I'm trying to connect a brand new macbook Pro with 2 USB-C using an adapter with HDMI. The macbook detects the display, but the Connection Type is DisplayPort. Is there a way to change it? Screen displays the message "No HDMI signal detected"
Chipset Model: Intel Iris Plus Graphics 640
Type: GPU
Bus: Built-In
VRAM (Dynamic, Max): 1536 MB
Vendor: Intel
Device ID: 0x5926
Revision ID: 0x0006
Metal: Supported, feature set macOS GPUFamily2 v1
Displays:
Colour LCD:
Display Type: Built-In Retina LCD
Resolution: 2560x1600 Retina
Framebuffer Depth: 24-Bit Colour (ARGB8888)
Main Display: Yes
Mirror: Off
Online: Yes
Rotation: Supported
Automatically Adjust Brightness: No
DELL U2917W:
Resolution: 2560x1080 (UW-UXGA - Ultra Wide - Ultra Extended Graphics Array)
UI Looks like: 2560 x 1080 @ 60 Hz
Framebuffer Depth: 30-Bit Colour (ARGB2101010)
Display Serial Number: 749DX73N346L
Mirror: Off
Online: Yes
Rotation: Supported
Automatically Adjust Brightness: No
Connection Type: DisplayPort # I believe this is the problem.
Best Answer
The system is reporting that your Dell monitor is connected via DisplayPort be because you're actually connected to the DisplayPort port. That said, it's not what's causing the problem you're describing.
What you're doing is converting the signal from DisplayPort (DP) to HDMI and most likely using a passive adapter; what you need is an active adapter or better still, just go from DisplayPort to DisplayPort (that monitor supports it).
I describe this in further detail in these posts:
External monitors show blank screen until restart
MacBook Pro detects syncmaster (monitor) but doesn't display
USB-C to Displayport cable or adapter