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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - DisplayPort always defaults to incorrect limited-range RGB on Intel Graphics for 24bpp+ displays"
href="https://bugs.freedesktop.org/show_bug.cgi?id=107476#c4">Comment # 4</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - DisplayPort always defaults to incorrect limited-range RGB on Intel Graphics for 24bpp+ displays"
href="https://bugs.freedesktop.org/show_bug.cgi?id=107476">bug 107476</a>
from <span class="vcard"><a class="email" href="mailto:nicholas.stommel@gmail.com" title="Nicholas Stommel <nicholas.stommel@gmail.com>"> <span class="fn">Nicholas Stommel</span></a>
</span></b>
<pre>(In reply to Rodrigo Vivi from <a href="show_bug.cgi?id=107476#c3">comment #3</a>)
<span class="quote">> Nicholas, on that other bugzilla entry you mentined that with same monitor,
> same machine the ranges are differente with different connectors (DP vs
> HDMI), right?
> If, so, could you provide logs of both cases?</span >
Rodrigo, thank you for your consideration and for moving the discussion here,
as I agree the primary issue is related to incorrect automatic range detection
for DisplayPort. Yes, you are right: on the same machine, HDMI range detection
works correctly on every display I have tried, but never works correctly with
DisplayPort (on Linux, I should add. Intel's Windows drivers always correctly
select full-range RGB over DisplayPort for the displays I have tried).
Michal's comment from <a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL] LSPCon and DisplayPort always output limited range RGB, even when it should output full range RGB"
href="show_bug.cgi?id=100023">https://bugs.freedesktop.org/show_bug.cgi?id=100023</a> is
useful here because I think it summarizes the issue quite well:
(In reply to Michał Kopeć from <a href="show_bug.cgi?id=107476#c21">comment 21</a>)
<span class="quote">> DisplayPort output defaults to 16-235 color range, while any other outputs
> on the laptop will correctly output 0-255 full RGB. There is currently no
> way to set the driver to default to Full RGB regardless of what the display
> EDID is.</span >
In accordance with <a href="https://01.org/linuxgraphics/documentation/how-report-bugs">https://01.org/linuxgraphics/documentation/how-report-bugs</a>,
I can provide the information needed. As this is a 'DRM Kernel' bug, I will
provide logs from my system running the latest drm-tip branch of the kernel.</pre>
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