When the display brightness is set to 100%, the actual brightness drops below 5%

Yes sure

❯ inxi -zv8 
System: 
  Kernel: 6.18.44-1-MANJARO arch: x86_64 bits: 64 compiler: gcc v: 16.1.1 
    clocksource: tsc avail: hpet,acpi_pm 
    parameters: BOOT_IMAGE=/vmlinuz-6.18-x86_64 
    root=UUID=45fa753c-3a23-4546-a575-86da868b130c rw quiet splash 
    udev.log_priority=3 
  Desktop: KDE Plasma v: 6.7.4 tk: Qt v: N/A info: frameworks v: 6.28.0 
    wm: kwin_wayland vt: 2 dm: N/A Distro: Manjaro base: Arch Linux 
Machine: 
  Type: Laptop System: ASUSTeK product: VivoBook_ASUSLaptop M1603QA_M1603QA 
    v: 1.0 serial: <superuser required> 
  Mobo: ASUSTeK model: M1603QA v: 1.0 serial: <superuser required> 
    uuid: <superuser required> Firmware: UEFI vendor: American Megatrends LLC. 
    v: M1603QA.308 date: 05/22/2023 
Battery: 
  ID-1: BAT0 charge: 26.2 Wh (60.5%) condition: 43.3/50 Wh (86.5%) 
    volts: 11.88 min: 11.88 model: ASUSTeK ASUS Battery type: Li-ion serial: N/A 
    charging: status: not charging control: start: N/A end: 60% cycles: 38 
Memory: 
  System RAM: total: 16 GiB available: 15.02 GiB used: 5.52 GiB (36.7%) 
  Message: For most reliable report, use superuser + dmidecode. 
  Array-1: capacity: 32 GiB slots: 2 modules: 2 EC: None 
    max-module-size: 16 GiB note: est. 
  Device-1: Channel-A DIMM 0 type: DDR4 detail: synchronous unbuffered 
    (unregistered) size: 8 GiB speed: 3200 MT/s volts: note: check curr: 1 
    min: 1 max: 1 width (bits): data: 64 total: 64 
    manufacturer: Micron Technology part-no: 4ATF1G64HZ-3G2F1 serial: N/A 
  Device-2: Channel-B DIMM 0 type: DDR4 detail: synchronous unbuffered 
    (unregistered) size: 8 GiB speed: 3200 MT/s volts: note: check curr: 1 
    min: 1 max: 1 width (bits): data: 64 total: 64 
    manufacturer: Micron Technology part-no: 8ATF1G64HZ-3G2R1 serial: <filter> 
PCI Slots: 
  Permissions: Unable to run dmidecode. Root privileges required. 
CPU: 
  Info: model: AMD Ryzen 5 5600H with Radeon Graphics bits: 64 type: MT MCP 
    arch: Zen 3 gen: 3 level: v3 note: check built: 2021-22 
    process: TSMC n7 (7nm) family: 0x19 (25) model-id: 0x50 (80) stepping: 0 
    microcode: 0xA500012 
  Topology: cpus: 1x dies: 1 clusters: 1 cores: 6 threads: 12 tpc: 2 
    smt: enabled cache: L1: 384 KiB desc: d-6x32 KiB; i-6x32 KiB L2: 3 MiB 
    desc: 6x512 KiB L3: 16 MiB desc: 1x16 MiB 
  Speed (MHz): avg: 1109 min/max: 413/4281 boost: enabled scaling: 
    driver: amd-pstate-epp governor: powersave cores: 1: 1109 2: 1109 3: 1109 
    4: 1109 5: 1109 6: 1109 7: 1109 8: 1109 9: 1109 10: 1109 11: 1109 12: 1109 
    bogomips: 79054 
  Flags: 3dnowprefetch abm adx aes aperfmperf apic arat avic avx avx2 bmi1 
    bmi2 bpext cat_l3 cdp_l3 clflush clflushopt clwb clzero cmov cmp_legacy 
    constant_tsc cpb cppc cpuid cqm cqm_llc cqm_mbm_local cqm_mbm_total 
    cqm_occup_llc cr8_legacy cx16 cx8 de debug_swap decodeassists erms 
    extapic extd_apicid f16c flushbyasid fma fpu fsgsbase fsrm fxsr fxsr_opt 
    ht hw_pstate ibpb ibrs ibs invpcid irperf lahf_lm lbrv lm mba mca mce 
    misalignsse mmx mmxext monitor movbe msr mtrr mwaitx nonstop_tsc nopl npt 
    nrip_save nx ospke osvw overflow_recov pae pat pausefilter pclmulqdq 
    pdpe1gb perfctr_core perfctr_llc perfctr_nb pfthreshold pge pku pni 
    popcnt pse pse36 rapl rdpid rdpru rdrand rdseed rdt_a rdtscp rep_good sep 
    sha_ni skinit smap smca smep ssbd sse sse2 sse4_1 sse4_2 sse4a ssse3 
    stibp succor svm svm_lock syscall tce topoext tsc tsc_scale umip 
    user_shstk v_spec_ctrl v_vmsave_vmload vaes vgif vmcb_clean vme vmmcall 
    vpclmulqdq wbnoinvd wdt xgetbv1 xsave xsavec xsaveerptr xsaveopt xsaves 
    xtopology 
  Vulnerabilities: 
  Type: gather_data_sampling status: Not affected 
  Type: ghostwrite status: Not affected 
  Type: indirect_target_selection status: Not affected 
  Type: itlb_multihit status: Not affected 
  Type: l1tf status: Not affected 
  Type: mds status: Not affected 
  Type: meltdown status: Not affected 
  Type: mmio_stale_data status: Not affected 
  Type: old_microcode status: Not affected 
  Type: reg_file_data_sampling status: Not affected 
  Type: retbleed status: Not affected 
  Type: spec_rstack_overflow mitigation: Safe RET 
  Type: spec_store_bypass mitigation: Speculative Store Bypass disabled via 
    prctl 
  Type: spectre_v1 mitigation: usercopy/swapgs barriers and \__user pointer 
    sanitization 
  Type: spectre_v2 mitigation: Retpolines; IBPB: conditional; IBRS_FW; 
    STIBP: always-on; RSB filling; PBRSB-eIBRS: Not affected; BHI: Not 
    affected 
  Type: srbds status: Not affected 
  Type: tsa mitigation: Clear CPU buffers 
  Type: tsx_async_abort status: Not affected 
  Type: vmscape mitigation: IBPB before exit to userspace 
Graphics: 
  Device-1: Advanced Micro Devices \[AMD/ATI\] Cezanne \[Radeon Vega Series / 
    Radeon Mobile Series\] vendor: ASUSTeK driver: amdgpu v: kernel arch: GCN-5 
    code: Vega process: GF 14nm built: 2017-20 pcie: gen: 3 speed: 8 GT/s 
    lanes: 16 ports: active: eDP-1 empty: HDMI-A-1 bus-ID: 03:00.0 
    chip-ID: 1002:1638 class-ID: 0300 temp: 42.0 C 
  Device-2: IMC Networks USB2.0 HD UVC WebCam driver: uvcvideo type: USB 
    rev: 2.0 speed: 480 Mb/s lanes: 1 mode: 2.0 bus-ID: 3-3:3 chip-ID: 13d3:5463 
    class-ID: fe01 serial: <filter> 
  Display: wayland server: X.org v: 1.21.1.24 with: Xwayland v: 24.1.13 
    compositor: kwin_wayland driver: X: loaded: amdgpu unloaded: modesetting 
    alternate: fbdev,vesa dri: radeonsi gpu: amdgpu display-ID: 0 
  Monitor-1: eDP-1 model: ChiMei InnoLux 0x1618 built: 2022 res: 
    mode: 1920x1200 hz: 60 scale: 120% (1.2) to: 1600x1000 dpi: 142 gamma: 1.2 
    chroma: red: x: 0.592 y: 0.349 green: x: 0.329 y: 0.557 blue: x: 0.153 
    y: 0.118 white: x: 0.314 y: 0.329 size: 344x215mm (13.54x8.46") 
    diag: 406mm (16") ratio: 16:10 modes: 1920x1200, 1920x1080, 1600x1200, 
    1680x1050, 1280x1024, 1440x900, 1280x800, 1280x720, 1024x768, 800x600, 
    640x480 
  API: EGL v: 1.5 hw: drv: amd radeonsi platforms: device: 0 drv: radeonsi 
    device: 1 drv: swrast gbm: drv: radeonsi surfaceless: drv: radeonsi wayland: 
    drv: radeonsi x11: drv: radeonsi 
  API: OpenGL v: 4.6 vendor: amd mesa v: 26.1.6-arch1.1 glx-v: 1.4 
    direct-render: yes renderer: AMD Radeon Graphics (radeonsi renoir ACO DRM 
    3.64 6.18.44-1-MANJARO) device-ID: 1002:1638 memory: 500 MiB unified: yes 
    display-ID: :0.0 
  API: Vulkan v: 1.4.357 layers: 2 device: 0 type: integrated-gpu name: AMD 
    Radeon Graphics (RADV RENOIR) driver: mesa radv v: 26.1.6-arch1.1 
    device-ID: 1002:1638 surfaces: N/A 
  Info: Tools: api: clinfo, eglinfo, glxinfo, vulkaninfo 
    de: kscreen-console,kscreen-doctor wl: wayland-info x11: xdpyinfo,xprop 
Audio: 
  Device-1: Advanced Micro Devices \[AMD/ATI\] Renoir/Cezanne HDMI/DP Audio 
    driver: snd_hda_intel v: kernel pcie: gen: 3 speed: 8 GT/s lanes: 16 
    bus-ID: 03:00.1 chip-ID: 1002:1637 class-ID: 0403 
  Device-2: Advanced Micro Devices \[AMD\] Audio Coprocessor vendor: ASUSTeK 
    driver: N/A alternate: snd_pci_acp3x, snd_rn_pci_acp3x, snd_pci_acp5x, 
    snd_pci_acp6x, snd_acp_pci, snd_rpl_pci_acp6x, snd_pci_ps, 
    snd_sof_amd_renoir, snd_sof_amd_rembrandt, snd_sof_amd_vangogh, 
    snd_sof_amd_acp63, snd_sof_amd_acp70 pcie: gen: 3 speed: 8 GT/s lanes: 16 
    bus-ID: 03:00.5 chip-ID: 1022:15e2 class-ID: 0480 
  Device-3: Advanced Micro Devices \[AMD\] Ryzen HD Audio vendor: ASUSTeK 
    driver: snd_hda_intel v: kernel pcie: gen: 3 speed: 8 GT/s lanes: 16 
    bus-ID: 03:00.6 chip-ID: 1022:15e3 class-ID: 0403 
  API: ALSA v: k6.18.44-1-MANJARO status: kernel-api with: aoss 
    type: oss-emulator tools: alsactl,alsamixer,amixer 
  Server-1: sndiod v: N/A status: off tools: aucat,midicat,sndioctl 
  Server-2: JACK v: 1.9.22 status: off tools: N/A 
  Server-3: PipeWire v: 1.6.8 status: active with: 1: pipewire-pulse 
    status: active 2: wireplumber status: active 3: pipewire-alsa type: plugin 
    tools: pactl,pw-cat,pw-cli,wpctl 
Network: 
  Device-1: MEDIATEK MT7921 802.11ax PCIe Wireless Network Adapter \[Filogic 
    330\] vendor: AzureWave driver: mt7921e v: kernel pcie: gen: 2 
    speed: 5 GT/s lanes: 1 bus-ID: 01:00.0 chip-ID: 14c3:7961 class-ID: 0280 
  IF: wlp1s0 state: up mac: <filter> 
  IP v4: <filter> type: dynamic noprefixroute scope: global 
    broadcast: <filter> 
  IP v6: <filter> type: noprefixroute scope: global 
  IP v6: <filter> type: dynamic noprefixroute scope: global 
  IP v6: <filter> type: noprefixroute scope: link 
  Info: services: NetworkManager, systemd-timesyncd, wpa_supplicant 
  WAN IP: <filter> 
Bluetooth: 
  Device-1: IMC Networks Wireless_Device driver: btusb v: 0.8 type: USB 
    rev: 2.1 speed: 480 Mb/s lanes: 1 mode: 2.0 bus-ID: 3-2:2 chip-ID: 13d3:3563 
    class-ID: e001 serial: <filter> 
  Report: rfkill ID: hci0 rfk-id: 0 state: up address: see --recommends 
Logical: 
  Message: No logical block device data found. 
RAID: 
  Message: No RAID data found. 
Drives: 
  Local Storage: total: 1.82 TiB used: 580.93 GiB (31.2%) 
  SMART Message: Unable to run smartctl. Root privileges required. 
  ID-1: /dev/nvme0n1 maj-min: 259:0 vendor: Western Digital 
    model: WD BLACK SN7100 2TB size: 1.82 TiB block-size: physical: 512 B 
    logical: 512 B speed: 63.2 Gb/s lanes: 4 tech: SSD serial: <filter> 
    fw-rev: 7615M0WD temp: 26.9 C scheme: GPT 
  Message: No optical or floppy data found. 
Partition: 
  ID-1: / raw-size: 100 GiB size: 97.87 GiB (97.87%) used: 38.61 GiB (39.4%) 
    fs: ext4 dev: /dev/nvme0n1p7 maj-min: 259:7 label: N/A 
    uuid: 45fa753c-3a23-4546-a575-86da868b130c 
  ID-2: /boot raw-size: 2 GiB size: 1.9 GiB (95.01%) used: 93.3 MiB (4.8%) 
    fs: ext4 dev: /dev/nvme0n1p6 maj-min: 259:6 label: N/A 
    uuid: acaceb85-43ff-4273-98ef-284f0956de6d 
  ID-3: /boot/efi raw-size: 2 GiB size: 2 GiB (99.80%) used: 332 KiB (0.0%) 
    fs: vfat dev: /dev/nvme0n1p5 maj-min: 259:5 label: N/A uuid: C271-48DA 
  ID-4: /home raw-size: 1.49 TiB size: 1.47 TiB (98.36%) 
    used: 542.23 GiB (36.1%) fs: ext4 dev: /dev/nvme0n1p8 maj-min: 259:8 
    label: N/A uuid: 5863ca40-0dc6-4edc-b36e-4ebb676d6cac 
Swap: 
  Kernel: swappiness: 10 (default 60) cache-pressure: 100 (default) zswap: yes 
    compressor: zstd max-pool: 20% 
  ID-1: swap-1 type: partition size: 30 GiB used: 0 KiB (0.0%) priority: -2 
    dev: /dev/nvme0n1p9 maj-min: 259:9 label: N/A 
    uuid: 90e18a7f-457b-4f77-b2c6-6506fb86aaf5 
Unmounted: 
  ID-1: /dev/nvme0n1p1 maj-min: 259:1 size: 200 MiB fs: vfat label: N/A 
    uuid: D4D3-E0D7 
  ID-2: /dev/nvme0n1p2 maj-min: 259:2 size: 16 MiB fs: <superuser required> 
    label: N/A uuid: N/A 
  ID-3: /dev/nvme0n1p3 maj-min: 259:3 size: 199.93 GiB fs: ntfs label: N/A 
    uuid: 0E1CD56E1CD55177 
  ID-4: /dev/nvme0n1p4 maj-min: 259:4 size: 772 MiB fs: ntfs label: N/A 
    uuid: A2DC4636DC46054F 
USB: 
  Hub-1: 1-0:1 info: hi-speed hub with single TT ports: 4 rev: 2.0 
    speed: 480 Mb/s (57.2 MiB/s) lanes: 1 mode: 2.0 chip-ID: 1d6b:0002 
    class-ID: 0900 
  Hub-2: 2-0:1 info: super-speed hub ports: 2 rev: 3.1 
    speed: 10 Gb/s (1.16 GiB/s) lanes: 1 mode: 3.2 gen-2x1 chip-ID: 1d6b:0003 
    class-ID: 0900 
  Hub-3: 3-0:1 info: hi-speed hub with single TT ports: 4 rev: 2.0 
    speed: 480 Mb/s (57.2 MiB/s) lanes: 1 mode: 2.0 chip-ID: 1d6b:0002 
    class-ID: 0900 
  Device-1: 3-2:2 info: IMC Networks Wireless_Device type: bluetooth 
    driver: btusb interfaces: 3 rev: 2.1 speed: 480 Mb/s (57.2 MiB/s) lanes: 1 
    mode: 2.0 power: 100mA chip-ID: 13d3:3563 class-ID: e001 serial: <filter> 
  Device-2: 3-3:3 info: IMC Networks USB2.0 HD UVC WebCam type: video 
    driver: uvcvideo interfaces: 3 rev: 2.0 speed: 480 Mb/s (57.2 MiB/s) 
    lanes: 1 mode: 2.0 power: 500mA chip-ID: 13d3:5463 class-ID: fe01 
    serial: <filter> 
  Hub-4: 4-0:1 info: super-speed hub ports: 2 rev: 3.1 
    speed: 10 Gb/s (1.16 GiB/s) lanes: 1 mode: 3.2 gen-2x1 chip-ID: 1d6b:0003 
    class-ID: 0900 
Sensors: 
  System Temperatures: cpu: 53.2 C mobo: 34.0 C gpu: amdgpu temp: 44.0 C 
  Fan Speeds (rpm): cpu: 0 
Repos: 
  Packages: 1562 pm: pacman pkgs: 1517 libs: 401 tools: pamac pm: flatpak 
    pkgs: 45 
  Active pacman repo servers in: /etc/pacman.d/mirrorlist 
    1: https://ftp.snt.utwente.nl/pub/linux/manjaro/stable/$repo/$arch 
    2: https://ftp.free.org/mirrors/repo.manjaro.org/repos/stable/$repo/$arch 
    3: https://mirror.futureweb.be/manjaro/stable/$repo/$arch 
    4: https://mirrors.up.pt/pub/manjaro/stable/$repo/$arch 
    5: https://mirror.it4i.cz/manjaro/stable/$repo/$arch 
    6: https://mirror1.sox.rs/manjaro/stable/$repo/$arch 
    7: https://fosszone.csd.auth.gr/manjaro/stable/$repo/$arch 
    8: https://mirrors.ucr.ac.cr/manjaro/stable/$repo/$arch 
Processes: 
  CPU top: 5 of 316 
  1: cpu: 9.2% command: firefox pid: 34444 mem: 754.5 MiB (4.9%) 
  2: cpu: 7.0% command: firefox pid: 35095 mem: 337.9 MiB (2.1%) 
  3: cpu: 6.9% command: konsole pid: 35469 mem: 123.9 MiB (0.8%) 
  4: cpu: 5.2% command: zsh pid: 35481 mem: 10.6 MiB (0.0%) 
  5: cpu: 3.2% command: kwin_wayland pid: 1015 mem: 233.9 MiB (1.5%) 
  Memory top: 5 of 316 
  1: mem: 803.1 MiB (5.2%) command: plasmashell pid: 1131 cpu: 2.9% 
  2: mem: 754.5 MiB (4.9%) command: firefox pid: 34444 cpu: 9.2% 
  3: mem: 577.2 MiB (3.7%) command: QtWebEngineProcess pid: 1662 cpu: 0.0% 
  4: mem: 384.1 MiB (2.4%) command: firefox pid: 34832 cpu: 1.9% 
  5: mem: 346.4 MiB (2.2%) command: firefox pid: 34763 cpu: 1.5% 
Info: 
  Processes: 316 Power: uptime: 6h 52m states: freeze,mem,disk suspend: s2idle 
    wakeups: 1 hibernate: platform avail: shutdown, reboot, suspend, test_resume 
    image: 5.95 GiB services: org_kde_powerdevil, power-profiles-daemon, 
    upowerd Init: systemd v: 261 default: graphical tool: systemctl 
  Compilers: clang: 22.1.8 gcc: 16.1.1 Shell: Zsh v: 5.9.2 
    running-in: konsole inxi: 3.3.41