This bug seems to had make a comeback since driver 475, where brightness could not be changed and was stuck on a low value. Now, the opposite occurs, where brightness is stuck on a high value instead. OS: Fedora 39 Running Wayland, but also happens on X11.

Thanks, everybody. I was able to reproduce the symptom on a Lenovo Legion laptop in discrete-GPU-only mode: with a 545 driver, I can observe that the value in /sys/class/brightness/nvidia_0/brightness changes when I hit the brightness hotkeys, but the screen’s actual brightness remains unchanged. (I…

I am running Ubuntu 23.10 on an nVIDIA GeForce RTX 2060 laptop. I just installed the New Feature Branch driver 545.29.02 from PPA for Canonical Kernel Team : “Canonical Kernel Team” team This ppa is used for building pre-release and test kernels. It IS NOT RECOMMENDED that you subscri…

I have experienced the same, it seems to be a regresshion, /sys/class/backlight/nvidia_0/actual_brightness contains the correct brightness value but the actual screen brightness doesn’t get changed.

Thanks for the bug report. @amrits is there a bug filed to track the next steps?

Backlight issues frequently are specific to particular notebook system designs: @BertRAMAerts @Moody.Liu could you please provide detailed information about what notebook systems you are observing these symptoms on?

Thanks. Some of the Legion 5 notebooks have “Advanced Optimus” and should be using the nvidia_wmi_ec_backlight driver. Do you have a /sys/class/backlight/nvidia_wmi_ec_backlight device in sysfs? I notice that you are setting ‘acpi_backlight=native’ on your kernel command line, so perhaps you’ve alr…

Oops, I didn’t scroll up far enough to see the actual OP of this thread. @robotta2 , same question to you: could you please provide detailed information about the notebook system you are observing the symptom on?

I have similar problem on Legion 5 Pro 16ACH6 2021 which uses NVIDIA® GeForce RTX™ 3050 Ti 4GB GDDR6 I’m using kernel linux-zen 6.5.9.zen2-1 on archlinux without extra acpi-related options While trying to find workaround I’ve tried to change acpi_backlight kernel parameter which did not help I’m …

bert@legion5ubuntu:/sys/class/backlight$ ls -al total 0 drwxr-xr-x 2 root root 0 Nov 3 09:37 . drwxr-xr-x 86 root root 0 Nov 3 09:37 .. lrwxrwxrwx 1 root root 0 Nov 3 08:37 nvidia_0 -> ../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/backlight/nvidia_0 So no /sys/class/backlight/nvidia_wmi_…

Sure, here are my laptop specs: Operating System: Fedora Linux 39 KDE Plasma Version: 5.27.9 KDE Frameworks Version: 5.111.0 Qt Version: 5.15.10 Kernel Version: 6.5.6-300.fc39.x86_64 (64-bit) Graphics Platform: Wayland Processors: 8 × Intel® Core™ i7-7700HQ CPU @ 2.80GHz Memory: 15.3 GiB of …

[NVIDIA Beta driver 545.23.06] Brightness not working / changing

Graphics / Linux Linux

BertRAMAerts November 3, 2023, 4:55pm 6

My laptop:
81Y6 Lenovo Legion 5 15IMH05H
NVIDIA GeForce RTX 2060 Mobile
Intel i7-10750H (12) @ 5.000GHz

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[NVIDIA Beta driver 545.23.06] Brightness not working / changing

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