Public bug reported:
I’m running Ubuntu 24.04 with kernel 6.11 on an ASUS ROG Zephyrus G16
GU605MI laptop.
Screen brightness control does not work. Neither /sys/class/backlight
interfaces nor software tools like xrandr have any effect. The device
uses hybrid graphics (Intel + NVIDIA), and all common kernel boot
parameters have been tested without success.
Model: ASUS ROG Zephyrus G16 GU605MI
Kernel: 6.11.0-26-generic
Display: Internal eDP panel (detected as eDP-1)
GPU: Intel iGPU + NVIDIA RTX 4060 Laptop GPU
/sys/class/backlight: Empty or only intel_backlight, which does nothing
Tried kernel parameters:
acpi_backlight=video
acpi_backlight=native
acpi_backlight=vendor
acpi_backlight=none
acpi_osi=Linux
Expected behavior:
Brightness should be adjustable using brightnessctl, /sys/class/backlight, or
xrandr.
Actual behavior:
/sys/class/backlight is missing or ineffective
xrandr --brightness has no effect
brightnessctl runs but does not change brightness
No visible EC or alternative brightness path is exposed
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2112165
Title:
Brightness control not working on ASUS ROG Zephyrus G16 GU605MI (no
usable backlight interface)
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