[Bug 108081] LG 31MU97 monitor native resolution is 4096x2160, but highest mode found is 3840x2160

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108081

--- Comment #23 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to Brian Vincent from comment #22)
> Created attachment 141863 [details]
> dmesg drm-tip amdgpu machine drm.debug=0x1e
> 
> I'm attaching dmesg with drm-tip on the amdgpu machine with drm.debug=0x1e
> 
> So this amdgpu machine is a desktop, with the monitor directly plugged into
> the video card with a full sized displayport cable.
> 
> 
> More information on the problematic i915 laptop setup:
> 
> It's a Dell XPS 15 9560.  It's connected to a TB16 thunderbolt docking
> station.

Ah. Yes that would explain why amdgpu doesn't do mst. It's not the sink that's
mst, it's just the dock. Still doesn't explain why i915 in sst mode didn't find
the second extension block, and why in mst mode the extension block was
corrupted even with the no_stop_bit patch.

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