I have a Dell Precision 7760 with an A5000 used in discrete-only graphics mode. I can’t adjust the backlight brightness on this laptop by using /sys/class/backlight/nvidia_0/brightness (either write()ing ASCII decimal strings from 0 to 100 manually or by using xbacklight) when using the proprietary driver at version 525.89.02 or 530.30.02. This still works with 515.86.01, which I am now currently running again. I don’t have an nvidia-bug-report.log.gz to share. I can get and post one, if necessary, but switching graphics driver versions is inconvenient.
Install Kubuntu 22.04 or kDE Neon with OEM kernel 6.2+
22.04 is hardware certified for your model.
Install the complete and correct kernel parameters.
Install nvidia 535.
Check your system.
Is the nvidia driver fully loaded>
Does dell_wmi need to be loaded?
Prove to yoursellf the the invidia driver is installed absolutely correctly.
Check lsmod to see what is loaded for video and if dell_wmi is loaded.
Ubuntu 22.04 ( ecosystem) is certified for your exact hardware.
22.04 can be crafted to be as nearly as bleeding as Arch but 1000% more stable if you use the right sources and PPA.
Dell has their own Ubuntu 22.04 repos for their hardware.
In the normal repo you can install the OEM 6.02 kernel and OEM keyring.
I suspect the 22.04 OEM 6.02 kernel would resolve your issue most likely having the dell_wmi module option enabled by default.
I suggest using.
Latest Production Branch Version:
[535.86.05] or what ever the Latest Production Branch Version is.
“Please also generate and post an “nvidia bug report” by running nvidia-bug-report.sh as root.”
Have you read your sudo dmesg?
A Hardware / Software issue requires Hardware/ Software information to formulated a Hardware / Software Solution.
The amount, accuracy and relevance of the Hardware/ Software information provided is directly indicative of the amount, accuracy and relevance of the Hardware/ Software solution formulated.
note: The kernel parameter apci_osi=Linux can be used in newer (late 2019 and later) Asus laptops.
It may take upto 3 clean/ safe/ slow system shutdowns for kernel parameters to take effect.
“I have nvidia.NVreg_RegistryDwords=EnableBrightnessControl=1 acpi_backlight=native in my GRUB_CMDLINE_LINUX_DEFAULT .”
So you’ve enabled the nVidia Driver backlight handler and then enabled If set to native, use the device’s native backlight mode.
The first and last thing I would try after fixing the kernel parameters and safely power cycling the system twice so the kernel parameters take effect… would to run:
lsmod and make sure the dell_wmi module is loading at boot by setting parameters in /etc/default/grub and /etc/modprobe.d/dell_wmi.conf
maybe it looks something like :
anyway. Thats my ramble. mhope it helps. good luck!