Messages in this thread | | | Date | Fri, 13 Nov 2009 12:13:54 +0900 | Subject | Re: [patch] added brightness feature to lcd class. | From | InKi Dae <> |
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Ok, I understood your answer. Just it was my idea for AMOLED LCD Panel. Both of them (AMOLED, TFT-LCD) do same thing in terms of brightness control as you said.
Thank you, Richard.
Best Regards, InKi Dae.
2009/11/11 Richard Purdie <rpurdie@linux.intel.com>: > On Wed, 2009-11-11 at 15:17 +0900, InKi Dae wrote: >> 2009/11/10 Richard Purdie <rpurdie@linux.intel.com>: >> > So you've tried this, what was the problem? Perhaps post this driver >> > code to illustrate your problem? >> >> all the cases worked fine. >> it's not whether lcd driver has a problem or not. >> I mean it's design issue of lcd class. AMOLED LCD Panel DOESN'T NEED >> backlight device. >> and I should have added brightness control feature to AMOLED LCD Panel >> driver not using backlight class >> because they have no BACKLIGHT DEVICE. >> >> in point of view AMOLED LCD Panel, brightness control is perfomed by >> gamma setting, not backlight power controlling. > > The question is whether this gamma control does the same thing as what > we've traditionally used the backlight brightness control for. As I > understand it, the answer is yes and to userspace making it appear as a > backlight brightness control makes sense. > > The userspace view of the world is key and the fact there is not a > traditional physical backlight in the hardware isn't really an issue. > > Why would we want to create two userspace interfaces doing the same > thing which would mean we just have to complicate userspace drivers? > Symlinking just makes things confusing. > > Cheers, > > Richard > > >
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