This bug also hit me - but I can confirm, that after booting with "pci=noacpi" and adding the EnableBrightnessControl option almost everything works like a charm for me: Almost - just the OSD of the brightness control is shown but does not follow the brightness change - but I can live with that... ;-)
My config: W520 NY549GE/428449G Nvidia Quadro 2000M, 16Gb, Nvidia 280.13 Natty with 2.6.39 Kernel -- 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
