Public bug reported: Hardware: - Acer Aspire A715-76G - Intel Alder Lake iGPU - NVIDIA GeForce RTX 3050 Laptop GPU - Ubuntu 24.04 LTS - X11 Working kernel: 6.17.0-40-generic Broken kernel: 7.0.0-28-generic Problem: Brightness control stopped working after upgrading to Linux 7.0.0-28. The GNOME brightness slider moves normally. brightnessctl successfully changes: /sys/class/backlight/intel_backlight/brightness Example: brightnessctl set 10% reports success and the brightness value changes, but the physical display brightness never changes. Booting back into Linux 6.17.0-40 restores correct brightness control immediately. This appears to be a regression introduced in Linux 7.0. ** Affects: linux (Ubuntu) Importance: Undecided Assignee: Tran Vo Anh Tuan (jacktuan) Status: New ** Changed in: linux (Ubuntu) Assignee: (unassigned) => Tran Vo Anh Tuan (jacktuan) -- You received this bug notification because you are subscribed to linux in Ubuntu. Matching subscriptions: Bgg, Bmail, Nb https://bugs.launchpad.net/bugs/2161184 Title: Regression: Screen brightness no longer works on Acer Aspire A715-76G after upgrading from Linux 6.17.0-40 to 7.0.0-28 Status in linux package in Ubuntu: New Bug description: Hardware: - Acer Aspire A715-76G - Intel Alder Lake iGPU - NVIDIA GeForce RTX 3050 Laptop GPU - Ubuntu 24.04 LTS - X11 Working kernel: 6.17.0-40-generic Broken kernel: 7.0.0-28-generic Problem: Brightness control stopped working after upgrading to Linux 7.0.0-28. The GNOME brightness slider moves normally. brightnessctl successfully changes: /sys/class/backlight/intel_backlight/brightness Example: brightnessctl set 10% reports success and the brightness value changes, but the physical display brightness never changes. Booting back into Linux 6.17.0-40 restores correct brightness control immediately. This appears to be a regression introduced in Linux 7.0. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2161184/+subscriptions
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