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Hello, I have plus E-Port on my E5450 and i have some problem with DP Connection. When i try to use DP on the e-port, monitor say display port no signal. In window 10, same HW config, dp out 4K @60Mhz on my asus monitor . ( i exclude cable problem) When i boot with lcd close, dp connected, i see boot screen at mojave statrtup but it never switch to graphical mojave login screen on my monitor. When i boot with lcd open, evry thing work but i have display port no signal on monitor I inspect ioreg entrys, on FB0 is use for ldc (monitor applebacklightdisplay), FB1 and FB2 type DP and monitor is reconize as appledisplay but allways no signal on monitor (with DP input on it), with this config, when i plug HDMI monitor work correcly. When i change connection it appear be correct in ioreg igpu framebuffer and monitor ( value change automaticaly when i change cable connector position on e-port. Has anybody idea how to find issue ? I have read a lot of page on the subject but i don't find the way to find solution ( probably due to knowledge for this subject ), I have update to last cover version but it's the same. I my config, everything work perfecly exept this point. Attached, Dump and ioreg In advance, thanks a lot for your help. debug_19326.zip ioreg.dump.ioreg