8K display from an XPS 13 with Ubuntu

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I've tried a couple of docks, and cables, all for 8K.  It seems that in order to come out of the XPS 13 Iris Xe graphics as DisplayPort 8K that in a dock can be converted to HDMI 8K (65+ in TVs only have HDMI), in order to have low enough bandwidth, the GPU (in the CPU the Iris Xe) must apply Display Stream Compression (DSC) 1.2.

The hardware in an XPS 13 apparently can do Display Stream Compression (DSC) 1.2, in part witnessed by https://www.dell.com/support/kbdoc/en-us/000197102/how-to-enable-display-stream-compression-on-latitude-precision-and-xps .

How can we get that working in Ubuntu on an XPS 13?

My kernel sources have the related file drm_dsc.h.

That is what I know for now.

This computer model hardware with an i7-1195G7 can do it.  In October 2020 Intel Graphics Windows DCH Drivers version 27.20.100.8853 had in its release notes as fixed:  System unable to output 8K resolution with MTC/DSC docks such as Dell Thunderbolt dock (Iris Xe Graphics).  Fixed means then it is able to..