kernel 5 i915 broken only on on Dell Precision 5530?

I got two machines - Thinkpad t470 and Precision 5530. Both running latest (0322) snapshots. While Thinkpad boots into latest 5.0.2 kernel just fine, Precision fails to boot. After setting debug flag during boot i could see system start booting until it reached “i915 0000:00:02.0: fb0: inteldrmfb frame buffer device”… and froze right there.
I would like to debug this, to make sensible bug report…but, when i’m booting system with i915 driver enabled system wont go past above message. Not even past where cryptsetup passing password question to plymouth…basically i do not have any logs in this case.
When i disable i915 driver system boots into runlevel 5 (or what they call nowadays multiuser target), but with failed display of course…unfortunately i really doubt that logs would be of any help here considering that all problems are attributed to disabled i915 driver.
If you have any ideas on how to debug this intelligently please let me know.

ah… just found this:
i guess i will continue my quest there.

Good find. Let us know how you get on.