[Work-around] Screen does not dim all the way [Sort of solved]

[Sinnis250]

Laptops screen brightness cannot go any lower than 5% in Linux Mint 21.

I've tried lowering the brightness with the F5 key but I still have a shadow background on my laptop screen at around 5% brightness even though it states that it has gone down to 0%

The Power Management tool gives the same result.

This worked OK on LM 20.3 but now, when I need less distraction when I am working with my external monitor, I have to close the laptop lid.

So its not a big inconvenience, only an irritation.

Has any one ran into this type of problem before and is there a fix?



Thanks

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System:
  Kernel: 5.15.0-46-generic x86_64 bits: 64 compiler: gcc v: 11.2.0 Desktop: Cinnamon 5.4.9
    tk: GTK 3.24.33 wm: Mutter dm: LightDM Distro: Linux Mint 21 Vanessa base: Ubuntu 22.04 jammy
Machine:
  Type: Laptop System: LENOVO product: 20FN003LUK v: ThinkPad T460 serial: <superuser required>
    Chassis: type: 10 serial: <superuser required>
  Mobo: LENOVO model: 20FN003LUK v: SDK0J40705 WIN serial: <superuser required> UEFI: LENOVO
    v: R06ET71W (1.45 ) date: 02/21/2022
Battery:
  ID-1: BAT0 charge: 16.6 Wh (98.2%) condition: 16.9/23.2 Wh (72.7%) volts: 12.2 min: 11.1
    model: SANYO 45N1773 serial: <filter> status: Not charging
  ID-2: BAT1 charge: 21.8 Wh (100.0%) condition: 21.8/23.5 Wh (93.0%) volts: 12.6 min: 11.4
    model: LGC 45N1127 serial: <filter> status: Full
  Device-1: hidpp_battery_0 model: Logitech M570 serial: <filter> charge: 95%
    status: Discharging
CPU:
  Info: dual core model: Intel Core i5-6200U bits: 64 type: MT MCP arch: Skylake rev: 3 cache:
    L1: 128 KiB L2: 512 KiB L3: 3 MiB
  Speed (MHz): avg: 1153 high: 1700 min/max: 400/2800 cores: 1: 500 2: 822 3: 1700 4: 1590
    bogomips: 19200
  Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx
Graphics:
  Device-1: Intel Skylake GT2 [HD Graphics 520] vendor: Lenovo driver: i915 v: kernel ports:
    active: eDP-1 empty: DP-1, DP-2, HDMI-A-1, HDMI-A-2 bus-ID: 00:02.0 chip-ID: 8086:1916
  Device-2: Acer ThinkPad P50 Integrated Camera type: USB driver: uvcvideo bus-ID: 1-10:6
    chip-ID: 5986:0706
  Display: x11 server: X.Org v: 1.21.1.3 driver: X: loaded: modesetting unloaded: fbdev,vesa
    gpu: i915 display-ID: :0 screens: 1
  Screen-1: 0 s-res: 1920x1080 s-dpi: 96
  Monitor-1: eDP-1 model: Chi Mei Innolux res: 1920x1080 dpi: 158 diag: 353mm (13.9")
  OpenGL: renderer: Mesa Intel HD Graphics 520 (SKL GT2) v: 4.6 Mesa 22.0.5 direct render: Yes
Audio:
  Device-1: Intel Sunrise Point-LP HD Audio vendor: Lenovo driver: snd_hda_intel v: kernel
    bus-ID: 00:1f.3 chip-ID: 8086:9d70
  Sound Server-1: ALSA v: k5.15.0-46-generic running: yes
  Sound Server-2: PulseAudio v: 15.99.1 running: yes
  Sound Server-3: PipeWire v: 0.3.48 running: yes
Network:
  Device-1: Intel Ethernet I219-V vendor: Lenovo driver: e1000e v: kernel port: N/A
    bus-ID: 00:1f.6 chip-ID: 8086:1570
  IF: enp0s31f6 state: down mac: <filter>
  Device-2: Intel Wireless 8260 driver: iwlwifi v: kernel pcie: speed: 2.5 GT/s lanes: 1
    bus-ID: 04:00.0 chip-ID: 8086:24f3
  IF: wlp4s0 state: up mac: <filter>
  IF-ID-1: tun0 state: unknown speed: 10 Mbps duplex: full mac: N/A
Bluetooth:
  Device-1: Intel Bluetooth wireless interface type: USB driver: btusb v: 0.8 bus-ID: 1-7:4
    chip-ID: 8087:0a2b
  Report: hciconfig ID: hci0 rfk-id: 0 state: up address: <filter> bt-v: 2.1 lmp-v: 4.2
    sub-v: 100
Drives:
  Local Storage: total: 447.13 GiB used: 43.4 GiB (9.7%)
  ID-1: /dev/sda vendor: SanDisk model: SSD PLUS 480GB size: 447.13 GiB speed: 6.0 Gb/s
    serial: <filter>
Partition:
  ID-1: / size: 220.84 GiB used: 43.37 GiB (19.6%) fs: ext4 dev: /dev/sda5
  ID-2: /boot/efi size: 96 MiB used: 30.2 MiB (31.5%) fs: vfat dev: /dev/sda1
Swap:
  ID-1: swap-1 type: file size: 2 GiB used: 0 KiB (0.0%) priority: -2 file: /swapfile
Sensors:
  System Temperatures: cpu: 37.0 C pch: 34.5 C mobo: N/A
  Fan Speeds (RPM): fan-1: 0
Repos:
  Packages: 2882 apt: 2855 flatpak: 14 snap: 13
  No active apt repos in: /etc/apt/sources.list
  No active apt repos in: /etc/apt/sources.list.d/google-earth-pro.list
  Active apt repos in: /etc/apt/sources.list.d/official-package-repositories.list
    1: deb https: //www.mirrorservice.org/sites/packages.linuxmint.com/packages vanessa main upstream import backport
    2: deb http: //archive.ubuntu.com/ubuntu jammy main restricted universe multiverse
    3: deb http: //archive.ubuntu.com/ubuntu jammy-updates main restricted universe multiverse
    4: deb http: //archive.ubuntu.com/ubuntu jammy-backports main restricted universe multiverse
    5: deb http: //security.ubuntu.com/ubuntu/ jammy-security main restricted universe multiverse
  No active apt repos in: /etc/apt/sources.list.d/sane-project-sane-release-focal.list
Info:
  Processes: 215 Uptime: 5h 35m Memory: 15.5 GiB used: 2.27 GiB (14.6%) Init: systemd v: 249
    runlevel: 5 Compilers: gcc: 11.2.0 alt: 11/9 Client: Cinnamon v: 5.4.9 inxi: 3.3.13

[Sinnis250]

I have a work around for the "blanking" or fully dimming my laptop screen without shutting the lid.

This is quite easily done.

Enter terminal command

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xrandr

to find which screen devices are attached to the laptop.

In my case, I have the laptops screen eDP-1 and monitor HDMI-2

Running the commands from terminal now allows me to do the following

Turn laptop screen off

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xrandr --output eDP-1 --off  

Turn laptop screen on

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xrandr --output eDP-1 --mode 1920x1080

Turn off monitor/external screen

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xrandr --output HDMI-2 --off

All assigned to Keyboard Bindings. Works a treat.

However your devices may differ.

This I suppose will have to suffice until something can be done about reducing the brightness control to an absolute zero in LM Power Management.