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 _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
