So, I was able to install the kernel version 3.11.0-999-generic. Once I rebooted, there was no difference. I changed the GRUB to
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor" AND GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi='!Windows 2012" AND GRUB_CMDLINE_LINUX_DEFAULT="acpi_osi=Linux acpi_backlight=vendor" acpi_osi=Linux acpi_backlight=vendor AND quiet splash acpi_osi='!Windows 2012 made it possible to lower the brightness to about halfway but it doesn't show the dialog that says the screen brightness is lowering. But quiet splash acpi_backlight=vendor shows the dialog but doesn't lower the screen brightness. I left the GRUB with GRUB_CMDLINE_LINUX_DEFAULT="acpi_osi=Linux acpi_backlight=vendor" for the meantime. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1173961 Title: [Gateway NV55C] Two backlight interfaces that wont adjust backlight. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1173961/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
