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I searched and found similar issues from years ago but the fixes do not work. I have a new Dell XPS 15 running elementary OS 5.1.7 and the brightness controls do not work. Here's what nvidia-smi is reporting:

+-----------------------------------------------------------------------------+ | NVIDIA-SMI 450.142.00 Driver Version: 450.142.00 CUDA Version: 11.0 | |-------------------------------+----------------------+----------------------+ | GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC | | Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. | | | | MIG M. | |===============================+======================+======================| | 0 GeForce GTX 1650 Off | 00000000:01:00.0 Off | N/A | | N/A 46C P0 5W / N/A | 5MiB / 3914MiB | 0% Default | | | | N/A | +-------------------------------+----------------------+----------------------+

+-----------------------------------------------------------------------------+ | Processes: | | GPU GI CI PID Type Process name GPU Memory | | ID ID Usage | |=============================================================================| | 0 N/A N/A 1161 G /usr/lib/xorg/Xorg 4MiB | +-----------------------------------------------------------------------------+

...and neofetch:

OS: elementary OS 5.1.7 Hera x86_64

Host: XPS 15 7590

Kernel: 5.4.0-80-generic GPU: NVIDIA NVIDIA Corporation Device 1f91

GPU: Intel Device 39b Memory: 2276MiB / 15647MiB

Any ideas on how to fix this?

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  • To add, the slider moves but there is no change in brightness which seems to be set at max. – AnthonyG Jul 21 at 13:10
  • Also tested this with Version 6 Beta 2 and same issue. I really want to use Elementary OS on this new laptop but this is a deal breaker. Does anyone know how to get this working? – AnthonyG Jul 21 at 19:29
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Maybe this is a kernel compatibility problem, maybe because your laptop is very new the screen brightness module is not yet built in 5.4.0-80-generic, try installing a more recent kernel.

If you'd like to try i suggest the Liquorix kernel or the Xanmod kernel, our maybe just install a mainline kernel with Ubuntu Mainline Kernel Installer.

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Actually it turns out to be an OLED issue with all Linux distros. Returning the laptop and purchasing one that doesn’t have an OLED display.

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