Fn brightness buttons on laptop do not work

The brightness change buttons on the laptop keyboard do not work. The brightness is changing using the slider in the kde plasma and using commands in terminal, only buttons on the keyboard do not work (f2, f3). but when I launch system settings and go to the input devices section everything starts working until I close the system settings app, how to fix it?

Welcome to the forum! :wave:

Please post your system info as outlined here:

System:    Kernel: 5.13.11-1-MANJARO x86_64 bits: 64 compiler: gcc v: 11.1.0 
           Desktop: KDE Plasma 5.22.4 tk: Qt 5.15.2 wm: kwin_x11 vt: 1 dm: SDDM 
           Distro: Manjaro Linux base: Arch Linux 
Machine:   Type: Laptop System: HP product: HP Pavilion Gaming Laptop 15-dk0xxx 
           v: Type1ProductConfigId serial: <filter> Chassis: type: 10 serial: <filter> 
           Mobo: HP model: 85FB v: 42.34 serial: <filter> UEFI: Insyde v: F.20 date: 11/22/2019 
Battery:   ID-1: BAT1 charge: 36.2 Wh (89.6%) condition: 40.4/52.5 Wh (76.9%) volts: 12.9 min: 11.6 
           model: Hewlett-Packard PABAS0241231 type: Li-ion serial: <filter> status: Charging 
Memory:    RAM: total: 7.61 GiB used: 2.03 GiB (26.6%) 
           RAM Report: permissions: Unable to run dmidecode. Root privileges required. 
CPU:       Info: Quad Core model: Intel Core i5-9300H bits: 64 type: MT MCP arch: Kaby Lake 
           note: check rev: A cache: L2: 8 MiB bogomips: 38408 
           Speed: 800 MHz min/max: 800/4100 MHz Core speeds (MHz): 1: 800 2: 800 3: 800 4: 800 
           5: 800 6: 800 7: 800 8: 800 
           Flags: 3dnowprefetch abm acpi adx aes aperfmperf apic arat arch_perfmon art avx avx2 
           bmi1 bmi2 bts clflush clflushopt cmov constant_tsc cpuid cpuid_fault cx16 cx8 de ds_cpl 
           dtes64 dtherm dts epb ept ept_ad erms est f16c flexpriority flush_l1d fma fpu fsgsbase 
           fxsr ht hwp hwp_act_window hwp_epp hwp_notify ibpb ibrs ida intel_pt invpcid 
           invpcid_single lahf_lm lm mca mce md_clear mmx monitor movbe mpx msr mtrr nonstop_tsc 
           nopl nx pae pat pbe pcid pclmulqdq pdcm pdpe1gb pebs pge pln pni popcnt pse pse36 pti 
           pts rdrand rdseed rdtscp rep_good sdbg sep smap smep ss ssbd sse sse2 sse4_1 sse4_2 
           ssse3 stibp syscall tm tm2 tpr_shadow tsc tsc_adjust tsc_deadline_timer vme vmx vnmi 
           vpid x2apic xgetbv1 xsave xsavec xsaveopt xsaves xtopology xtpr 
Graphics:  Device-1: Intel CoffeeLake-H GT2 [UHD Graphics 630] vendor: Hewlett-Packard driver: i915 
           v: kernel bus-ID: 00:02.0 chip-ID: 8086:3e9b class-ID: 0300 
           Device-2: NVIDIA TU116M [GeForce GTX 1660 Ti Mobile] vendor: Hewlett-Packard 
           driver: nvidia v: 470.63.01 bus-ID: 01:00.0 chip-ID: 10de:2191 class-ID: 0300 
           Device-3: Quanta HP Wide Vision HD Camera type: USB driver: uvcvideo bus-ID: 1-5:2 
           chip-ID: 0408:5300 class-ID: 0e02 serial: <filter> 
           Display: x11 server: X.Org 1.20.13 compositor: kwin_x11 driver: loaded: modesetting 
           unloaded: intel alternate: fbdev,vesa resolution: 1920x1080~60Hz s-dpi: 96 
           OpenGL: renderer: Mesa Intel UHD Graphics 630 (CFL GT2) v: 4.6 Mesa 21.1.6 
           direct render: Yes 
Audio:     Device-1: Intel Cannon Lake PCH cAVS vendor: Hewlett-Packard driver: snd_hda_intel 
           v: kernel bus-ID: 00:1f.3 chip-ID: 8086:a348 class-ID: 0403 
           Device-2: NVIDIA TU116 High Definition Audio vendor: Hewlett-Packard 
           driver: snd_hda_intel v: kernel bus-ID: 01:00.1 chip-ID: 10de:1aeb class-ID: 0403 
           Sound Server-1: ALSA v: k5.13.11-1-MANJARO running: yes 
           Sound Server-2: sndio v: N/A running: no 
           Sound Server-3: JACK v: 1.9.19 running: no 
           Sound Server-4: PulseAudio v: 15.0 running: yes 
           Sound Server-5: PipeWire v: 0.3.33 running: yes 
Network:   Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: Hewlett-Packard 
           driver: r8169 v: kernel port: 4000 bus-ID: 03:00.0 chip-ID: 10ec:8168 class-ID: 0200 
           IF: eno1 state: down mac: <filter> 
           Device-2: Realtek RTL8822BE 802.11a/b/g/n/ac WiFi adapter vendor: Hewlett-Packard 
           driver: rtw_8822be v: N/A port: 3000 bus-ID: 05:00.0 chip-ID: 10ec:b822 class-ID: 0280 
           IF: wlo1 state: up mac: <filter> 
           IP v4: <filter> type: dynamic noprefixroute scope: global broadcast: <filter> 
           IP v6: <filter> type: noprefixroute scope: link 
           WAN IP: <filter> 
Bluetooth: Device-1: Realtek Realtek Bluetooth 4.2 Adapter type: USB driver: btusb v: 0.8 
           bus-ID: 1-14:3 chip-ID: 0bda:b00b class-ID: e001 serial: <filter> 
           Report: rfkill ID: hci0 rfk-id: 1 state: down bt-service: enabled,running rfk-block: 
           hardware: no software: yes address: see --recommends 
Logical:   Message: No logical block device data found. 
RAID:      Hardware-1: Intel 82801 Mobile SATA Controller [RAID mode] driver: ahci v: 3.0 
           port: 6060 bus-ID: 00:17.0 chip-ID: 8086.282a rev: 10 class-ID: 0104 
Drives:    Local Storage: total: 238.47 GiB used: 71.8 GiB (30.1%) 
           ID-1: /dev/nvme0n1 vendor: KIOXIA model: N/A size: 238.47 GiB speed: 15.8 Gb/s lanes: 2 
           type: SSD serial: <filter> rev: ADHA0102 temp: 40.9 C scheme: GPT 
           Message: No optical or floppy data found. 
Partition: ID-1: / size: 229.37 GiB used: 71.8 GiB (31.3%) fs: btrfs dev: /dev/nvme0n1p2 label: N/A 
           uuid: a8138b61-f4bc-4d17-b2b4-0e6c28e0b6f2 
           ID-2: /boot/efi size: 299.4 MiB used: 568 KiB (0.2%) fs: vfat dev: /dev/nvme0n1p1 
           label: NO_LABEL uuid: C3B1-9F8E 
           ID-3: /home size: 229.37 GiB used: 71.8 GiB (31.3%) fs: btrfs dev: /dev/nvme0n1p2 
           label: N/A uuid: a8138b61-f4bc-4d17-b2b4-0e6c28e0b6f2 
           ID-4: /run/timeshift/backup size: 229.37 GiB used: 71.8 GiB (31.3%) fs: btrfs 
           dev: /dev/nvme0n1p2 label: N/A uuid: a8138b61-f4bc-4d17-b2b4-0e6c28e0b6f2 
           ID-5: /var/cache size: 229.37 GiB used: 71.8 GiB (31.3%) fs: btrfs dev: /dev/nvme0n1p2 
           label: N/A uuid: a8138b61-f4bc-4d17-b2b4-0e6c28e0b6f2 
           ID-6: /var/log size: 229.37 GiB used: 71.8 GiB (31.3%) fs: btrfs dev: /dev/nvme0n1p2 
           label: N/A uuid: a8138b61-f4bc-4d17-b2b4-0e6c28e0b6f2 
Swap:      ID-1: swap-1 type: partition size: 8.8 GiB used: 0 KiB (0.0%) priority: -2 
           dev: /dev/nvme0n1p3 label: swap uuid: 1aec63ac-3282-4c3c-8407-e1964d2da303 
Unmounted: Message: No unmounted partitions found. 
USB:       Hub-1: 1-0:1 info: Full speed (or root) Hub ports: 16 rev: 2.0 speed: 480 Mb/s 
           chip-ID: 1d6b:0002 class-ID: 0900 
           Device-1: 1-5:2 info: Quanta HP Wide Vision HD Camera type: Video driver: uvcvideo 
           interfaces: 2 rev: 2.0 speed: 480 Mb/s power: 500mA chip-ID: 0408:5300 class-ID: 0e02 
           serial: <filter> 
           Device-2: 1-14:3 info: Realtek Realtek Bluetooth 4.2 Adapter type: Bluetooth 
           driver: btusb interfaces: 2 rev: 1.1 speed: 12 Mb/s power: 500mA chip-ID: 0bda:b00b 
           class-ID: e001 serial: <filter> 
           Hub-2: 2-0:1 info: Full speed (or root) Hub ports: 8 rev: 3.1 speed: 10 Gb/s 
           chip-ID: 1d6b:0003 class-ID: 0900 
Sensors:   System Temperatures: cpu: 48.0 C mobo: 29.8 C 
           Fan Speeds (RPM): N/A 
Info:      Processes: 252 Uptime: 5m wakeups: 1 Init: systemd v: 248 Compilers: gcc: 11.1.0 
           Packages: note: see --pkg pacman: 1262 Shell: Bash v: 5.1.8 running-in: konsole 
           inxi: 3.3.06 

Someone didn’t read the tutorial. Help us help you.

2 Likes

Thanks for updating your post. Searching the internet for 15-dk0xxx linux brightness keys yields open bug reports for the same issue.

https://www.mail-archive.com/kernel-packages@lists.launchpad.net/msg452180.html

1 Like