[Bug 107476] DisplayPort and LSPCON always defaults to incorrect limited-range RGB on Intel Graphics for 24bpp+ displays

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107476

Nicholas Stommel <nicholas.stommel at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW

--- Comment #18 from Nicholas Stommel <nicholas.stommel at gmail.com> ---
(In reply to Jani Nikula from comment #17)
> Created attachment 141060 [details] [review]
> drm/i915: set DP Main Stream Attribute for color range on DDI platforms
> 
> Please try this patch on top of an otherwise unmodified kernel. Untested,
> but I'm feeling optimistic enough about it that I wrote a proper commit
> message. Fingers crossed.

Jani, this really works! Fantastic! I applied the patch directly onto today's
unmodified drm-tip kernel from git://anongit.freedesktop.org/drm-tip and it
completely works now! I tried this on three different DisplayPort monitors, and
I am delighted to report that the problem is resolved. Full-range RGB color is
appropriately selected on my 24bpp True Color monitors over DisplayPort. Your
optimism was completely warranted, this totally fixes my DisplayPort woes on
Linux! You have my sincerest praise, I'm so glad you resolved this issue. 

And to think, that "After all these years, the fix boils down to flipping one
bit." I am absolutely overjoyed here. I would like to thank Rodrigo Vivi as
well for his help. Thank you so very, very much for looking into this bug and
fixing the unexpected root of the problem. I expect to see your fix applied
upstream as soon as possible. :)

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