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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13.04 is not fully baked yet. Questions about future versions are off topic. – user68186 Mar 01 '13 at 14:53
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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 - http://askubuntu.com/questions/18641/theres-an-issue-with-an-alpha-beta-release-of-ubuntu-what-should-i-do – fossfreedom Mar 01 '13 at 14:55