Ok, if set brightness_in_hardware to false it work fine.
Since this problem is present in many\all SonyVAIO Laptop, this workaround can 
be included in hal-info?
For example matching this at "hardware.vendor = Sony" indipendently by a 
specific model?
By me I can confirm that this issue afflicts the E and S series (and I think F 
serie too) but reading many forum this problem afflict many\all SonyVAIO Laptop.

Thank you for great work!

-- 
Powerdevil brightness OSD does not display if 
laptop_panel.brightness_in_hardware = true
https://bugs.launchpad.net/bugs/461524
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