Problem with external monitor brightness

Issues & Assistance
1

hi, before i start i want to say that i did search this up an found nothing about the exact same problem i have

the problem is when my laptop goes to sleep, when i come back to it after a few hours and open it back the brightness of my external screen gets reduced to 30%. the problem is that this isnt done to garuda’s brightness settings but to the screen’s internal settings . Garuda shows that both the laptop and external screen are at 100% but the external one got the internal settings reduced to 30%

does anyone know how to fix this ?

and this is my system:

System:
Kernel: 6.15.3-zen1-1-zen arch: x86_64 bits: 64 compiler: gcc v: 15.1.1
clocksource: hpet avail: acpi_pm
parameters: BOOT_IMAGE=/@/boot/vmlinuz-linux-zen
root=UUID=38b8c0fd-ad69-49a0-886d-580605beb2ef rw rootflags=subvol=@
quiet loglevel=3 ibt=off
Desktop: KDE Plasma v: 6.4.1 tk: Qt v: N/A info: frameworks v: 6.15.0
wm: kwin_wayland vt: 1 dm: SDDM Distro: Garuda base: Arch Linux
Machine:
Type: Laptop System: ASUSTeK product: VivoBook_ASUSLaptop X512DA_X512DA
v: 1.0 serial: <superuser required>
Mobo: ASUSTeK model: X512DA v: 1.0 serial: <superuser required>
uuid: <superuser required> UEFI: American Megatrends v: X512DA.318
date: 09/28/2022
Battery:
ID-1: BAT0 charge: 23.5 Wh (98.3%) condition: 23.9/37.1 Wh (64.4%)
volts: 7.8 min: 7.8 model: ASUSTeK ASUS Battery type: Li-ion serial: N/A
status: not charging cycles: 215
CPU:
Info: model: AMD Ryzen 5 3500U with Radeon Vega Mobile Gfx bits: 64
type: MT MCP arch: Zen/Zen+ note: check gen: 1 level: v3 note: check
built: 2019 process: GF 12nm family: 0x17 (23) model-id: 0x18 (24)
stepping: 1 microcode: 0x8108109
Topology: cpus: 1x dies: 1 clusters: 1 cores: 4 threads: 8 tpc: 2
smt: enabled cache: L1: 384 KiB desc: d-4x32 KiB; i-4x64 KiB L2: 2 MiB
desc: 4x512 KiB L3: 4 MiB desc: 1x4 MiB
Speed (MHz): avg: 2769 min/max: 1400/2100 boost: enabled scaling:
driver: acpi-cpufreq governor: schedutil cores: 1: 2769 2: 2769 3: 2769
4: 2769 5: 2769 6: 2769 7: 2769 8: 2769 bogomips: 33535
Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm
Vulnerabilities: <filter>
Graphics:
Device-1: Advanced Micro Devices [AMD/ATI] Picasso/Raven 2 [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: HDMI-A-1,eDP-1 empty: none
bus-ID: 03:00.0 chip-ID: 1002:15d8 class-ID: 0300 temp: 65.0 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: 3-2.2:5
chip-ID: 13d3:56dd class-ID: 0e02 serial: <filter>
Display: wayland server: X.org v: 1.21.1.18 with: Xwayland v: 24.1.8
compositor: kwin_wayland driver: X: loaded: amdgpu unloaded: modesetting
alternate: fbdev,vesa dri: radeonsi gpu: amdgpu d-rect: 3840x1080
display-ID: 0
Monitor-1: HDMI-A-1 pos: right model: Idek Iiyama PL2730H serial: <filter>
built: 2018 res: mode: 1920x1080 hz: 75 scale: 100% (1) dpi: 82 gamma: 1.2
size: 598x336mm (23.54x13.23") diag: 686mm (27") ratio: 16:9 modes:
max: 1920x1080 min: 720x400
Monitor-2: eDP-1 pos: primary,left model: BOE Display 0x07f1 built: 2018
res: mode: 1920x1080 hz: 60 scale: 100% (1) dpi: 142 gamma: 1.2
size: 344x193mm (13.54x7.6") diag: 394mm (15.5") ratio: 16:9 modes:
max: 1920x1080 min: 640x480
API: EGL v: 1.5 hw: drv: amd radeonsi platforms: device: 0 drv: radeonsi
device: 1 drv: swrast gbm: drv: kms_swrast surfaceless: drv: radeonsi
wayland: drv: radeonsi x11: drv: radeonsi
API: OpenGL v: 4.6 compat-v: 4.5 vendor: amd mesa v: 25.1.4-arch1.1
glx-v: 1.4 direct-render: yes renderer: AMD Radeon Vega 8 Graphics
(radeonsi raven ACO DRM 3.63 6.15.3-zen1-1-zen) device-ID: 1002:15d8
memory: 1.95 GiB unified: no display-ID: :1.0
API: Vulkan v: 1.4.313 layers: 9 device: 0 type: integrated-gpu name: AMD
Radeon Vega 8 Graphics (RADV RAVEN) driver: mesa radv v: 25.1.4-arch1.1
device-ID: 1002:15d8 surfaces: N/A device: 1 type: cpu name: llvmpipe
(LLVM 20.1.6 256 bits) driver: mesa llvmpipe v: 25.1.4-arch1.1 (LLVM
20.1.6) device-ID: 10005:0000 surfaces: N/A
Info: Tools: api: clinfo, eglinfo, glxinfo, vulkaninfo
de: kscreen-console,kscreen-doctor wl: wayland-info
x11: xdpyinfo, xprop, xrandr
Audio:
Device-1: Advanced Micro Devices [AMD/ATI] Raven/Raven2/Fenghuang 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: 1002:15de class-ID: 0403
Device-2: Advanced Micro Devices [AMD] Audio Coprocessor
driver: snd_pci_acp3x v: kernel alternate: 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] Family 17h/19h/1ah 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: k6.15.3-zen1-1-zen status: kernel-api tools: N/A
Server-1: PipeWire v: 1.4.5 status: active with: 1: pipewire-pulse
status: active 2: wireplumber status: active 3: pipewire-alsa type: plugin
4: pw-jack type: plugin tools: pactl,pw-cat,pw-cli,wpctl
Network:
Device-1: Qualcomm Atheros QCA9377 802.11ac Wireless Network Adapter
vendor: AzureWave driver: ath10k_pci v: kernel pcie: gen: 1 speed: 2.5 GT/s
lanes: 1 bus-ID: 01:00.0 chip-ID: 168c:0042 class-ID: 0280
IF: wlp1s0 state: up mac: <filter>
Info: services: NetworkManager, systemd-timesyncd, wpa_supplicant
Bluetooth:
Device-1: IMC Networks driver: btusb v: 0.8 type: USB rev: 1.1
speed: 12 Mb/s lanes: 1 mode: 1.1 bus-ID: 3-2.1:4 chip-ID: 13d3:3491
class-ID: e001
Report: btmgmt ID: hci0 rfk-id: 4 state: up address: N/A
Drives:
Local Storage: total: 1.14 TiB used: 325.28 GiB (27.8%)
SMART Message: Unable to run smartctl. Root privileges required.
ID-1: /dev/nvme0n1 maj-min: 259:0 vendor: Kingston
model: RBUSNS8154P3256GJ3 size: 238.47 GiB block-size: physical: 512 B
logical: 512 B speed: 15.8 Gb/s lanes: 2 tech: SSD serial: <filter>
fw-rev: E8FK1A.2 temp: 40.9 C scheme: GPT
ID-2: /dev/sda maj-min: 8:0 vendor: Western Digital model: WD Blue SA510
2.5 1000GB size: 931.51 GiB block-size: physical: 512 B logical: 512 B
speed: 6.0 Gb/s tech: SSD serial: <filter> fw-rev: 6100 scheme: GPT
Partition:
ID-1: / raw-size: 150 GiB size: 150 GiB (100.00%) used: 21.02 GiB (14.0%)
fs: btrfs dev: /dev/sda2 maj-min: 8:2
ID-2: /boot/efi raw-size: 260 MiB size: 256 MiB (98.46%)
used: 31.9 MiB (12.5%) fs: vfat dev: /dev/nvme0n1p1 maj-min: 259:1
ID-3: /home raw-size: 150 GiB size: 150 GiB (100.00%)
used: 21.02 GiB (14.0%) fs: btrfs dev: /dev/sda2 maj-min: 8:2
ID-4: /var/log raw-size: 150 GiB size: 150 GiB (100.00%)
used: 21.02 GiB (14.0%) fs: btrfs dev: /dev/sda2 maj-min: 8:2
ID-5: /var/tmp raw-size: 150 GiB size: 150 GiB (100.00%)
used: 21.02 GiB (14.0%) fs: btrfs dev: /dev/sda2 maj-min: 8:2
Swap:
Kernel: swappiness: 133 (default 60) cache-pressure: 100 (default) zswap: no
ID-1: swap-1 type: zram size: 17.5 GiB used: 0 KiB (0.0%) priority: 100
comp: zstd avail: lzo-rle,lzo,lz4,lz4hc,deflate,842 dev: /dev/zram0
Sensors:
System Temperatures: cpu: 64.5 C mobo: N/A gpu: amdgpu temp: 64.0 C
Fan Speeds (rpm): cpu: 2700
Info:
Memory: total: 20 GiB note: est. available: 17.5 GiB used: 10.08 GiB (57.6%)
Processes: 360 Power: uptime: 4h 20m states: freeze,mem,disk suspend: deep
avail: s2idle wakeups: 1 hibernate: platform avail: shutdown, reboot,
suspend, test_resume image: 6.98 GiB services: org_kde_powerdevil,
power-profiles-daemon, upowerd Init: systemd v: 257 default: graphical
tool: systemctl
Packages: 1422 pm: pacman pkgs: 1415 libs: 383 tools: octopi,paru,yay
pm: flatpak pkgs: 7 Compilers: gcc: 15.1.1 Shell: garuda-inxi default: fish
v: 4.0.2 running-in: konsole inxi: 3.3.38
Garuda (2.7.2-1):
System install date:     2025-06-25
Last full system update: 2025-06-27
Is partially upgraded:   No
Relevant software:       snapper NetworkManager dracut
Windows dual boot:       Probably (Run as root to verify)
Failed units:
2

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4 Likes
3

hi,

sounds for me as a technical stuff Hardware related maybe you can check if the Monitor is in ECO mode or Energy Safe Mode after certain time. Did you try unplug the Power cord from the Monitor and DP Cable for few Minutes . Plug Monitor Power back and DP Cable to see if its come on back on with the right Brightness. Which BOE monitor is it? Can you try the HDMI Port if it has one to check the same behavior?

4

its not ive checked with miltiple monitors with tons of different settings and it seems to be an issue related to garuda

5

my bad to hear that issue persist and its not hardware related. i had it one but it was my TV did go in energy mode and hangs until i did this Steps.

6

somehow it fixed itself ? i mean i did some updates but it didnt do anything imeidatly after this or after restarting . i just used the scrol wheel of the mouse on the icon to increase the brightness when it was already at 100% and somehow the brightess increased back to the internal settings … when i tried this before it didnt work…idk whats happening i guess a few updates and luck works but still