screen brightness controls stopped working on ThinkPad W530

["The O.G." <theoriginalguru@xxxxxxxxx>]

Recently, I noticed that the screen brightness controls don't work as usual. Not only that, most of the time it will completely lock up the system requiring a hard reset. If I don't touch the screen brightness controls, the system remains stable. I'm emailing this address because it states so in 'dmesg' :

[    9.137413] thinkpad_acpi: ThinkPad ACPI Extras v0.25
[    9.137415] thinkpad_acpi: http://ibm-acpi.sf.net/
[    9.137416] thinkpad_acpi: ThinkPad BIOS G5ET93WW (2.53 ), EC unknown
[    9.137418] thinkpad_acpi: Lenovo ThinkPad W530, model 2447DV2
[    9.138744] thinkpad_acpi: Unsupported brightness interface, please contact ibm-acpi-devel@xxxxxxxxxxxxxxxxxxxxx
[    9.138855] thinkpad_acpi: radio switch found; radios are enabled
[    9.138866] thinkpad_acpi: This ThinkPad has standard ACPI backlight brightness control, supported by the ACPI video driver
[    9.138867] thinkpad_acpi: Disabling thinkpad-acpi brightness events by default...
[    9.140281] thinkpad_acpi: rfkill switch tpacpi_bluetooth_sw: radio is unblocked

Here's some info about my ThinkPad:

# inxi -Fm
System:    Host: scarlet Kernel: 4.3.4-300.fc23.x86_64 x86_64 (64 bit) Desktop: MATE 1.12.1
           Distro: Fedora release 23 (Twenty Three)
Machine:   System: LENOVO product: 2447DV2 v: ThinkPad W530 serial: XXXXXXX
           Mobo: LENOVO model: 2447DV2 serial: XXXXXXXXXX Bios: LENOVO v: G5ET93WW (2.53 ) date: 05/24/2013
CPU:       Quad core Intel Core i7-3840QM (-HT-MCP-) cache: 8192 KB
           clock speeds: max: 3800 MHz 1: 1199 MHz 2: 1471 MHz 3: 1383 MHz 4: 1380 MHz 5: 1479 MHz 6: 1295 MHz
           7: 1648 MHz 8: 1630 MHz
Memory:    Array-1 capacity: 32 GB devices: 4 EC: None
           Device-1: ChannelA-DIMM0 size: No Module Installed type: N/A
           Device-2: ChannelA-DIMM1 size: 8 GB speed: 1600 MHz type: DDR3
           Device-3: ChannelB-DIMM0 size: 8 GB speed: 1600 MHz type: DDR3
           Device-4: ChannelB-DIMM1 size: No Module Installed type: N/A
Graphics:  Card: NVIDIA GK107GLM [Quadro K2000M]
           Display Server: X.org 1.18.0 driver: nvidia tty size: 126x57 Advanced Data: N/A for root
Audio:     Card-1 Intel 7 Series/C210 Series Family High Definition Audio Controller driver: snd_hda_intel
           Card-2 NVIDIA GK107 HDMI Audio Controller driver: snd_hda_intel
           Sound: Advanced Linux Sound Architecture v: k4.3.4-300.fc23.x86_64
Network:   Card-1: Intel 82579LM Gigabit Network Connection driver: e1000e
           IF: enp0s25 state: up speed: 1000 Mbps duplex: full mac: 3c:97:0e:af:02:85
           Card-2: Intel Centrino Advanced-N 6205 [Taylor Peak] driver: iwlwifi
           IF: wlp3s0 state: down mac: 6c:88:14:ca:3d:c0
Drives:    HDD Total Size: 256.1GB (59.0% used) ID-1: /dev/sda model: SAMSUNG_MZ7TD256 size: 256.1GB
Partition: ID-1: / size: 50G used: 9.5G (19%) fs: xfs dev: /dev/dm-1
           ID-2: /boot size: 477M used: 87M (20%) fs: ext4 dev: /dev/sda1
           ID-3: /home size: 181G used: 124G (69%) fs: xfs dev: /dev/dm-2
           ID-4: swap-1 size: 8.26GB used: 0.00GB (0%) fs: swap dev: /dev/dm-0
RAID:      No RAID devices: /proc/mdstat, md_mod kernel module present
Sensors:   System Temperatures: cpu: 44.0C mobo: N/A gpu: 35C
           Fan Speeds (in rpm): cpu: 1806
Info:      Processes: 245 Uptime: 7 min Memory: 1222.9/15687.1MB Client: Shell (bash) inxi: 2.2.32

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