Had problem on Lenovo W520 with Kubuntu 14.04 to get external VGA AND LVDS working. With Optimus no chance. Had to switch to discrete graphics in Bios. Nvidia drivers nogo. Switched to Nouveau i.e. reinstalled the driver. But than had problem with brightness on LVDS. Finally figured out working boot params:
GRUB_CMDLINE_LINUX_DEFAULT="agp=off quiet splash acpi_osi=linux thinkpad-acpi.brightness_enable=1 nox2apic" Other settings like recommended here https://wiki.ubuntu.com/Kernel/Debugging/Backlight did not work. Works for now. Will check next on docking station. -- 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
