[Bug 221430] nvidia_wmi_ec_backlight: brightness writes silently dropped on HP OMEN 16 (2025)

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=221430

--- Comment #7 from floquimaurice@gmail.com ---
Hi Hans,

I added acpi_backlight=native nvidia_wmi_ec_backlight.force=1 (and
nvidia.NVreg_EnableBacklightHandler=0) to my kernel command line.

Here are the folders that appeared in /sys/class/backlight/:

    intel_backlight (max_brightness: 192000)

    nvidia_0 (max_brightness: 100)

    nvidia_wmi_ec_backlight (max_brightness: 100)

I tried echoing different values into the brightness file for each of these
three folders. The commands were accepted without any errors, but the physical
screen brightness did not change at all.

I am just reporting the facts here. Let me know if you need me to run any other
specific commands or tests!

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