Today I decided to switch to the latest kernel (3.17-rc1) on my IdeaPad y510p. I hit only one annoying problem until now – after booting my main screen was dimmed. I tried all instructions from top google hits for all possible configurations of keywords linux, y510p, backlight issue, etc.

Especially I tried all methods from Arch Wiki.

Finally, I found the solution, by grepping modinfo for my Intel graphics card:

So simple modification in /etc/default/grub by adding kernel parameter to GRUB_CMDLINE_LINUX_DEFAULT fix the issue:

After that:

And all things should work fine.