One last reply to document the issue(s) for others to find: Dell support, while responsive, has repeated replied with documents and references to the Dell WD22TB4 dock. I am led to believe through this and my testing (more on this later) that the Precision 7770 with the NVidia RTX A1000 -- and possibly other graphics cards -- is engineered to support only the connections available to that dock: 2x DisplayPort 1.4 and either of 1x HDMI or 1x Type-C. My testing with the 7770 and the Plugable TBT4-UDZ connected via TB4 to two 4K monitors: Terms: Discrete == Discrete Graphics Mode where the A1000 handles all monitors HGDO == Hybrid Graphics Mode with Direct Output - laptop display is on Intel graphics, external monitors on A1000 HG == Hybrid Graphics Mode - Both graphics cards are available, but all monitors generally run on the Intel graphics. Notes:
Apologies for the long story followed by the short question. Laptop: Precision 7770 i7-12850HX 32GB RAM NVidia RTX A1000 4GB Dock: Plugable TBT4-UDZ Monitors: LG 32UL950 (landscape), LG 27UL600 (portrait) both over HDMI Problem: running in Discrete Mode or Hybrid Mode with Direct Output won't let me set both monitors to 4K[NAME]. If I try to force it, one monitor (portrait one) goes black even though content is still rendering/running as seen on taskbar thumbnails. 60Hz and 30Hz paired works until I fire up videos from any source (news/review site, streaming services, etc). 30Hz and 30Hz does similar. Moving to one monitor on DisplayPort and the other on HDMI gets similar results. Switching to dual DisplayPort connections works fine with 4K[NAME] and all video content, but my desktop is currently plugged into the DP connections. Plain Hybrid Mode works fine all the way around both at 4K[NAME] and all video content works great. Only runs on Intel GPU though -- not a huge deal as a fallback. The short question: Is the A1000 GPU limited in some way or is this a Dell implementation that isn't working over Thunderbolt 4? Am I hitting some kind of memory or performance limit of the A1000 with the monitors I have and the landscape/portrait combo? Any assistance is appreciated.
Precision 7770 + NVidia RTX A1000 + dual HDMI 4K@60Hz