No ACPI interrupts means either BIOS is broken or system is using other mechanism like scancode from KBC/EC.
Checking scancode is easy: sudo showkey -s Also checking interrupts: watch -n1 cat /proc/interrupts <-- usually IRQ 1 If there aren't events from KBC/EC, this is a BIOS or a KBC/EC bug. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1872311 Title: Brightness hotkeys not working on Lenovo S740 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1872311/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
