On Wed, Apr 13, 2011 at 06:50:34PM +0200, Marco Chiappero wrote: > 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. Can this code be merged within the next week? If not I agree that it'd be better to drop this patch for now. I think exposing the full range of (usable) brightness values makes sense, since ALS policy is likely to be determined in userspace - we'll need some way to expose the appropriate mapping, but that's something that needs to be handled generically in the long run. -- Matthew Garrett | mjg59@xxxxxxxxxxxxx -- 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
