Backlight config

[viper]

I have been having problems with my ntb display brightness.
When any event related to chaning brightness is fired (brightness button, connection to power...) brightness is set to 0.
I tracked the problem down to the fact, that the system (not sure which part) uses scale 0..10 and clamps any higher value however intel-backlight expects 0..1500.

Setting via xbacklight or
brightnessctl works.
NTB: Acer F15
CPU: Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz
GPU: Intel Corporation HD Graphics 620 + NVIDIA Corporation GM107M [GeForce GTX 950M]
Manjaro (kernels tried 5.2, 4.9, 4.19)
DE: i3 + kde plasma

It started few weeks ago. Probably after some update.

I went throught the archwiki and tried all the kernel flags suggested. No success.

Thanks for any suggestions

[SGS]

How to provide good information in your posts

When asking questions in the forum, it would be most helpful to all members if you provide some basic information. When you provide info from the terminal, usually from your logs, you have to format it so the content is easy to read. First copy and paste your text/terminal/code into the post Then select the text/code and click the post edit toolbar button </> . Another handy way is to use 3 backticks ` at the start and 3 more at the end of the text like this: ``` Paste text or code here …

I down know ksy this happens

? Could you please explain ksy and more for non-native English people.
Start with

$ inxi -Fxxxza --no-host

[viper]

Hello SGS, thanks for giving me the lead.
The sentence you asked about was just misspelled and I cannot recall what I meant but it was not important - I have removed it.

There is result of the command you asked for (I did not know this command, therefore I tried to provide basic info by hand):

>>> inxi -Fxxxa --no-host

System:    Kernel: 5.2.11-1-MANJARO x86_64 bits: 64 compiler: gcc v: 9.1.0 
           parameters: BOOT_IMAGE=/boot/vmlinuz-5.2-x86_64 root=UUID=69dcb16c-0a21-4ce9-a92f-ab38a1c41e08 rw 
           acpi_backlight=none quiet resume=UUID=3acc1f6f-6cc3-4a78-ac76-010e70b95903 pcie_asmp=force 
           acpi_osi= 
           Desktop: i3 4.17.1 info: xfce4-panel, vala-panel dm: LightDM 1.30.0 Distro: Manjaro Linux 
Machine:   Type: Laptop System: Acer product: Aspire F5-573G v: V1.27 serial: <root required> 
           Mobo: Acer model: Captain_SK v: V1.27 serial: <root required> UEFI: Insyde v: 1.27 date: 05/26/2017 
Battery:   ID-1: BAT1 charge: 36.8 Wh condition: 41.1/62.2 Wh (66%) volts: 12.8/11.1 model: PANASONIC AS16B5J 
           type: Li-ion serial: 6276 status: Charging 
CPU:       Topology: Dual Core model: Intel Core i5-7200U bits: 64 type: MT MCP arch: Kaby Lake family: 6 
           model-id: 8E (142) stepping: 9 microcode: B4 L2 cache: 3072 KiB 
           flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 21704 
           Speed: 3100 MHz min/max: 400/3100 MHz Core speeds (MHz): 1: 3100 2: 3100 3: 3100 4: 3100 
           Vulnerabilities: 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, IBRS_FW, STIBP: conditional, RSB filling 
Graphics:  Device-1: Intel HD Graphics 620 vendor: Acer Incorporated ALI driver: i915 v: kernel 
           bus ID: 00:02.0 chip ID: 8086:5916 
           Device-2: NVIDIA GM107M [GeForce GTX 950M] vendor: Acer Incorporated ALI driver: nouveau v: kernel 
           bus ID: 01:00.0 chip ID: 10de:139a 
           Display: x11 server: X.Org 1.20.5 driver: intel,nouveau unloaded: modesetting 
           alternate: fbdev,nv,vesa compositor: compton resolution: 1920x1080~60Hz 
           OpenGL: renderer: Mesa DRI Intel HD Graphics 620 (Kaby Lake GT2) v: 4.5 Mesa 19.1.5 compat-v: 3.0 
           direct render: Yes 
Audio:     Device-1: Intel Sunrise Point-LP HD Audio vendor: Acer Incorporated ALI driver: snd_hda_intel 
           v: kernel bus ID: 00:1f.3 chip ID: 8086:9d71 
           Sound Server: ALSA v: k5.2.11-1-MANJARO 
Network:   Device-1: Qualcomm Atheros QCA9377 802.11ac Wireless Network Adapter vendor: Lite-On 
           driver: ath10k_pci v: kernel port: 4000 bus ID: 03:00.0 chip ID: 168c:0042 
           IF: wlp3s0 state: up mac: 94:e9:79:c6:46:4b 
           Device-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: Acer Incorporated ALI 
           driver: r8168 v: 8.047.02-NAPI port: 3000 bus ID: 04:00.1 chip ID: 10ec:8168 
           IF: enp4s0f1 state: down mac: a8:1e:84:06:ee:ca 
Drives:    Local Storage: total: 1.03 TiB used: 251.75 GiB (24.0%) 
           ID-1: /dev/sda vendor: Toshiba model: MQ01ABD100 size: 931.51 GiB block size: physical: 4096 B 
           logical: 512 B speed: 6.0 Gb/s rotation: 5400 rpm serial: Y67JPDENT rev: 5J scheme: GPT 
           ID-2: /dev/sdb vendor: Kingston model: RBUSNS8180S3128GI size: 119.24 GiB block size: 
           physical: 512 B logical: 512 B speed: 6.0 Gb/s serial: 50026B7E74A2DBDE rev: 60B9 scheme: GPT 
Partition: ID-1: / raw size: 39.09 GiB size: 37.98 GiB (97.15%) used: 30.09 GiB (79.2%) fs: ext4 
           block size: 4096 B dev: /dev/sdb5 
           ID-2: swap-1 size: 15.63 GiB used: 5.2 MiB (0.0%) fs: swap swappiness: 60 (default) 
           cache pressure: 100 (default) dev: /dev/sda8 
Sensors:   System Temperatures: cpu: 41.0 C mobo: N/A gpu: nouveau temp: 39 C 
           Fan Speeds (RPM): N/A 
Info:      Processes: 188 Uptime: 3d 17h 57m Memory: 15.53 GiB used: 3.34 GiB (21.5%) Init: systemd v: 242 
           Compilers: gcc: 9.1.0 clang: 8.0.1 Shell: zsh v: 5.7.1 running in: alacritty inxi: 3.0.36 

I tried find related records in journal, dmesg, and systemd status but I have found none (based on timestamp of occurence).

What else can I provide?