Ubuntu
linux package

  1. Bug #776999
  2. Comment #84

Comment 84 for bug 776999

Revision history for this message
prs (peteo) wrote :

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.