Hi,
On Thu, Jan 5, 2017 at 9:52 AM, Daniel Vetter <daniel@xxxxxxxx> wrote:
On Thu, Jan 05, 2017 at 10:41:07AM +0200, Jani Nikula wrote:
> No matter what we do here, the question remains what to do with
> Chamelium. Changing the color range is really a workaround for
> Chamelium, not a fix. Using CEA range is perfectly fine per DP spec.
Can we just set a non-CEA mode/edid for chamelium, problem solved? We want
to do that anyway for HDMI, where you really have to do the limited range
dance to make stuff display correctly.
-Daniel
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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I shortly want to emphasize on this: https://lists.freedesktop.org/archives/intel-gfx/2015-November/081516.html
No matter what you sync with the Port - userspace must have a chance to know what happens with its DATA. It is a huge problem when the driver clamps by itself assuming everything it gets would be full range. Or when the Output device clamps and does not scale, then you loose, e.g. 0 ..16 and 235.. 255. On the other hand such scenarios make userspace scale data - especially video data - twice. One time to full range and later down in the driver when using CEA mode, e.g. Limited 16:235.
Please keep that in mind. It's problematic already nowadays when a 1:1 output without color altering is high importance.
Thanks very much
Peter
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