The flow of brightness hotkey is as follows key pressed -> ec triggers events -> bios/os performs a series of following functions -> ... -> ACPI EV5 -> ACPI BRT6 -> ACPI Notify LCD 0x86/0x87 -> ACPI VGA driver generates keycodes -> userspace write to /sys/class/backlight/intel_backlight/brightness
It is possible to manually perform functions in ACPI EV5 and later. EV5 and later does not freeze screen, hardware and BIOS are likely to be blamed; otherwise, it is possible to further narrow down which parts break and identify the responsible drivers. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1891032 Title: Brightness key freeze screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1891032/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
