I have a Thinkpad T520 with Nvidia NVS 4200M, using proprietary drivers. It also freezes whenever brightness is turned up/down. Disabling VT-d fixes the crashes when trying to turn up/down brightness but disables brightness (adjusting brightness does not work).
Disabling ACPI is not a good workaround, as this disables ALL power management and makes it so that Ubuntu fails to recognize the laptop as a laptop. It breaks the "power plugged in" light on the laptop. I think this warrants that the Thinkpad series of laptops is no longer advised as "compatible" with Ubuntu. I bought this laptop because of that recommendation and feel cheated! The recommendation is dishonest. -- 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 [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
