[fjf]

Definitely, the dmesg changes after plugging the cybook is:

[ 156.414141] usb 7-6: new high speed USB device using ehci_hcd and address 5
[ 156.713842] usb 7-6: new high speed USB device using ehci_hcd and address 6
[ 157.389166] usb 7-6: new high speed USB device using ehci_hcd and address 9
[ 158.063492] usb 7-6: new high speed USB device using ehci_hcd and address 12
[ 158.922672] usb 7-6: new high speed USB device using ehci_hcd and address 16
[ 159.222334] usb 7-6: new high speed USB device using ehci_hcd and address 17
[ 159.709845] usb 7-6: new high speed USB device using ehci_hcd and address 19
[ 160.197357] usb 7-6: new high speed USB device using ehci_hcd and address 21
[ 160.497059] usb 7-6: new high speed USB device using ehci_hcd and address 22
[ 160.985569] usb 7-6: new high speed USB device using ehci_hcd and address 24
[ 161.284272] usb 7-6: new high speed USB device using ehci_hcd and address 25

I am not using a hub, and the problem persists after using any usb connection in my computer.

lsmod output:

Module Size Used by
ipv6 267780 12
xt_limit 3584 8
xt_tcpudp 4096 20
ipt_LOG 7296 8
ipt_MASQUERADE 4608 0
ipt_TOS 3200 0
ipt_REJECT 5632 1
nf_conntrack_irc 7576 0
nf_conntrack_ftp 10144 0
xt_state 3328 6
af_packet 23812 2
binfmt_misc 12808 1
rfcomm 41744 2
l2cap 25728 11 rfcomm
bluetooth 60132 4 rfcomm,l2cap
vboxdrv 60592 0
ppdev 10372 0
acpi_cpufreq 10796 0
cpufreq_userspace 5284 0
cpufreq_ondemand 9740 2
cpufreq_powersave 2688 0
cpufreq_conservative 8712 0
cpufreq_stats 7104 0
freq_table 5536 3 acpi_cpufreq,cpufreq_ondemand,cpufreq_stats
video 19728 0
output 4736 1 video
bay 6912 0
dock 11280 1 bay
container 5632 0
sbs 14984 0
sbshc 7680 1 sbs
ac 6916 0
battery 14084 0
power_supply 9988 3 sbs,ac,battery
sbp2 24072 0
parport_pc 36260 0
lp 12324 0
parport 37832 3 ppdev,parport_pc,lp
snd_hda_intel 295328 1
snd_pcm_oss 42624 0
snd_mixer_oss 17536 1 snd_pcm_oss
snd_pcm 80644 2 snd_hda_intel,snd_pcm_oss
snd_seq_dummy 4740 0
snd_seq_oss 33280 0
snd_seq_midi 9472 0
snd_rawmidi 25600 1 snd_seq_midi
snd_seq_midi_event 8320 2 snd_seq_oss,snd_seq_midi
lmpcm_usb 7168 0
snd_seq 53104 6 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_seq_mid i_event
snd_timer 24324 2 snd_pcm,snd_seq
snd_seq_device 9228 5 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_rawmidi ,snd_seq
serio_raw 7940 0
iTCO_wdt 13092 0
usblp 15872 0
evdev 13056 3
psmouse 40208 0
pcspkr 4224 0
iTCO_vendor_support 4868 1 iTCO_wdt
snd 55172 11 snd_hda_intel,snd_pcm_oss,snd_mixer_oss,snd_pcm,sn d_seq_oss,snd_rawmidi,snd_seq,snd_timer,snd_seq_de vice
nvidia 6223184 34
soundcore 8800 1 snd
snd_page_alloc 11272 2 snd_hda_intel,snd_pcm
i2c_core 24832 1 nvidia
shpchp 34452 0
pci_hotplug 30880 1 shpchp
intel_agp 25364 0
agpgart 34760 2 nvidia,intel_agp
button 9232 0
iptable_nat 8324 0
nf_nat 20396 2 ipt_MASQUERADE,iptable_nat
nf_conntrack_ipv4 18824 8 iptable_nat
nf_conntrack 66496 7 ipt_MASQUERADE,nf_conntrack_irc,nf_conntrack_ftp,x t_state,iptable_nat,nf_nat,nf_conntrack_ipv4
iptable_mangle 3712 0
iptable_filter 3840 1
ip_tables 14820 3 iptable_nat,iptable_mangle,iptable_filter
x_tables 16132 9 xt_limit,xt_tcpudp,ipt_LOG,ipt_MASQUERADE,ipt_TOS, ipt_REJECT,xt_state,iptable_nat,ip_tables
ext3 136840 2
jbd 48404 1 ext3
mbcache 9600 1 ext3
sg 36880 0
sr_mod 17956 0
sd_mod 30592 5
cdrom 37408 1 sr_mod
usbhid 31744 0
hid 38528 1 usbhid
r8169 32772 0
ahci 28292 4
ohci1394 33584 0
ieee1394 93752 2 sbp2,ohci1394
libata 156400 1 ahci
scsi_mod 151308 5 sbp2,sg,sr_mod,sd_mod,libata
ehci_hcd 37004 0
uhci_hcd 27024 0
usbcore 145644 6 lmpcm_usb,usblp,usbhid,ehci_hcd,uhci_hcd
thermal 16796 0
processor 36872 2 acpi_cpufreq,thermal
fan 5380 0
fuse 50580 3

If I use my flash usb drive, it mounts fine and dmesg says:

[ 544.957645] usb 7-6: configuration #1 chosen from 1 choice
[ 545.036153] usbcore: registered new interface driver libusual
[ 545.041264] Initializing USB Mass Storage driver...
[ 545.041314] scsi6 : SCSI emulation for USB Mass Storage devices
[ 545.041358] usbcore: registered new interface driver usb-storage
[ 545.041361] USB Mass Storage support registered.
[ 545.041424] usb-storage: device found at 123
[ 545.041426] usb-storage: waiting for device to settle before scanning
[ 550.031746] usb-storage: device scan complete
[ 550.032252] scsi 6:0:0:0: Direct-Access Generic USB Flash Drive 1.00 PQ: 0 ANSI: 2
[ 550.036980] sd 6:0:0:0: [sdb] 16384001 512-byte hardware sectors (8389 MB)
[ 550.037479] sd 6:0:0:0: [sdb] Write Protect is off
[ 550.037482] sd 6:0:0:0: [sdb] Mode Sense: 03 00 00 00
[ 550.037484] sd 6:0:0:0: [sdb] Assuming drive cache: write through
[ 550.039603] sd 6:0:0:0: [sdb] 16384001 512-byte hardware sectors (8389 MB)
[ 550.040100] sd 6:0:0:0: [sdb] Write Protect is off
[ 550.040103] sd 6:0:0:0: [sdb] Mode Sense: 03 00 00 00
[ 550.040105] sd 6:0:0:0: [sdb] Assuming drive cache: write through
[ 550.040107] sdb: unknown partition table
[ 550.046512] sd 6:0:0:0: [sdb] Attached SCSI removable disk
[ 550.046544] sd 6:0:0:0: Attached scsi generic sg2 type 0

A sudo modprobe scsi_mod or usb_storage has no effect.