I'm using Debian with i3 window manager and was able to adjust the display brightness of a Lenovo ThinkPad X201 with the following ~/.i3/config under Debian9:
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##Screen brightness controls (Pos1/End), needs "apt install xbacklight"
bindsym XF86MonBrightnessUp exec xbacklight -inc 10
bindsym XF86MonBrightnessDown exec xbacklight -dec 10
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$ inxi -F
System: Host: x201 Kernel: 4.19.0-6-amd64 x86_64 bits: 64 Desktop: i3 4.16.1
Distro: Debian GNU/Linux 10 (buster)
Machine: Type: Laptop System: LENOVO product: 4492BD2 v: ThinkPad X201 serial: <root required>
Mobo: LENOVO model: 4492BD2 serial: <root required> BIOS: LENOVO v: 6QET70WW (1.40 ) date: 10/11/2012
Battery: ID-1: BAT0 charge: 19.6 Wh condition: 19.6/71.3 Wh (27%)
CPU: Topology: Dual Core model: Intel Core i5 M 560 bits: 64 type: MT MCP L2 cache: 3072 KiB
Speed: 1270 MHz min/max: 1199/2667 MHz Core speeds (MHz): 1: 1274 2: 1260 3: 1261 4: 1270
Graphics: Device-1: Intel Core Processor Integrated Graphics driver: i915 v: kernel
Display: x11 server: X.Org 1.20.4 driver: modesetting unloaded: intel
resolution: 1280x800~60Hz, 1280x1024~60Hz, 1280x1024~60Hz
OpenGL: renderer: Mesa DRI Intel Ironlake Mobile v: 2.1 Mesa 18.3.6
Audio: Device-1: Intel 5 Series/3400 Series High Definition Audio driver: snd_hda_intel
Sound Server: ALSA v: k4.19.0-6-amd64
Network: Device-1: Intel 82577LM Gigabit Network driver: e1000e
IF: enp0s25 state: up speed: 1000 Mbps duplex: full mac: ...
Device-2: Intel Centrino Advanced-N 6200 driver: iwlwifi
IF: wlp2s0 state: up mac: ...
IF-ID-1: docker0 state: down mac: ...
Drives: Local Storage: total: 111.79 GiB used: 196.33 GiB (175.6%)
ID-1: /dev/sda vendor: OCZ model: VECTOR180 size: 111.79 GiB
Partition: ID-1: / size: 105.18 GiB used: 97.95 GiB (93.1%) fs: ext4 dev: /dev/dm-1
ID-2: /boot size: 235.3 MiB used: 87.6 MiB (37.2%) fs: ext2 dev: /dev/sda1
ID-3: swap-1 size: 4.56 GiB used: 353.8 MiB (7.6%) fs: swap dev: /dev/dm-2
Sensors: System Temperatures: cpu: 63.0 C mobo: 0.0 C
Fan Speeds (RPM): cpu: 3759
Info: Processes: 247 Uptime: 3d 15h 40m Memory: 7.59 GiB used: 4.77 GiB (62.8%) Shell: bash inxi: 3.0.32
$
Any idea what could be the reason for this or should I ask the i3 developers?
Edit: replaced "Debian9" by "Debian10"