Seems like this is a kernel issue, with users of other Distros
experiencing the same problem.
A fix is:
Added file sony-laptop.conf with single line:
options sony-laptop kbd_backlight=1
to /etc/modprobe.d/ and it seems to work fine now.
As per http://www.fedoraforum.org/forum/showthread.php?t=268249
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https://bugs.launchpad.net/bugs/804595
Title:
Sony Vaio VPCS132FX/B Ambient Light sensor does not work
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