[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 #22 from Brian Vincent <brainn at gmail.com> ---
Created attachment 141863
  --> https://bugs.freedesktop.org/attachment.cgi?id=141863&action=edit
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.
 Over the weekend, I updated the firmware on the laptop itself, the dock, the
cable, everything.  I had to create a windows USB drive to update the firmware. 
 I've noticed no difference in behavior after the firmware upgrades.  I get the
same EDID.  Two of the firmwares that I updated were:

Synaptics VM3320 inside Dell WD15/TB16 wired dock
Summary: Multi-Stream Transport Device

Synaptics VM3330 inside Dell WD15/TB16 wired dock
Summary: Multi-Stream Transport Device

So I think it makes sense that you would see MST stuff for this laptop setup,
but you wouldn't see it on the amdgpu machine.

I also want to say that when I was booted up with Windows, it initially didn't
find the mode 4096x2160, but eventually after Windows did a bunch of hardware
discovery stuff, it was available.  I still have that USB drive if you would
like me to look at something in a Windows environment on the problematic i915
laptop/dock setup.

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