Arch Linux

The sony-laptop module crashes while setting up the keyboard backlight function on my machine (Sony VPC SE 1V9E).
Used the v3.9.1 kernel from the testing repo - v3.8.0 crashes as well.

Additional info:
* Linux version 3.9.1-1-ARCH (tobias@T-POWA-LX) (gcc version 4.8.0 20130502 (prerelease) (GCC) ) #1 SMP PREEMPT Wed May 8 09:29:17 CEST 2013
* full dmesg as attachement

* sony-laptop related output:
[ 92.714355] sony_laptop: Sony Notebook Control Driver v0.6
[ 92.714534] input: Sony Vaio Keys as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:00/SNY5001:00/input/input11
[ 92.714876] input: Sony Vaio Jogdial as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:00/SNY5001:00/input/input12
[ 92.723121] ------------[ cut here ]------------
[ 92.723126] WARNING: at fs/sysfs/dir.c:536 sysfs_add_one+0xae/0xe0()
[ 92.723127] Hardware name: VPCSE1V9E
[ 92.723128] sysfs: cannot create duplicate filename '/devices/platform/sony-laptop/kbd_backlight'
[ 92.723129] Modules linked in: sony_laptop(+) fuse joydev hid_logitech_dj usbhid hid nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack iptable_filter ip_tables x_tables tpm_infineon uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core videodev media snd_hda_codec_hdmi snd_hda_codec_realtek intel_powerclamp coretemp kvm_intel kvm arc4 iTCO_wdt iTCO_vendor_support iwldvm crc32_pclmul crc32c_intel ghash_clmulni_intel aesni_intel mac80211 aes_x86_64 xts lrw gf128mul ablk_helper cryptd microcode iwlwifi pcspkr cfg80211 r8169 rtsx_pci_ms memstick mii snd_hda_intel rfkill thermal i915 snd_hda_codec snd_hwdep battery snd_pcm tpm_tis button tpm intel_agp snd_page_alloc tpm_bios intel_gtt drm_kms_helper snd_timer drm psmouse mperf snd i2c_i801 i2c_algo_bit serio_raw video processor ac soundcore
[ 92.723165] evdev mei i2c_core lpc_ich ext4 crc16 mbcache jbd2 sd_mod rtsx_pci_sdmmc mmc_core ahci libahci ehci_pci libata ehci_hcd xhci_hcd scsi_mod rtsx_pci usbcore usb_common
[ 92.723176] Pid: 533, comm: modprobe Not tainted 3.9.1-1-ARCH #1
[ 92.723176] Call Trace:
[ 92.723181] [<ffffffff81058090>] warn_slowpath_common+0x70/0xa0
[ 92.723182] [<ffffffff8105810c>] warn_slowpath_fmt+0x4c/0x50
[ 92.723184] [<ffffffff811ff20e>] sysfs_add_one+0xae/0xe0
[ 92.723187] [<ffffffff811fe407>] sysfs_add_file_mode+0x97/0xe0
[ 92.723189] [<ffffffff811fe47a>] sysfs_create_file+0x2a/0x30
[ 92.723192] [<ffffffff813526f9>] device_create_file+0x19/0x20
[ 92.723196] [<ffffffffa03ac734>] sony_nc_add+0x5e4/0x11c8 [sony_laptop]
[ 92.723198] [<ffffffff811ffbcc>] ? sysfs_do_create_link_sd+0xcc/0x220
[ 92.723201] [<ffffffff812daa91>] acpi_device_probe+0x4e/0x10f
[ 92.723203] [<ffffffff81357247>] driver_probe_device+0x87/0x3a0
[ 92.723204] [<ffffffff81357633>] __driver_attach+0x93/0xa0
[ 92.723206] [<ffffffff813575a0>] ? __device_attach+0x40/0x40
[ 92.723208] [<ffffffff81355243>] bus_for_each_dev+0x63/0xa0
[ 92.723210] [<ffffffff81356cce>] driver_attach+0x1e/0x20
[ 92.723212] [<ffffffff81356868>] bus_add_driver+0x1f8/0x2b0
[ 92.723215] [<ffffffffa02a6000>] ? 0xffffffffa02a5fff
[ 92.723216] [<ffffffff81357cc1>] driver_register+0x71/0x150
[ 92.723218] [<ffffffffa02a6000>] ? 0xffffffffa02a5fff
[ 92.723220] [<ffffffff812dafdb>] acpi_bus_register_driver+0x3b/0x43
[ 92.723223] [<ffffffffa02a6059>] sony_laptop_init+0x59/0x8e [sony_laptop]
[ 92.723225] [<ffffffff8100210a>] do_one_initcall+0x10a/0x160
[ 92.723229] [<ffffffff810bdac6>] load_module+0x1b46/0x2640
[ 92.723233] [<ffffffff8128d870>] ? ddebug_proc_write+0xf0/0xf0
[ 92.723235] [<ffffffff810be662>] sys_init_module+0xa2/0xf0
[ 92.723238] [<ffffffff814d959d>] system_call_fastpath+0x1a/0x1f
[ 92.723239] ---[ end trace 13b618ecd0a2a537 ]---
[ 92.723240] sony_laptop: couldn't set up keyboard backlight function (-17)
[ 92.723264] sony_laptop: brightness ignored, must be controlled by ACPI video driver

Steps to reproduce:
sudo modprobe sony-laptop