There is solution for 12.10, but it doesn't work for 13.04.(Build from 28February)
Any idea what is wrong with 13.04 version and how to fix it?
Additional info: In /sys/class/backlight/ I have: ideapad and intel_backlight, no signs of acpi_video0
closed as off topic by fossfreedom♦ Mar 1 '13 at 14:55
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