The keyboard backlight control (Fn+F9) doesn't work on Mint, but it works on Windows 10 (both OS installed on my Samsung laptop). Does anyone know how to fix this? Or at least help me keep the keyboard backlight always on?
PS: the Fn+F2/F3 works fine to control the screen brightness. Fn+F7/F8 works fine to control the volume too.
When the keyboard backlight is ON (because I turned it on from Windows) I see:
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xxd -p /sys/firmware/efi/efivars/KBDBacklitLvl-5af56f53-985c-47d5-920c-f1c531d06852
0700000003
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xxd -p /sys/firmware/efi/efivars/KBDBacklitLvl-5af56f53-985c-47d5-920c-f1c531d06852
0700000000
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lsattr /sys/firmware/efi/efivars/KBDBacklitLvl-5af56f53-985c-47d5-920c-f1c531d06852
chattr -i /sys/firmware/efi/efivars/KBDBacklitLvl-5af56f53-985c-47d5-920c-f1c531d06852
lsattr /sys/firmware/efi/efivars/KBDBacklitLvl-5af56f53-985c-47d5-920c-f1c531d06852
echo 0700000003 | xxd -p -r > /sys/firmware/efi/efivars/KBDBacklitLvl-5af56f53-985c-47d5-920c-f1c531d06852
chattr +i /sys/firmware/efi/efivars/KBDBacklitLvl-5af56f53-985c-47d5-920c-f1c531d06852
xxd -p /sys/firmware/efi/efivars/KBDBacklitLvl-5af56f53-985c-47d5-920c-f1c531d06852
0700000003
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inxi -Fxxxza
System: Kernel: 5.4.0-74-generic x86_64 bits: 64 compiler: gcc v: 9.3.0
parameters: BOOT_IMAGE=/boot/vmlinuz-5.4.0-74-generic root=UUID=c37c02ce-9aee-42e9-975c-460560e9a166 ro quiet splash
Desktop: Cinnamon 4.6.7 wm: muffin 4.6.3 dm: LightDM 1.30.0 Distro: Linux Mint 20 Ulyana base: Ubuntu 20.04 focal
Machine: Type: Laptop System: SAMSUNG product: 750XBE/730XBE v: P03REY serial: <filter> Chassis: type: 10 serial: <filter>
Mobo: SAMSUNG model: NP730XBE-KP1BR v: SGLA207A06-C01-G002-S0001+10.0.18362 serial: <filter>
UEFI: American Megatrends v: P03REY.055.200422.ZW date: 04/22/2020
Battery: ID-1: BAT1 charge: 34.9 Wh condition: 52.9/55.2 Wh (96%) volts: 11.7/11.5
model: SAMSUNG Electronics SR Real Battery type: Li-ion serial: <filter> status: Discharging cycles: 63
CPU: Topology: Dual Core model: Intel Core i3-8145U bits: 64 type: MT MCP arch: Kaby Lake family: 6 model-id: 8E (142)
stepping: B (11) microcode: EA L1 cache: 128 KiB L2 cache: 4096 KiB L3 cache: 4096 KiB
flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 18399
Speed: 754 MHz min/max: 400/3900 MHz Core speeds (MHz): 1: 700 2: 700 3: 700 4: 700
Vulnerabilities: Type: itlb_multihit status: KVM: Split huge pages
Type: l1tf status: Not affected
Type: mds mitigation: Clear CPU buffers; SMT vulnerable
Type: meltdown status: Not affected
Type: spec_store_bypass mitigation: Speculative Store Bypass disabled via prctl and seccomp
Type: spectre_v1 mitigation: usercopy/swapgs barriers and __user pointer sanitization
Type: spectre_v2 mitigation: Full generic retpoline, IBPB: conditional, IBRS_FW, STIBP: conditional, RSB filling
Type: srbds mitigation: Microcode
Type: tsx_async_abort status: Not affected
Graphics: Device-1: Intel UHD Graphics 620 vendor: Samsung Co driver: i915 v: kernel bus ID: 00:02.0 chip ID: 8086:3ea0
Display: server: X.Org 1.20.9 driver: modesetting unloaded: fbdev,vesa resolution: 1600x900~60Hz
OpenGL: renderer: Mesa Intel UHD Graphics 620 (WHL GT2) v: 4.6 Mesa 20.2.6 direct render: Yes
Audio: Device-1: Intel Cannon Point-LP High Definition Audio vendor: Samsung Co driver: snd_hda_intel v: kernel
bus ID: 00:1f.3 chip ID: 8086:9dc8
Sound Server: ALSA v: k5.4.0-74-generic
Network: Device-1: Intel Cannon Point-LP CNVi [Wireless-AC] driver: iwlwifi v: kernel port: 3000 bus ID: 00:14.3
chip ID: 8086:9df0
IF: wlo1 state: up mac: <filter>
Drives: Local Storage: total: 238.47 GiB used: 84.15 GiB (35.3%)
SMART Message: Required tool smartctl not installed. Check --recommends
ID-1: /dev/sda vendor: LITE-ON model: CV8-8E256 size: 238.47 GiB block size: physical: 512 B logical: 512 B
speed: 6.0 Gb/s serial: <filter> rev: 002 scheme: GPT
RAID: Hardware-1: Intel 82801 Mobile SATA Controller [RAID mode] driver: ahci v: 3.0 port: 3060 bus ID: 00:17.0
chip ID: 8086.282a rev: 11
Partition: ID-1: / raw size: 22.35 GiB size: 21.88 GiB (97.87%) used: 15.08 GiB (68.9%) fs: ext4 block size: 4096 B
dev: /dev/sda7
ID-2: /home raw size: 98.05 GiB size: 96.01 GiB (97.92%) used: 69.01 GiB (71.9%) fs: ext4 block size: 4096 B
dev: /dev/sda9
ID-3: swap-1 size: 3.82 GiB used: 13.0 MiB (0.3%) fs: swap swappiness: 60 (default) cache pressure: 100 (default)
dev: /dev/sda8
Sensors: System Temperatures: cpu: 46.0 C mobo: 46.0 C
Fan Speeds (RPM): N/A
Info: Processes: 243 Uptime: 40m Memory: 3.74 GiB used: 2.34 GiB (62.7%) Init: systemd v: 245 runlevel: 5 Compilers:
gcc: 9.3.0 alt: 9 Shell: bash (sudo) v: 5.0.17 running in: gnome-terminal inxi: 3.0.38