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zrovna řeším podobný problém s připojením foáku HP Photosmart M407 - jen s tím rozdílem, že po dmesg naleznu následující:

usb 4-2: new full speed USB device using address 2
Initializing USB Mass Storage driver...
scsi0 : SCSI emulation for USB Mass Storage devices
  Vendor: HP        Model: PhotoSmart M407   Rev: No.1
  Type:   Direct-Access                      ANSI SCSI revision: 02
Attached scsi generic sg0 at scsi0, channel 0, id 0, lun 0,  type 0
USB Mass Storage device found at 2
usbcore: registered new driver usb-storage
USB Mass Storage support registered.
SCSI device sda: 501662 512-byte hdwr sectors (257 MB)
sda: Write Protect is off
sda: Mode Sense: 87 00 00 08
sda: assuming drive cache: write through
 sda:<6>scsi: Device offlined - not ready after error recovery: host 0 channel 0 id 0 lun 0
SCSI error : <0 0 0 0> return code = 0x50000
end_request: I/O error, dev sda, sector 501656
Buffer I/O error on device sda, logical block 250828
scsi0 (0:0): rejecting I/O to offline device
Buffer I/O error on device sda, logical block 250829
Buffer I/O error on device sda, logical block 250830
scsi0 (0:0): rejecting I/O to offline device
Buffer I/O error on device sda, logical block 250828
Buffer I/O error on device sda, logical block 250829
Buffer I/O error on device sda, logical block 250830
 unknown partition table
Attached scsi removable disk sda at scsi0, channel 0, id 0, lun 0

v /proc/partition se mi pak objeví dostupná /dev/sda , ale pokus o namountování zkolabuje.

Po odpojení foťáku následuje další hlášení:

usb 4-2: USB disconnect, address 2
slab error in kmem_cache_destroy(): cache `scsi_cmd_cache': Can't free all objects
 [<0214bb16>] kmem_cache_destroy+0x97/0x11c
 [<129267d0>] scsi_destroy_command_freelist+0x75/0x86 [scsi_mod]
 [<12927b7a>] scsi_host_dev_release+0x88/0xa2 [scsi_mod]
 [<02243c51>] device_release+0x11/0x40
 [<021dcbf2>] kobject_cleanup+0x40/0x60
 [<021dcc12>] kobject_release+0x0/0x8
 [<021dcefd>] kref_put+0x5b/0x5e
 [<12a96bd1>] usb_stor_release_resources+0x1bb/0x1dc [usb_storage]
 [<12a96ec4>] storage_disconnect+0x69/0x71 [usb_storage]
 [<0227dc2e>] usb_unbind_interface+0x2c/0x50
 [<02244ade>] device_release_driver+0x3c/0x46
 [<02244cc0>] bus_remove_device+0x5c/0x95
 [<02243f10>] device_del+0x6d/0x8e
 [<02285403>] usb_disable_device+0x60/0xc8
 [<0227fed8>] usb_disconnect+0xc2/0x21c
 [<02280fa8>] hub_port_connect_change+0x5d/0x4f2
 [<022817c7>] hub_events+0x38a/0x43b
 [<02281878>] hub_thread+0x0/0xe5
 [<02281897>] hub_thread+0x1f/0xe5
 [<0211d29b>] autoremove_wake_function+0x0/0x2d
 [<02281878>] hub_thread+0x0/0xe5
 [<0211d29b>] autoremove_wake_function+0x0/0x2d
 [<021041d9>] kernel_thread_helper+0x5/0xb

a po znovupřipojení se však již nepodaří navázat komunikaci mezi PC a foťákem

usb 4-2: new full speed USB device using address 3
kmem_cache_create: duplicate cache scsi_cmd_cache
------------[ cut here ]------------
kernel BUG at mm/slab.c:1453!
invalid operand: 0000 [#1]
Modules linked in: vfat fat sd_mod usb_storage snd_pcm_oss
 snd_mixer_oss snd_ens1371 snd_rawmidi snd_seq_device
 snd_pcm snd_timer snd_page_alloc snd_ac97_codec snd
 gameport soundcore ipt_MASQUERADE iptable_nat
 ip_conntrack ip_tables parport_pc lp parport autofs4
 sunrpc 3c59x floppy sg scsi_mod md5 ipv6 dm_mod usblp
 uhci_hcd ehci_hcd button battery ac ext3 jbd
CPU:    0
EIP:    0060:[<0214b5ec>]    Not tainted VLI
EFLAGS: 00010202   (2.6.9-1.6_FC2) 
EIP is at kmem_cache_create+0x407/0x486
eax: 023222c5   ebx: 11cf5f60   ecx: 0240da80   edx: 12930d51
esi: 12930d60   edi: 12930d60   ebp: 116ec188   esp: 0332ddd8
ds: 007b   es: 007b   ss: 0068
Process khubd (pid: 20, threadinfo=0332d000 task=03313190)
Stack: ffffffff 12930d51 000000c0 0ee4f800 12941540
 12941580 0ee4f824 129266e6 
       00002000 00000000 00000000 00000006 0332de34
 0ee4f870 0ee4f800 12927dfa 
       12aa1800 1d244b3c 00000000 0000000a 12931064
 00000000 00000000 11fc9c00 
Call Trace:
 [<129266e6>] scsi_setup_command_freelist+0x92/0x107 [scsi_mod]
 [<12927dfa>] scsi_host_alloc+0x266/0x32f [scsi_mod]
 [<12a969ad>] usb_stor_acquire_resources+0x95/0xfe [usb_storage]
 [<12a96df9>] storage_probe+0x1b3/0x215 [usb_storage]
 [<021801db>] dput+0x33/0x4f3
 [<0227dbfa>] usb_probe_interface+0x48/0x50
 [<022449a3>] bus_match+0x27/0x45
 [<022449fe>] device_attach+0x3d/0x77
 [<02244c2d>] bus_add_device+0x62/0x99
 [<02243de6>] device_add+0x71/0x102
 [<022859dd>] usb_set_configuration+0x2ec/0x33b
 [<0228017c>] usb_new_device+0xb3/0x10f
 [<022812b9>] hub_port_connect_change+0x36e/0x4f2
 [<022817c7>] hub_events+0x38a/0x43b
 [<02281878>] hub_thread+0x0/0xe5
 [<02281897>] hub_thread+0x1f/0xe5
 [<0211d29b>] autoremove_wake_function+0x0/0x2d
 [<02281878>] hub_thread+0x0/0xe5
 [<0211d29b>] autoremove_wake_function+0x0/0x2d
 [<021041d9>] kernel_thread_helper+0x5/0xb
Code: eb 04 19 c0 0c 01 85 c0 75 29 ff 74 24 04 68 c5 22
 32 02 e8 7e 4f fd ff 58 b9 80 da 40 02 5a ff 05 80 da 40
 02 0f 8e ee 1d 00 00 <0f> 0b ad 05 10 22 32 02 8b 6d 00
 8b 45 00 0f 18 00 90 81 fd a8 

Zatím jsem ještě neměl tolik času se tím podrobněji zajímat (foťák v režimu PTP (digital camera) ve spojení s programem GTKAM funguje bez problémů), ale neřešil již někdo tento problém??

Díky a hezké vánoce