I have upgraded to 13.04 on my lenovo y580 and all seems well except I can't get my backlight setting to work. The hotkeys are not working and when I open the backlight settings, there is no way to adjust it. After searching around, I have changed several parameters in the /etc/default/grub and nothing has worked. From reading around it seems as thought it may be a kernel issue??
I have tried
as well as
to no avail.
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=\'!Windows 2012\'"
Was wondering if anyone else out there with the same laptop has expericend this issue. It's killing my battery life and I would love to fix it.