[Bug 55121] Limited color range on screen that is connected via HDMI [SandyBridge]

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=55121





--- Comment #9 from Daniel Vetter <daniel at ffwll.ch>  2013-04-11 09:11:54 ---
On Thu, Apr 11, 2013 at 11:00 AM,  <bugzilla-daemon at bugzilla.kernel.org> wrote:
>> I was just trying to figure out how can we emerge from this, if specs werent
>> followed strictly - problems are bound to happen either way and the only thing
>> that can help the end user is to set the parameters himself. Personally I'm
>> wondering is there a way and how ?
>
> The only chance I see is that we'd detect somehow that the display is using
> full range by default. I was thinking that it might be a more general issue
> with monitors, whereas TVs would be more likely to use limited range. But
> unfortunately I don't know of any way to tell TVs and monitors apart based on
> the EDID information. A blacklist would be another option, but that approach
> won't scale very well.

At least my 24" desktop screens from HP here implement the
limited/full color range stuff according to spec on HDMI. So I don't
think it's an issue with TV vs. computer screens, but probably more
with sloppy/cheap vs. not-so-cheap ...

I think this is not a game we can't win, but with the automatic mode
we should at least make conformant hw work. Anything else needs manual
configuration anyway :(
--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch

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