brightness gets really low when laptop not plugged in. i have set brightness to max in kde settings for both the cases and also in dell bios.
… and the issue persists?
yes it does
not necessarily a issue but in windows one can turn off adapdtive brightness through intel control app
I assume Dell Inspiron is a laptop model.
Seems it’s the screen backlight problem.
Before jumping to giving a possible solution, did you wipe the Windows OS?
There’s this problem that some laptop manufacturer turn off the screen backlight if no Windows OS found during booting (some said it’s Windows way to make sure it’s harder to install other OS).
If it is yes, then the solution is to let the GRUB turn on the screen backlight during booting.
You can change GRUB settings in /etc/default/grub.
In your current log-in (yes with your screen dim first), run in shell:
sudo sed "s/\(GRUB_CMDLINE_LINUX=\)\"\"/\1\"acpi_osi=Linux acpi_backlight=vendor\"/" /etc/default/grub -i
The sed command is to modify the entry GRUB_CMDLINE_LINUX="" of the GRUB configuration file /etc/default/grub to turn on the screen backlight.
You can double check if the entry is modified by running:
less /etc/default/grub
And find the GRUB_CMDLINE_LINUX entry.
Then run:
sudo update-grub
This command is to let GRUB take changes from the /etc/default/grub.
Once complete, reboot your laptop for the changes to take permanent effect.
Have you checked this?
https://wiki.archlinux.org/title/KDE#Power_management
powerdevil came pre-installed
yes
yes
thanks but this didn’t fix anything rather i wasn’t able to change my brightness after reboot. fortunately i had my grub config backed up
I don’t have much expertise in KDE, but i can at least suggest you to provide some basics.
inxi -Fazy -
System:
Kernel: 5.15.7-1-MANJARO x86_64 bits: 64 compiler: gcc v: 11.1.0
parameters: BOOT_IMAGE=/boot/vmlinuz-5.15-x86_64
root=UUID=edf1fd96-32cf-4167-b3ec-fc5c0406d7fa rw reboot=acpi quiet
apparmor=1 security=apparmor udev.log_priority=3 acpi_backlight=none
Desktop: KDE Plasma 5.23.4 tk: Qt 5.15.2 wm: kwin_x11 vt: 1 dm: SDDM
Distro: Manjaro Linux base: Arch Linux
Machine:
Type: Laptop System: Dell product: Inspiron 5502 v: N/A
serial: <superuser required> Chassis: type: 10 serial: <superuser required>
Mobo: Dell model: 0HWH1N v: A00 serial: <superuser required> UEFI: Dell
v: 1.8.0 date: 10/01/2021
Battery:
ID-1: BAT0 charge: 11.3 Wh (21.3%) condition: 53.0/53.0 Wh (100.0%)
volts: 15.6 min: 15.0 model: SMP DELL 9077G0A type: Li-poly serial: <filter>
status: Charging
CPU:
Info: model: 11th Gen Intel Core i5-1135G7 bits: 64 type: MT MCP
arch: Tiger Lake family: 6 model-id: 0x8C (140) stepping: 1 microcode: 0x88
Topology: cpus: 1x cores: 4 tpc: 2 threads: 8 smt: enabled cache:
L1: 320 KiB desc: d-4x48 KiB; i-4x32 KiB L2: 5 MiB desc: 4x1.2 MiB L3: 8 MiB
desc: 1x8 MiB
Speed (MHz): avg: 1199 high: 1325 min/max: 400/4200 scaling:
driver: intel_pstate governor: performance cores: 1: 1131 2: 1325 3: 1316
4: 1253 5: 1273 6: 1164 7: 935 8: 1195 bogomips: 22120
Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx
Vulnerabilities:
Type: itlb_multihit status: Not affected
Type: l1tf status: Not affected
Type: mds status: Not affected
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: Enhanced IBRS, IBPB: conditional, RSB filling
Type: srbds status: Not affected
Type: tsx_async_abort status: Not affected
Graphics:
Device-1: Intel TigerLake-LP GT2 [Iris Xe Graphics] vendor: Dell
driver: i915 v: kernel bus-ID: 0000:00:02.0 chip-ID: 8086:9a49
class-ID: 0300
Device-2: NVIDIA GP108M [GeForce MX330] driver: nvidia v: 495.44
alternate: nouveau,nvidia_drm bus-ID: 0000:2b:00.0 chip-ID: 10de:1d16
class-ID: 0302
Device-3: Realtek Integrated_Webcam_HD type: USB driver: uvcvideo
bus-ID: 3-6:4 chip-ID: 0bda:5538 class-ID: 0e02 serial: <filter>
Display: x11 server: X.org 1.21.1.2 compositor: kwin_x11 driver:
loaded: modesetting,nvidia unloaded: nouveau alternate: fbdev,nv,vesa
resolution: <missing: xdpyinfo>
OpenGL: renderer: Mesa Intel Xe Graphics (TGL GT2) v: 4.6 Mesa 21.2.5
direct render: Yes
Audio:
Device-1: Intel Tiger Lake-LP Smart Sound Audio vendor: Dell
driver: sof-audio-pci-intel-tgl
alternate: snd_hda_intel,snd_sof_pci_intel_tgl bus-ID: 0000:00:1f.3
chip-ID: 8086:a0c8 class-ID: 0401
Sound Server-1: ALSA v: k5.15.7-1-MANJARO running: yes
Sound Server-2: JACK v: 1.9.19 running: no
Sound Server-3: PulseAudio v: 15.0 running: no
Sound Server-4: PipeWire v: 0.3.40 running: yes
Network:
Device-1: Qualcomm Atheros QCA6174 802.11ac Wireless Network Adapter
vendor: Dell driver: ath10k_pci v: kernel bus-ID: 0000:2c:00.0
chip-ID: 168c:003e class-ID: 0280
IF: wlp44s0 state: up mac: <filter>
Bluetooth:
Device-1: Qualcomm Atheros type: USB driver: btusb v: 0.8 bus-ID: 3-10:5
chip-ID: 0cf3:e007 class-ID: e001
Report: rfkill ID: hci0 rfk-id: 0 state: down bt-service: enabled,running
rfk-block: hardware: no software: yes address: see --recommends
RAID:
Hardware-1: Intel Volume Management Device NVMe RAID Controller driver: vmd
v: 0.6 port: N/A bus-ID: 0000:00:0e.0 chip-ID: 8086:9a0b rev: class-ID: 0104
Drives:
Local Storage: total: 476.94 GiB used: 30.39 GiB (6.4%)
SMART Message: Unable to run smartctl. Root privileges required.
ID-1: /dev/nvme0n1 maj-min: 259:0 vendor: Toshiba
model: KBG40ZNS512G NVMe KIOXIA 512GB size: 476.94 GiB block-size:
physical: 512 B logical: 512 B speed: 31.6 Gb/s lanes: 4 type: SSD
serial: <filter> rev: 10410106 temp: 72.8 C scheme: GPT
Partition:
ID-1: / raw-size: 476.64 GiB size: 468.09 GiB (98.21%)
used: 30.39 GiB (6.5%) fs: ext4 dev: /dev/nvme0n1p2 maj-min: 259:2
ID-2: /boot/efi raw-size: 300 MiB size: 299.4 MiB (99.80%)
used: 288 KiB (0.1%) fs: vfat dev: /dev/nvme0n1p1 maj-min: 259:1
Swap:
Alert: No swap data was found.
Sensors:
System Temperatures: cpu: 52.0 C mobo: N/A
Fan Speeds (RPM): cpu: 3164
Info:
Processes: 286 Uptime: 15m wakeups: 764 Memory: 7.5 GiB
used: 3.06 GiB (40.8%) Init: systemd v: 249 tool: systemctl Compilers:
gcc: 11.1.0 Packages: pacman: 1265 lib: 339 flatpak: 0 Shell: Zsh v: 5.8
default: Bash v: 5.1.12 running-in: konsole inxi: 3.3.11
problem - brightness changes when on ac power
found it guys. only for dell laptop users. go to bios setup > display > turn off eco mode.
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