[Bug 112072] DisplayPort over USB-Type C Connector Not Recognised on Intel NUC8i5BEK (Gen 9, CoffeeLake)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=112072

Lakshmi <lakshminarayana.vudum at intel.com> changed:

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

--- Comment #2 from Lakshmi <lakshminarayana.vudum at intel.com> ---
(In reply to Geoffrey Allott from comment #0)
> I am running linux kernel 5.3.1 on an Intel NUC8i5BEK which has CoffeeLake
> graphics (Intel® Iris® Plus Graphics 655).
> 
> The device has two graphics output ports, 1 HDMI and 1 USB Type-C. The
> kernel reports 3 connectors; port A appears to be for embedded DisplayPort
> which is reported disconnected (there is a note "Haswell uses DDI functions
> to detect digital outputs. On SKL pre-D0 the strap isn't connected, so we
> assume it's there.").
>
Even though it's reported as disconnected, edp still working?

> I've connected an ASUS ROG PG278Q Monitor to the USB Type-C port using a
> Type-C to DisplayPort cable, but no video modes are reported except for the
> default VGA ones, meaning I'm stuck at a resolution of 1024x768. (The
> monitor supports 2560x1440 at 144). The video output does work, though.
>

Are there 2 issues in this bug? edp is not working and external display works
with only resolution 1024x768?

Can you attach display info cat /sys/kernel/debug/dri/0/i915_display_info ?

Can you verify the issue with drmtip (https://cgit.freedesktop.org/drm-tip)
with kernel parameters drm.debug=0x1e log_buf_len=4M.

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