Il 12/04/2011 17:20, Matthew Garrett ha scritto:
Hmm. How low is useful? There's no real problem with shifting everything by an offset.
I agree. The DSDT of any ALS equipped Vaio provides us 9 backlight levels (that are LCD/model specific), so the first and the last ones define our useful operating range, which is always different from 0-255 (eg. 13-255 for the Vaio S, 52-255 for the Vaio F, 7-182 for the Vaio Z, 7-213 for the Vaio TT and so on). However the code to retrieve and use those lower and upper bounds is still lacking upstream (I, Javier Achirica and many other people are testing a heavily modified sony-laptop.c written by us which includes lots of features that we might include soon, but there is no patchset yet). Moreover it is questionable whether to expose this "wire-range"/fine grain backlight device, which is intended to be used for an ambient light based regulation (that requires smooth transitions and sometimes minimal changes), while for normal backlight operations the 9 levels already mentioned should suffice.
Regards, Marco Chiappero -- To unsubscribe from this list: send the line "unsubscribe platform-driver-x86" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
