Additional regression information: Hardware: - Acer Aspire 7 A715-76G - Intel Alder Lake-P UHD Graphics (8086:46a3)
Working kernel: 7.0.0-27-generic Broken kernels: 7.0.0-28-generic 7.0.0-29-generic Results: Kernel 7.0.0-27: $ cat /sys/class/backlight/intel_backlight/max_brightness 19200 Brightness keys, GNOME brightness slider and direct writes to: /sys/class/backlight/intel_backlight/brightness all change the physical panel brightness. Kernel 7.0.0-29: $ cat /sys/class/backlight/intel_backlight/max_brightness 32767 The sysfs brightness value changes, but the physical panel brightness never changes. The following were tested without success: - acpi_backlight=native - removing acpi_backlight=native - writing directly to /sys/class/backlight/intel_backlight/brightness This appears to be a regression introduced after kernel 7.0.0-27. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2162884 Title: Regression: Intel backlight no longer works on Acer Aspire 7 after upgrade from 7.0.0-27 to 7.0.0-29 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2162884/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
