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Can't adjust screen brightness on lenova y410p. I'm running unbutu 13.10. I tried different answers on here but nothing seems to work.

I changed GRUB_CMDLINE_LINUX in /etc/default/grub to include acpi_backlight=vendor

One think different then other people have said is I don't have /sys/class/backlight/intel_backlight

ls /sys/class/backlight

ideapad thinkpad-screen

I've tried changing the value ideapad/brightness and thinkpad-screen/brightness

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