dmesg

[11461.847873] usbcore: registered new interface driver usb_pkk_backlight
[11474.072751] usb 3-2: new full-speed USB device number 2 using xhci_hcd
[11474.094277] usb 3-2: New USB device found, idVendor=04d8, idProduct=c002
[11474.094288] usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[11474.094293] usb 3-2: Product: USB-LCD-256x64
[11479.097334] USB PKK-BL Driver: Hardware probe...
[11479.097343] USB PKK-BL Driver: Backlight device initialization...
[11479.097379] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[11479.097536] IP: [<ffffffffa07c8225>] pkk_bl_probe+0x85/0x257 [usb_pkk_backlight]
[11479.097630] PGD 0
[11479.097660] Oops: 0000 [#1] SMP
[11479.097709] Modules linked in: usb_pkk_backlight(OF) ctr ccm snd_hrtimer pci_stub vboxpci(OF) vboxnetadp(OF) vboxnetflt(OF) vboxdrv(OF) rfcomm bnep snd_hda_codec_hdmi snd_hda_codec_realtek binfmt_misc btusb bluetooth snd_hda_intel uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core videodev snd_hda_codec snd_hwdep rts5139(C) asus_nb_wmi snd_pcm asus_wmi snd_page_alloc sparse_keymap snd_seq_midi snd_seq_midi_event arc4 snd_rawmidi intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp iwldvm mac80211 kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw snd_seq gf128mul glue_helper ablk_helper cryptd snd_seq_device snd_timer snd i915 lpc_ich iwlwifi joydev cfg80211 serio_raw soundcore drm_kms_helper drm mei_me mei i2c_algo_bit wmi mac_hid video parport_pc ppdev lp parport psmouse ahci libahci
[11479.098845] CPU: 2 PID: 43 Comm: khubd Tainted: GF        C O 3.13.0-32-generic #57-Ubuntu
[11479.098933] Hardware name: ASUSTeK COMPUTER INC. UX31A/UX31A, BIOS UX31A.218 01/31/2013
[11479.099018] task: ffff880118ad47d0 ti: ffff880118522000 task.ti: ffff880118522000
[11479.099097] RIP: 0010:[<ffffffffa07c8225>]  [<ffffffffa07c8225>] pkk_bl_probe+0x85/0x257 [usb_pkk_backlight]
[11479.099207] RSP: 0018:ffff880118523930  EFLAGS: 00010296
[11479.099265] RAX: 0000000000000035 RBX: ffff880020291980 RCX: 0000000000000006
[11479.099345] RDX: 0000000000000007 RSI: 0000000000000046 RDI: 0000000000000246
[11479.099420] RBP: ffff880118523978 R08: 0000000000000082 R09: 00000000000004e1
[11479.099495] R10: 0000000000000000 R11: ffff88011852365e R12: 0000000000000000
[11479.099570] R13: ffff880101d3c088 R14: ffff880101d3c000 R15: ffff88000f542400
[11479.099647] FS:  0000000000000000(0000) GS:ffff88011ef00000(0000) knlGS:0000000000000000
[11479.099732] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[11479.099794] CR2: 0000000000000080 CR3: 0000000001c0e000 CR4: 00000000001407e0
[11479.099869] Stack:
[11479.099893]  0000000000000030 ffff880118523978 ffffffff814a0152 ffff880114f80c00
[11479.099988]  ffff880101d3c088 ffff880101d3c000 ffffffffa07ca068 ffff88000f542430
[11479.100081]  ffffffffa07ca100 ffff8801185239c0 ffffffff815471c4 0000000018523998
[11479.100175] Call Trace:
[11479.100216]  [<ffffffff814a0152>] ? __pm_runtime_set_status+0x132/0x210
[11479.100293]  [<ffffffff815471c4>] usb_probe_interface+0x1c4/0x2f0
[11479.100363]  [<ffffffff8149355d>] driver_probe_device+0x12d/0x3e0
[11479.100430]  [<ffffffff81493810>] ? driver_probe_device+0x3e0/0x3e0
[11479.100499]  [<ffffffff8149384b>] __device_attach+0x3b/0x40
[11479.100566]  [<ffffffff81491583>] bus_for_each_drv+0x63/0xa0
[11479.100630]  [<ffffffff814933b8>] device_attach+0x88/0xa0
[11479.100691]  [<ffffffff814927c8>] bus_probe_device+0x98/0xc0
[11479.100757]  [<ffffffff81490625>] device_add+0x4c5/0x640
[11479.100818]  [<ffffffff815451db>] usb_set_configuration+0x4fb/0x810
[11479.100890]  [<ffffffff8154f54e>] generic_probe+0x2e/0xa0
[11479.100939]  [<ffffffff81546fb2>] usb_probe_device+0x32/0x80
[11479.101000]  [<ffffffff8149355d>] driver_probe_device+0x12d/0x3e0
[11479.101049]  [<ffffffff81493810>] ? driver_probe_device+0x3e0/0x3e0
[11479.101099]  [<ffffffff8149384b>] __device_attach+0x3b/0x40
[11479.101146]  [<ffffffff81491583>] bus_for_each_drv+0x63/0xa0
[11479.101193]  [<ffffffff814933b8>] device_attach+0x88/0xa0
[11479.101236]  [<ffffffff814927c8>] bus_probe_device+0x98/0xc0
[11479.101315]  [<ffffffff81490625>] device_add+0x4c5/0x640
[11479.101407]  [<ffffffff815397f8>] usb_new_device+0x268/0x430
[11479.101473]  [<ffffffff8153bee0>] hub_port_connect_change+0x5c0/0xb50
[11479.101546]  [<ffffffff8153c934>] hub_events+0x4c4/0xa20
[11479.101608]  [<ffffffff8153cec5>] hub_thread+0x35/0x160
[11479.101673]  [<ffffffff810aaf00>] ? prepare_to_wait_event+0x100/0x100
[11479.101745]  [<ffffffff8153ce90>] ? hub_events+0xa20/0xa20
[11479.101809]  [<ffffffff8108b3d2>] kthread+0xd2/0xf0
[11479.101866]  [<ffffffff8108b300>] ? kthread_create_on_node+0x1d0/0x1d0
[11479.101942]  [<ffffffff8172c5bc>] ret_from_fork+0x7c/0xb0
[11479.102004]  [<ffffffff8108b300>] ? kthread_create_on_node+0x1d0/0x1d0
[11479.102073] Code: 30 48 89 c6 e8 0d ad cc e0 4c 89 23 4c 8b 63 10 48 c7 c7 68 92 7c a0 31 c0 4c 89 73 08 49 8d 74 24 30 48 89 75 b8 e8 4a d7 f4 e0 <49> 8b bc 24 80 00 00 00 48 c7 45 c0 00 00 00 00 48 c7 45 d0 00
[11479.102551] RIP  [<ffffffffa07c8225>] pkk_bl_probe+0x85/0x257 [usb_pkk_backlight]
[11479.102653]  RSP <ffff880118523930>
[11479.102692] CR2: 0000000000000080
[11479.129863] ---[ end trace 715082aa6ab28741 ]---