The Backlight/Brightness of my Notebook is always at 100%. When I’m pressing FN+F8(-)/F9(+) to set the brightness, the on-screen indicator pop up but nothing happen. My Notebook has no Optimus. The RTX Card is the only build in. After some researching, I checked several things. BIOS is Up2Date I…

I was able to install the 555.58 Driver with this installer script , which works surprisingly well for me. Now it is possible to control the Backlight/Brightness again.

Your notebook is is built on a Clevo P7xxTM1 barebone and the nvidia driver’s backlight control doesn’t work on that (at least on newer drivers, you might test the 470 driver). Brightness Controller doesn’t change the backlight brightness but instead changes the color profile to display darker colo…

No luck. I tried another Linux OS with Kernel 6.7.1 470 driver So, I assume this will not be fixed in the future. This is not too bad, because I can also control the brightness with software. Better than nothing. ¯_(ツ)_/¯

After using the nouveau driver 1:1.0.17-2build1 with Kernel 5.15.0-92-generic, the brightness control is working. So my Notebook is supported at least with the open source driver. How high is the chance to see this compatibility in the nvidia drivers? Is it somehow possible to check how the bright…

[image] gr33ke: Is it somehow possible to check how the brightness control is working with nouveau driver and using this in the nvidia drivers as a workaround? Near to zero, I already played around with the nvidia glue code trying to work around a similar bug on a different notebook. As soon …

That’s… disappointing. Is there a open Ticket/Request at Nvidia? Or how can I open one?

As a sidenote, previosly, the nvidia driver habe the module parameter nvidia.NVreg_EnableBacklightHandler=0 to turn off the backlight handler and fall back to the acpi backlight. Unfortunately, this parameter seems to be removed while still mentioned in the docs: https://http.download.nvidia.com/XF…

I also tried this parameter. But it is not working for me. It would be crazy when the parameter has no function but is still mentioned in the Installation and Configuration Instructions of the newest driver version. I opened a Ticket/Request to linux-bugs. I also mentioned this parameter, which ca…

I grepped through the nvidia sources and object files, it’s simply completely gone without notice and also the backlight handler code went from nvidia.ko to nvidia-modeset.ko module. If you’re bored, you could try hacky thing (though didn’t work last time): install the package linux-modules-extra …

Downloaded the Sources and replaced all entrys in nvidia-modeset/nvidia-modeset-linux.c as you mentioned. I need now some assistance, please. Because I don´t know how to recompile the driver. Is it the How to build guide on the Main Page?

Backlight/Brightness always at 100% NVIDIA RTX 2080 Mobile 535.154.05, Linux Mint 21.3 (Ubuntu 22.04)

Graphics / Linux Linux

generix February 5, 2024, 7:16pm 10

Previous thread for the same notebook:
https://forums.developer.nvidia.com/t/brightness-control-still-not-working-since-465/238507

You could send your bug report with the log and an acpidump to linux-bugs[at]nvidia.com

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Backlight/Brightness always at 100% NVIDIA RTX 2080 Mobile 535.154.05, Linux Mint 21.3 (Ubuntu 22.04)

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