I'm also affected. I thought things were going well with my W520: I got 12.04 64-bit working in discrete mode with Unity3D and it was all good until I installed VirtualBox and realized that VT-X was turned off in my BIOS. I turned it on and then could no longer boot (I need fast virtual machines so disabling VT-X isn't an option for me).
My current symptom is that it will boot with a lot of long pauses, show the purple blank screen, sometimes show the 'Ubuntu' screen with four progress dots, and eventually hang on a BusyBox screen after saying "(initramfs)". I think I need to go down to 32-bit. -- 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
