I am not able to decrease the brightness of my screen in Manjaro Plasma Ornara

Hello everyone, my laptop is not increasing or decreasing the brightness of the screen, before and after upgrading to the Manjaro Ornara [Plasma KDE] version. This is since I installed Manjaro Plasma (without internet on that day, but then I updated the system with the command “sudo pacman -Syyuu” in later days, but it still didn’t solve it.)

Here is a screenshot showing me decreasing de brightness, but not changing nothing on laptop screen

Belows follow my inxi output

  Kernel: 5.9.16-1-MANJARO x86_64 bits: 64 compiler: gcc v: 10.2.0 
  parameters: BOOT_IMAGE=/boot/vmlinuz-5.9-x86_64 
  root=UUID=a41f300c-9125-4bb7-822e-550ea37ae62b ro quiet apparmor=1 
  security=apparmor udev.log_priority=3 
  Desktop: KDE Plasma 5.21.3 tk: Qt 5.15.2 wm: kwin_x11 vt: 1 dm: SDDM 
  Distro: Manjaro Linux base: Arch Linux 
  Type: Laptop System: Hewlett-Packard product: N/A v: A3009DD10303 
  serial: <filter> Chassis: type: 10 serial: <filter> 
  Mobo: Hewlett-Packard model: 1946 v: KBC Version 89.17 serial: <filter> 
  UEFI: Hewlett-Packard v: L73 Ver. 01.49 date: 08/29/2019 
  ID-1: BAT0 charge: 26.9 Wh (99.3%) condition: 27.1/27.1 Wh (100.0%) 
  volts: 17.0 min: 14.8 model: Hewlett-Packard Primary type: Li-ion 
  serial: <filter> status: Unknown 
  RAM: total: 3.73 GiB used: 2.58 GiB (69.2%) 
  RAM Report: permissions: Unable to run dmidecode. Root privileges required. 
  Info: Dual Core model: Intel Core i5-4200U bits: 64 type: MT MCP 
  arch: Haswell family: 6 model-id: 45 (69) stepping: 1 microcode: 26 cache: 
  L2: 3 MiB bogomips: 18367 
  Speed: 1597 MHz min/max: 800/2600 MHz Core speeds (MHz): 1: 1597 2: 1676 
  3: 1657 4: 1597 
  Flags: abm acpi aes aperfmperf apic arat arch_perfmon avx avx2 bmi1 bmi2 bts 
  clflush 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 ibpb ibrs ida invpcid invpcid_single lahf_lm lm mca mce md_clear mmx 
  monitor movbe msr mtrr nonstop_tsc nopl nx pae pat pbe pcid pclmulqdq pdcm 
  pdpe1gb pebs pge pln pni popcnt pse pse36 pti pts rdrand rdtscp rep_good 
  sdbg sep 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 xsave 
  xsaveopt xtopology xtpr 
  Vulnerabilities: Type: itlb_multihit status: KVM: VMX disabled 
  Type: l1tf 
  mitigation: PTE Inversion; VMX: conditional cache flushes, SMT vulnerable 
  Type: mds mitigation: Clear CPU buffers; SMT vulnerable 
  Type: meltdown mitigation: PTI 
  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 
  Device-1: Intel Haswell-ULT Integrated Graphics vendor: Hewlett-Packard 
  driver: i915 v: kernel bus-ID: 00:02.0 chip-ID: 8086:0a16 class-ID: 0300 
  Device-2: Chicony HP HD Webcam type: USB driver: uvcvideo bus-ID: 2-7:5 
  chip-ID: 04f2:b3c8 class-ID: 0e02 serial: <filter> 
  Display: x11 server: X.Org 1.20.10 compositor: kwin_x11 driver: 
  loaded: intel unloaded: modesetting alternate: fbdev,vesa display-ID: :0 
  screens: 1 
  Screen-1: 0 s-res: 1366x768 s-dpi: 96 s-size: 361x203mm (14.2x8.0") 
  s-diag: 414mm (16.3") 
  Monitor-1: eDP1 res: 1366x768 hz: 60 dpi: 120 size: 290x170mm (11.4x6.7") 
  diag: 336mm (13.2") 
  OpenGL: renderer: Mesa DRI Intel HD Graphics 4400 (HSW GT2) 
  v: 4.5 Mesa 20.3.4 compat-v: 3.0 direct render: Yes 
  Device-1: Intel Haswell-ULT HD Audio vendor: Hewlett-Packard 
  driver: snd_hda_intel v: kernel bus-ID: 00:03.0 chip-ID: 8086:0a0c 
  class-ID: 0403 
  Device-2: Intel 8 Series HD Audio vendor: Hewlett-Packard 
  driver: snd_hda_intel v: kernel bus-ID: 00:1b.0 chip-ID: 8086:9c20 
  class-ID: 0403 
  Sound Server-1: ALSA v: k5.9.16-1-MANJARO running: yes 
  Sound Server-2: JACK v: 0.125.0 running: no 
  Sound Server-3: PulseAudio v: 14.2 running: yes 
  Sound Server-4: PipeWire v: 0.3.23 running: yes 
  Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet 
  vendor: Hewlett-Packard driver: r8169 v: kernel port: 3000 bus-ID: 03:00.0 
  chip-ID: 10ec:8168 class-ID: 0200 
  IF: enp3s0 state: down mac: <filter> 
  Device-2: Qualcomm Atheros QCA9565 / AR9565 Wireless Network Adapter 
  vendor: Hewlett-Packard driver: ath9k v: kernel port: 3000 bus-ID: 04:00.0 
  chip-ID: 168c:0036 class-ID: 0280 
  IF: wlo1 state: down mac: <filter> 
  Device-3: Huawei Broadband stick type: USB 
  driver: cdc_ether,option,option1,usb-storage bus-ID: 2-2.1:8 
  chip-ID: 12d1:1436 class-ID: 0806 
  IF: wwp0s20u2u1i1 state: down mac: <filter> 
  IF-ID-1: ppp0 state: unknown speed: N/A duplex: N/A mac: N/A 
  IP v4: <filter> type: noprefixroute scope: global 
  WAN IP: <filter> 
  Device-1: Qualcomm Atheros AR3012 Bluetooth type: USB driver: btusb v: 0.8 
  bus-ID: 2-4:7 chip-ID: 0cf3:311f class-ID: e001 
  Report: This feature requires one of these tools: hciconfig/bt-adapter 
  Message: No LVM data was found. 
  Message: No RAID data was found. 
  Local Storage: total: 465.76 GiB used: 46.57 GiB (10.0%) 
  SMART Message: Unable to run smartctl. Root privileges required. 
  ID-1: /dev/sda maj-min: 8:0 vendor: Toshiba model: MQ01ABF050 
  size: 465.76 GiB block-size: physical: 4096 B logical: 512 B speed: 3.0 Gb/s 
  rotation: 5400 rpm serial: <filter> rev: 2C scheme: GPT 
  Optical-1: /dev/sr0 vendor: HUAWEI model: Mass Storage rev: 2.31 
  dev-links: cdrom 
  Features: speed: 1 multisession: yes audio: yes dvd: no rw: none 
  state: running 
  ID-1: / raw-size: 30 GiB size: 29.4 GiB (98.00%) used: 13.04 GiB (44.4%) 
  fs: ext4 dev: /dev/sda8 maj-min: 8:8 label: Manjaro-Root 
  uuid: a41f300c-9125-4bb7-822e-550ea37ae62b 
  ID-2: /boot/efi raw-size: 301 MiB size: 300.4 MiB (99.80%) 
  used: 312 KiB (0.1%) fs: vfat dev: /dev/sda1 maj-min: 8:1 label: N/A 
  uuid: 92CC-F6C9 
  ID-3: /home raw-size: 285 GiB size: 279.53 GiB (98.08%) 
  used: 33.52 GiB (12.0%) fs: ext4 dev: /dev/sda2 maj-min: 8:2 label: Home 
  uuid: afa791ab-389b-44e1-9f83-5e98b16073e9 
  Kernel: swappiness: 60 (default) cache-pressure: 100 (default) 
  ID-1: swap-1 type: partition size: 7 GiB used: 0 KiB (0.0%) priority: -2 
  dev: /dev/sda3 maj-min: 8:3 label: N/A 
  uuid: a433397e-215d-4fc6-a8a6-b3370737d37d 
  ID-1: /dev/sda4 maj-min: 8:4 size: 113.46 GiB fs: ext4 label: PrimeOS 
  uuid: e5d445e4-f59f-5158-b9c7-465f7009bc23 
  ID-2: /dev/sda5 maj-min: 8:5 size: 30 GiB fs: ext4 label: N/A 
  uuid: 495d43f2-5d08-468b-9c42-04ddeb658fdd 
  ID-3: /dev/sda7 maj-min: 8:7 size: 2.5 MiB fs: <superuser required> 
  label: N/A uuid: N/A 
  Hub-1: 1-0:1 info: Full speed (or root) Hub ports: 2 rev: 2.0 
  speed: 480 Mb/s chip-ID: 1d6b:0002 class-ID: 0900 
  Hub-2: 1-1:2 info: Intel Integrated Rate Matching Hub ports: 8 rev: 2.0 
  speed: 480 Mb/s chip-ID: 8087:8000 class-ID: 0900 
  Hub-3: 2-0:1 info: Full speed (or root) Hub ports: 9 rev: 2.0 
  speed: 480 Mb/s chip-ID: 1d6b:0002 class-ID: 0900 
  Hub-4: 2-2:2 info: VIA Labs VL813 Hub ports: 4 rev: 2.1 speed: 480 Mb/s 
  chip-ID: 2109:2813 class-ID: 0900 
  Device-1: 2-2.1:8 info: Huawei Broadband stick 
  type: Ethernet Network,CDC-Data,Mass Storage 
  driver: cdc_ether,option,option1,usb-storage interfaces: 7 rev: 2.0 
  speed: 480 Mb/s power: 500mA chip-ID: 12d1:1436 class-ID: 0806 
  Device-2: 2-4:7 info: Qualcomm Atheros AR3012 Bluetooth type: Bluetooth 
  driver: btusb interfaces: 2 rev: 1.1 speed: 12 Mb/s power: 100mA 
  chip-ID: 0cf3:311f class-ID: e001 
  Device-3: 2-6:4 info: Primax USB Optical Mouse type: Mouse 
  driver: hid-generic,usbhid interfaces: 1 rev: 2.0 speed: 1.5 Mb/s 
  power: 100mA chip-ID: 0461:4d22 class-ID: 0301 
  Device-4: 2-7:5 info: Chicony HP HD Webcam type: Video driver: uvcvideo 
  interfaces: 2 rev: 2.0 speed: 480 Mb/s power: 500mA chip-ID: 04f2:b3c8 
  class-ID: 0e02 serial: <filter> 
  Hub-5: 3-0:1 info: Full speed (or root) Hub ports: 4 rev: 3.0 speed: 5 Gb/s 
  chip-ID: 1d6b:0003 class-ID: 0900 
  Hub-6: 3-2:2 info: VIA Labs VL813 Hub ports: 4 rev: 3.0 speed: 5 Gb/s 
  chip-ID: 2109:0813 class-ID: 0900 
  System Temperatures: cpu: 55.0 C mobo: 0.0 C 
  Fan Speeds (RPM): N/A 
  Processes: 205 Uptime: 23m wakeups: 1 Init: systemd v: 247 tool: systemctl 
  Compilers: gcc: N/A Packages: pacman: 1336 lib: 416 flatpak: 0 Shell: Zsh 
  v: 5.8 default: Bash v: 5.1.0 running-in: konsole inxi: 3.3.03 

What should I do to be able to increase the brightness on my laptop screen?

try running xbacklight -dec 10 or xbacklight -inc 10 and see if any errors occur

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With xbacklight -dec 10 came this…

The application xbacklight is not installed. It may be found in the following packages:
  extra/xorg-xbacklight 1.2.3-2 /usr/bin/xbacklight
  community/acpilight 1.2-2     /usr/bin/xbacklight
Do you want to Install package xorg-xbacklight? (y/N)

I think it was missing to install the xbacklight package. But, it seems that before doing the installation, I will have to update the system (almost 860 MB), and I have little mobile phone data. When I have internet I will update and see if it is resolved.
Thank you very much.

perfect, hope it works!

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