Monitor Brightness Cannot Be Adjusted

[crawf1]

Hi Everyone,

I have Linux Mint 20.3 (cinnamon) installed on my laptop (Thinkpad T15 ). When I connect my laptop to my monitor (Lenovo). I cant adjust screen brightness on the monitor. Can't seem to find much about this online. Am I missing something?

Any help in resolving this problem would be greatly appreciated.

Thanks,

Crawf.

[Hoser Rob]

The make/model isn't nearly enough info. Copy/paste the text output of inxi -Fxxxrz run in the terminal.

[crawf1]

As requested here is said output.

Code: Select all

System:    Kernel: 5.15.0-53-generic x86_64 bits: 64 compiler: N/A Desktop: Cinnamon 5.2.7 wm: muffin 5.2.1 dm: LightDM 1.30.0 
           Distro: Linux Mint 20.3 Una base: Ubuntu 20.04 focal 
Machine:   Type: Laptop System: LENOVO product: 20S6CTO1WW v: ThinkPad T15 Gen 1 serial: <filter> Chassis: type: 10 
           serial: <filter> 
           Mobo: LENOVO model: 20S6CTO1WW v: SDK0J40700 WIN serial: <filter> UEFI: LENOVO v: N2XET15W (1.05 ) date: 04/27/2020 
Battery:   ID-1: BAT0 charge: 52.1 Wh condition: 52.9/57.0 Wh (93%) volts: 12.8/11.5 model: SMP 5B10W13914 type: Li-poly 
           serial: <filter> status: Not charging cycles: 13 
           Device-1: hidpp_battery_0 model: Logitech Wireless Mouse serial: <filter> charge: 55% (should be ignored) 
           rechargeable: yes status: Discharging 
           Device-2: hidpp_battery_1 model: Logitech Wireless Keyboard K540/K545 serial: <filter> 
           charge: 100% (should be ignored) rechargeable: yes status: Discharging 
CPU:       Topology: Quad Core model: Intel Core i5-10210U bits: 64 type: MT MCP arch: Kaby Lake rev: C L2 cache: 6144 KiB 
           flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 33599 
           Speed: 700 MHz min/max: 400/1600 MHz Core speeds (MHz): 1: 700 2: 700 3: 700 4: 700 5: 700 6: 700 7: 700 8: 700 
Graphics:  Device-1: Intel UHD Graphics vendor: Lenovo driver: i915 v: kernel bus ID: 00:02.0 chip ID: 8086:9b41 
           Display: x11 server: X.Org 1.20.13 driver: modesetting unloaded: fbdev,vesa resolution: 1920x1080~60Hz 
           OpenGL: renderer: Mesa Intel UHD Graphics (CML GT2) v: 4.6 Mesa 21.2.6 direct render: Yes 
Audio:     Device-1: Intel vendor: Lenovo driver: sof-audio-pci-intel-cnl bus ID: 00:1f.3 chip ID: 8086:02c8 
           Sound Server: ALSA v: k5.15.0-53-generic 
Network:   Device-1: Intel Wireless-AC 9462 driver: iwlwifi v: kernel port: 4000 bus ID: 00:14.3 chip ID: 8086:02f0 
           IF: wlp0s20f3 state: up mac: <filter> 
           Device-2: Intel Ethernet I219-V vendor: Lenovo driver: e1000e v: kernel port: efa0 bus ID: 00:1f.6 
           chip ID: 8086:0d4f 
           IF: enp0s31f6 state: down mac: <filter> 
Drives:    Local Storage: total: 476.94 GiB used: 161.80 GiB (33.9%) 
           ID-1: /dev/nvme0n1 vendor: Samsung model: MZVLB512HBJQ-000L7 size: 476.94 GiB speed: 31.6 Gb/s lanes: 4 
           serial: <filter> rev: 4M2QEXF7 scheme: GPT 
Partition: ID-1: / size: 467.89 GiB used: 161.80 GiB (34.6%) fs: ext4 dev: /dev/nvme0n1p2 
Sensors:   System Temperatures: cpu: 28.0 C mobo: N/A 
           Fan Speeds (RPM): fan-1: 0 
Repos:     No active apt repos in: /etc/apt/sources.list 
           Active apt repos in: /etc/apt/sources.list.d/brave-browser-release.list 
           1: deb [signed-by=/usr/share/keyrings/brave-browser-archive-keyring.gpg arch=amd64] https://brave-browser-apt-release.s3.brave.com/ stable main
           Active apt repos in: /etc/apt/sources.list.d/nodesource.list 
           1: deb [signed-by=/usr/share/keyrings/nodesource.gpg] https://deb.nodesource.com/node_16.x focal main
           2: deb-src [signed-by=/usr/share/keyrings/nodesource.gpg] https://deb.nodesource.com/node_16.x focal main
           Active apt repos in: /etc/apt/sources.list.d/nordvpn.list 
           1: deb https://repo.nordvpn.com/deb/nordvpn/debian stable main
           Active apt repos in: /etc/apt/sources.list.d/oem-sutton.simon-bailee-meta.list 
           1: deb http://lenovo.archive.canonical.com/ focal sutton
           2: deb http://lenovo.archive.canonical.com/ focal sutton.simon
           Active apt repos in: /etc/apt/sources.list.d/official-package-repositories.list 
           1: deb http://packages.linuxmint.com una main upstream import backport #id:linuxmint_main
           2: deb http://archive.ubuntu.com/ubuntu focal main restricted universe multiverse
           3: deb http://archive.ubuntu.com/ubuntu focal-updates main restricted universe multiverse
           4: deb http://archive.ubuntu.com/ubuntu focal-backports main restricted universe multiverse
           5: deb http://security.ubuntu.com/ubuntu/ focal-security main restricted universe multiverse
           6: deb http://archive.canonical.com/ubuntu/ focal partner
           Active apt repos in: /etc/apt/sources.list.d/skype-stable.list 
           1: deb [arch=amd64] https://repo.skype.com/deb stable main
           Active apt repos in: /etc/apt/sources.list.d/yarn.list 
           1: deb https://dl.yarnpkg.com/debian/ stable main
Info:      Processes: 293 Uptime: 12h 28m Memory: 15.29 GiB used: 3.18 GiB (20.8%) Init: systemd v: 245 runlevel: 5 Compilers: 
           gcc: 9.4.0 alt: 9 Shell: bash v: 5.0.17 running in: gnome-terminal inxi: 3.0.38

[Pjotr]

Try this progressive scheme:
https://easylinuxtipsproject.blogspot.c ... y.html#ID4
(item 4 and further)

[crawf1]

no luck with the above...

[SMG]

I have Linux Mint 20.3 (cinnamon) installed on my laptop (Thinkpad T15 ). When I connect my laptop to my monitor (Lenovo). I cant adjust screen brightness on the monitor. Can't seem to find much about this online. Am I missing something?

Does your external monitor not have buttons on it to adjust the brightness? I do not see where you have let us know the make and model of the monitor.

The inxi output you provided does not show a monitor attached. What port are you using to connect the monitor and what type of cable are you using? Also let us know if you are using a dock.