2013/5/20 Daniel Vetter <dan...@ffwll.ch> > On Sat, May 18, 2013 at 12:39:14AM +0200, Jan Hinnerk Stosch wrote: > > Hallo, > > > > I hope this is the right place to ask, because I actually don't know > > whether it is a bug or a feature that I'm experiencing since linux 3.9: > > When I boot my system the backlight gets extremely bright compared to > older > > kernel versions. It is most obvious when I leave X (more a yellow than a > > black background), but I have the impression, that the colors in X are > > brighter than usual, too. > > I used my spare time this afternoon to do a kernel bisect and learned > that > > the first "bad" commit is 55bc60db5988c8366751d3d04dd690698a53412c. As I > > don't have insight or understanding of the code: Is this behaviour > intended > > and how could I change it to the old state or is it a bug and should I > > report it somewhere? > > My system is as follows: > > Intel i5-3570k with Intel HD 4000 > > my monitor is connected via HDMI. > > If you need any more information just tell me. > > Yeah, this is a feature. HDMI has (for oddball backwards compat with > analog TV signals) a special mode which reduces the useable RGB value > range by chopping off about 10% at the bottom and top end. This results in > light colors getting brighter and dark colors getting darker. > > The above mentioned commit tries (to the best of our knowledge) to > auto-set the option which most likely fits what the hdmi sink will do with > the color data. You can either fix this up in the hdmi sink with the > on-screen menu or by manually setting the "RBG Broadcast" property for the > relevant hdmi connector to the setting you want. > > Cheers, Daniel > -- > Daniel Vetter > Software Engineer, Intel Corporation > +41 (0) 79 365 57 48 - http://blog.ffwll.ch >
Ok, thank you for your detailed explanation. Regards, jhs
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