Boots: Try booting with the "acpi=off" kernel parameter Try booting with "pci=noacpi" Try booting with "noapic"
add: Option "RegistryDwords" "EnableBrightnessControl=1" I can control brightness but the OSD does not work properly: Try booting with the "acpi=off" kernel parameter Try booting with "pci=noacpi" OSD works and I can reduce brightness: Try booting with "noapic" Did not boot: Try booting with "acpi=ht" Try booting with "acpi=noirq" Try booting with "pnpacpi=off" -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/776999 Title: [Lenovo W520] laptop freezes on ACPI-related actions To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/776999/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
