https://bugs.freedesktop.org/show_bug.cgi?id=98333
--- Comment #18 from Alex Deucher <alexdeuc...@gmail.com> ---
If the modes are only in the CEA extension block then this is a core drm issue.
The core EDID parser does not handles all of the CEA 4K modes yet. Patches
were proposed by several people, but I don't think any of them have gone
upstream yet due to various objections and bikeshedding. See:
https://lists.freedesktop.org/archives/dri-devel/2016-May/107463.html
https://lists.freedesktop.org/archives/dri-devel/2016-October/121434.html
https://lists.freedesktop.org/archives/dri-devel/2016-November/122631.html
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