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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

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closed as off topic by fossfreedom Mar 1 '13 at 14:55

Questions on Ask Ubuntu are expected to relate to Ubuntu within the scope defined by the community. Consider editing the question or leaving comments for improvement if you believe the question can be reworded to fit within the scope. Read more about reopening questions here.If this question can be reworded to fit the rules in the help center, please edit the question.

    
13.04 is not fully baked yet. Questions about future versions are off topic. –  user68186 Mar 1 '13 at 14:53
    
Hi and welcome to Ask Ubuntu - as per the FAQ, alpha/beta issues are off-topic. You can receive help as per this Q&A - askubuntu.com/questions/18641/… –  fossfreedom Mar 1 '13 at 14:55