@ Steve,

It should a good thing to leave the "sysfs path", but the thing is that nearly 
everything vaio specific rely on the "sony-laptop" module. The issue here is 
that the backlight device is created with a sysfs path for every viao (see 
"http://www.linux.it/~malattia/wiki/index.php/Sony-laptop";), even when it 
doesn't work. For our models, we know that the backlight interface is broken, 
so we try to correct it within HAL (deleting sysfs path, giving a new 
access_method which works).
So maybe, deleting the "sysfs path" is something that should naturally be done 
when a device is wrongly created/configured...
The other reason why I deleted it was because I do not know If other 
scripts/fdi files will wrongly interact with it.
The best solution should be to modify "sony-laptop" module to correctly detect 
the card and do what smartdimmer does, but I don't have the necessary skills to 
do that.

Hum, I also modified the num levels since there is in fact only 18 ( 15
- 100 by step of 5 ) and the corresponding scripts.

Here are the files from which I build the package, containing all the 
modifications ( with the "prepobing & deleting sysfs path" solution). I hope it 
will help...
 


** Attachment added: "sony-smartdimmer.tar"
   http://launchpadlibrarian.net/29834497/sony-smartdimmer.tar

-- 
sony brighness on a geforce series older than 8 (nvclock works fine)
https://bugs.launchpad.net/bugs/277589
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