360650570 S Ci:1:003:0 s 80 06 0100 0000 0012 18 <
f5b2d100 2360650970 C Ci:1:003:0 0 18 = 12010002 00000040 a904ea31 02000102 0001
f5b2d100 2360650977 S Ci:1:003:0 s 80 06 0200 0000 0009 9 <
f5b2d100 2360651220 C Ci:1:003:0 0 9 = 09022700 010100c0 01
f5b2d100 2360651245 S Ci:1:003:0 s 80 06 0200 0000 0027 39 <
f5b2d100 2360651594 C Ci:1:003:0 0 39 = 09022700 010100c0 01090400 00030601 01000705 81020002 00070502 02000200
f5b2d100 2360651601 S Ci:1:003:0 s 80 06 0300 0000 00ff 255 <
f5b2d100 2360651844 C Ci:1:003:0 0 4 = 04030904
f5b2d100 2360651863 S Ci:1:003:0 s 80 06 0302 0409 00ff 255 <
f5b2d100 2360652095 C Ci:1:003:0 0 42 = 2a034300 61006e00 6f006e00 20004400 69006700 69007400 61006c00 20004300
f5b2d100 2360652099 S Ci:1:003:0 s 80 06 0301 0409 00ff 255 <
f5b2d100 2360652470 C Ci:1:003:0 0 22 = 16034300 61006e00 6f006e00 20004900 6e006300 2e00
f5b2d100 2360652590 S Co:1:003:0 s 00 09 0001 0000 0000 0
f5b2d100 2360652720 C Co:1:003:0 0 0
f658ee00 2390024022 C Ii:1:001:1 0:2048 1 = 02
f658ee00 2390024026 S Ii:1:001:1 -115:2048 4 <
f59e7580 2390024079 S Ci:1:001:0 s a3 00 0000 0001 0004 4 <
f59e7580 2390024083 C Ci:1:001:0 0 4 = 00010100
f59e7580 2390024084 S Co:1:001:0 s 23 01 0010 0001 0000 0
f59e7580 2390024087 C Co:1:001:0 0 0
f59e7580 2390024291 S Ci:1:001:0 s a3 00 0000 0001 0004 4 <
f59e7580 2390024293 C Ci:1:001:0 0 4 = 00010000
f5875700 2390054572 S Ci:1:001:0 s a3 00 0000 0001 0004 4 <
f5875700 2390054576 C Ci:1:001:0 0 4 = 00010000
f5875700 2390087070 S Ci:1:001:0 s a3 00 0000 0001 0004 4 <
f5875700 2390087073 C Ci:1:001:0 0 4 = 00010000
f5875700 2390119068 S Ci:1:001:0 s a3 00 0000 0001 0004 4 <
f5875700 2390119071 C Ci:1:001:0 0 4 = 00010000
f5875700 2390150572 S Ci:1:001:0 s a3 00 0000 0001 0004 4 <
f5875700 2390150575 C Ci:1:001:0 0 4 = 00010000
f658ee00 2393098576 C Ii:1:001:1 -2:2048 0

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