I have Ubuntu 13.10 in my dell inspiron 3521 with Intel core i5 and graphics of Intel Ivibridge Mobile. I can adjust the brightness of the screen. All the solutions that I found was to try to change the grub file as suggested in How do I get the brightness control working on a Lenovo Yoga 13? BUT I get my screen stop running when the screen get dimmed. BTW I have 2 lines in my grub file :
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" GRUB_CMDLINE_LINUX=""
I tried to change each one of them (and both) with no luck. Any suggestions ?