[Bug 2148694] [NEW] LG Gram 16U70Q: Brightness keys send no ACPI signal on 6.8.0-110, worked on 6.8.0-38

Public bug reported: 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 ** Affects: linux (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are subscribed to linux in Ubuntu. Matching subscriptions: Bgg, Bmail, Nb https://bugs.launchpad.net/bugs/2148694 Title: LG Gram 16U70Q: Brightness keys send no ACPI signal on 6.8.0-110, worked on 6.8.0-38 Status in linux package in Ubuntu: New Bug description: 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2148694/+subscriptions