Had the same issue after upgrading from lucid to precise an HP Pavilion g6. Solved with:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor" Thanks a lot! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/765438 Title: On startup, the backlight is off on laptop To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/765438/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
