4k@60Hz over LSPCON cannot drive the screen with pixel clock 533250. Works with pixel clock 594000.

SoC: CML, Intel(R) Xeon(R) W-10855M CPU @ 2.80GHz LSPCON vendor: Parade Tech

edid-decode:

First detailed timing is preferred timing
...
Detailed mode: Clock 533.250 MHz, 597 mm x 336 mm
               3840 3888 3920 4000 ( 48  32  80)
               2160 2163 2168 2222 (  3   5  54)
               +hsync -vsync
               VertFreq: 59.997 Hz, HorFreq: 133.312 kHz