https://bugzilla.kernel.org/show_bug.cgi?id=221381
Bug ID: 221381
Summary: LG Gram 16U70Q: Brightness keys send no ACPI signal on
6.8.0-110, worked on 6.8.0-38
Product: ACPI
Version: 2.5
Hardware: All
OS: Linux
Status: NEW
Severity: normal
Priority: P3
Component: Config-Other
Assignee: [email protected]
Reporter: [email protected]
Regression: No
On LG Gram 16U70Q-G laptop, the brightness keys (increase/decrease)
do not generate any ACPI events under kernel 6.8.0-110-generic.
Under kernel 6.8.0-38-generic the same keys work correctly.
Steps to reproduce:
1. Boot kernel 6.8.0-110-generic
2. Run: acpi_listen
3. Press brightness up or down key
4. No output is generated
Expected behavior:
acpi_listen should output events like:
video/brightnessdown BRTDN 00000087 00000000
System info:
- Laptop: LG Gram 16U70Q-G-AR36G
- OS: Linux Mint 22.3 Cinnamon
- Working kernel: 6.8.0-38-generic
- Broken kernels: 6.8.0-107-generic, 6.8.0-110-generic
- Backlight device: amdgpu_bl1 (AMD GPU)
- No acpi_backlight parameters set in working kernel
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