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I can connect the Macbook Air to the Dell monitor (P2314H) over VGA with a mini DisplayPort to VGA connector. I would like to get it working over DisplayPort though, as I've read that the picture quality will be better then (digital signal).

When I connect over DisplayPort, using a mini DisplayPort to DisplayPort connector, I see the Macbook screen blink, and the Dell monitor thinks there's something going on too, but not a signal that it can understand. Below is the console log from my computer the moment I connect the two over DisplayPort.

EDIT: I see the monitor (Dell P2314H) uses DisplayPort 1.2a, whereas the Macbook Air only uses DisplayPort 1.1 -- could that be the cause?

Console log:

13/10/14 20:48:02,101 WindowServer[96]: Received display connect changed for display 0x42737c0
13/10/14 20:48:02,103 WindowServer[96]: Found 16 modes for display 0x042737c0 [16, 0]
13/10/14 20:48:02,120 WindowServer[96]: Received display connect changed for display 0x3f003d
13/10/14 20:48:02,120 WindowServer[96]: Found 1 modes for display 0x003f003d [1, 0]
13/10/14 20:48:02,120 WindowServer[96]: Received display connect changed for display 0x3f003e
13/10/14 20:48:02,120 WindowServer[96]: Found 1 modes for display 0x003f003e [1, 0]
13/10/14 20:48:02,147 WindowServer[96]: Display 0x042737c0: GL mask 0x1; bounds (0, 0)[1440 x 900], 16 modes available
Main, Active, on-line, enabled, built-in, boot, OpenGL-accel, Vendor 610, Model 9cdf, S/N 0, Unit 0, Rotation 0
UUID 0xea8876a9951cb458a16805bc015c42a8, ColorProfile { 2, "Color LCD"}
13/10/14 20:48:02,147 WindowServer[96]: GLCompositor: GL renderer id 0x01024500, GL mask 0x0000000f, accelerator 0x00003587, unit 0, caps QEX|MIPMAP, vram 1536 MB
texture max 16384, viewport max {16384, 16384}, extensions FPRG|NPOT|GLSL|FLOAT
13/10/14 20:48:02,147 WindowServer[96]: Display 0x003f003f: GL mask 0x8; bounds (2464, 0)[1 x 1], 2 modes available
off-line, enabled, OpenGL-accel, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 3, Rotation 0
UUID 0xffffffffffffffffffffffffffffffff
13/10/14 20:48:02,148 WindowServer[96]: GLCompositor: GL renderer id 0x01024500, GL mask 0x0000000f, accelerator 0x00003587, unit 0, caps QEX|MIPMAP, vram 1536 MB
texture max 16384, viewport max {16384, 16384}, extensions FPRG|NPOT|GLSL|FLOAT
13/10/14 20:48:02,148 WindowServer[96]: Display 0x003f003e: GL mask 0x4; bounds (2465, 0)[1 x 1], 1 modes available
off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 2, Rotation 0
UUID 0xffffffffffffffffffffffffffffffff
13/10/14 20:48:02,148 WindowServer[96]: Display 0x003f003d: GL mask 0x2; bounds (2466, 0)[1 x 1], 1 modes available
off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 1, Rotation 0
UUID 0xffffffffffffffffffffffffffffffff
13/10/14 20:48:02,151 WindowServer[96]: Display 0x042737c0: Unit 0: Startup Mode 1440 x 900, CGSThirtytwoBitColor, Resolution 1, ioModeID 0x80002000, ioModeDepth 0x0, IOReturn 0x0
13/10/14 20:48:02,152 WindowServer[96]: Display added
13/10/14 20:48:02,152 WindowServer[96]: Display removed
13/10/14 20:48:02,153 WindowServer[96]: Display 0x042737c0: GL mask 0x1; bounds (0, 0)[1440 x 900], 16 modes available
Main, Active, on-line, enabled, built-in, boot, OpenGL-accel, Vendor 610, Model 9cdf, S/N 0, Unit 0, Rotation 0
UUID 0xea8876a9951cb458a16805bc015c42a8, ColorProfile { 2, "Color LCD"}
13/10/14 20:48:02,153 WindowServer[96]: GLCompositor: GL renderer id 0x01024500, GL mask 0x0000000f, accelerator 0x00003587, unit 0, caps QEX|MIPMAP, vram 1536 MB
texture max 16384, viewport max {16384, 16384}, extensions FPRG|NPOT|GLSL|FLOAT
13/10/14 20:48:02,153 WindowServer[96]: Display 0x003f003f: GL mask 0x8; bounds (2464, 0)[1 x 1], 2 modes available
off-line, enabled, OpenGL-accel, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 3, Rotation 0
UUID 0xffffffffffffffffffffffffffffffff
13/10/14 20:48:02,153 WindowServer[96]: GLCompositor: GL renderer id 0x01024500, GL mask 0x0000000f, accelerator 0x00003587, unit 0, caps QEX|MIPMAP, vram 1536 MB
texture max 16384, viewport max {16384, 16384}, extensions FPRG|NPOT|GLSL|FLOAT
13/10/14 20:48:02,153 WindowServer[96]: Display 0x003f003e: GL mask 0x4; bounds (2465, 0)[1 x 1], 1 modes available
off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 2, Rotation 0
UUID 0xffffffffffffffffffffffffffffffff
13/10/14 20:48:02,153 WindowServer[96]: Display 0x003f003d: GL mask 0x2; bounds (2466, 0)[1 x 1], 1 modes available
off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 1, Rotation 0
UUID 0xffffffffffffffffffffffffffffffff
13/10/14 20:48:02,184 WindowServer[96]: MPAccessSurfaceForDisplayDevice: Set up page flip mode on display 0x042737c0 device: 0x7fb9da407fb0  isBackBuffered: 1 numComp: 3 numDisp: 3
13/10/14 20:48:02,000 kernel[0]: USB (XHCI Root Hub USB 2.0 Simulation):Port 1 on bus 0xa connected or disconnected: portSC(0xe0206e1)
13/10/14 20:48:03,822 WindowServer[96]: Received display connect changed for display 0x42737c0
13/10/14 20:48:03,823 WindowServer[96]: Found 16 modes for display 0x042737c0 [16, 0]
13/10/14 20:48:03,840 WindowServer[96]: Received display connect changed for display 0x3f003d
13/10/14 20:48:03,840 WindowServer[96]: Found 1 modes for display 0x003f003d [1, 0]
13/10/14 20:48:03,840 WindowServer[96]: Received display connect changed for display 0x3f003e
13/10/14 20:48:03,841 WindowServer[96]: Found 1 modes for display 0x003f003e [1, 0]
13/10/14 20:48:03,924 WindowServer[96]: Display 0x042737c0: GL mask 0x1; bounds (0, 0)[1440 x 900], 16 modes available
Main, Active, on-line, enabled, built-in, boot, OpenGL-accel, Vendor 610, Model 9cdf, S/N 0, Unit 0, Rotation 0
UUID 0xea8876a9951cb458a16805bc015c42a8, ColorProfile { 2, "Color LCD"}
13/10/14 20:48:03,925 WindowServer[96]: GLCompositor: GL renderer id 0x01024500, GL mask 0x0000000f, accelerator 0x00003587, unit 0, caps QEX|MIPMAP, vram 1536 MB
texture max 16384, viewport max {16384, 16384}, extensions FPRG|NPOT|GLSL|FLOAT
13/10/14 20:48:03,925 WindowServer[96]: Display 0x003f003f: GL mask 0x8; bounds (2464, 0)[1 x 1], 2 modes available
off-line, enabled, OpenGL-accel, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 3, Rotation 0
UUID 0xffffffffffffffffffffffffffffffff
13/10/14 20:48:03,925 WindowServer[96]: GLCompositor: GL renderer id 0x01024500, GL mask 0x0000000f, accelerator 0x00003587, unit 0, caps QEX|MIPMAP, vram 1536 MB
texture max 16384, viewport max {16384, 16384}, extensions FPRG|NPOT|GLSL|FLOAT
13/10/14 20:48:03,925 WindowServer[96]: Display 0x003f003e: GL mask 0x4; bounds (2465, 0)[1 x 1], 1 modes available
off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 2, Rotation 0
UUID 0xffffffffffffffffffffffffffffffff
13/10/14 20:48:03,925 WindowServer[96]: Display 0x003f003d: GL mask 0x2; bounds (2466, 0)[1 x 1], 1 modes available
off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 1, Rotation 0
UUID 0xffffffffffffffffffffffffffffffff
13/10/14 20:48:04,121 WindowServer[96]: **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'.
13/10/14 20:48:04,136 WindowServer[96]: Display 0x042737c0: Unit 0: Startup Mode 1440 x 900, CGSThirtytwoBitColor, Resolution 1, ioModeID 0x80004000, ioModeDepth 0x0, IOReturn 0x0
13/10/14 20:48:04,137 WindowServer[96]: Display added
13/10/14 20:48:04,137 WindowServer[96]: Display removed
13/10/14 20:48:04,138 WindowServer[96]: Display 0x042737c0: GL mask 0x1; bounds (0, 0)[1440 x 900], 16 modes available
Main, Active, on-line, enabled, built-in, boot, OpenGL-accel, Vendor 610, Model 9cdf, S/N 0, Unit 0, Rotation 0
UUID 0xea8876a9951cb458a16805bc015c42a8, ColorProfile { 2, "Color LCD"}
13/10/14 20:48:04,138 WindowServer[96]: GLCompositor: GL renderer id 0x01024500, GL mask 0x0000000f, accelerator 0x00003587, unit 0, caps QEX|MIPMAP, vram 1536 MB
texture max 16384, viewport max {16384, 16384}, extensions FPRG|NPOT|GLSL|FLOAT
13/10/14 20:48:04,138 WindowServer[96]: Display 0x003f003f: GL mask 0x8; bounds (2464, 0)[1 x 1], 2 modes available
off-line, enabled, OpenGL-accel, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 3, Rotation 0
UUID 0xffffffffffffffffffffffffffffffff
13/10/14 20:48:04,138 WindowServer[96]: GLCompositor: GL renderer id 0x01024500, GL mask 0x0000000f, accelerator 0x00003587, unit 0, caps QEX|MIPMAP, vram 1536 MB
texture max 16384, viewport max {16384, 16384}, extensions FPRG|NPOT|GLSL|FLOAT
13/10/14 20:48:04,138 WindowServer[96]: Display 0x003f003e: GL mask 0x4; bounds (2465, 0)[1 x 1], 1 modes available
off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 2, Rotation 0
UUID 0xffffffffffffffffffffffffffffffff
13/10/14 20:48:04,138 WindowServer[96]: Display 0x003f003d: GL mask 0x2; bounds (2466, 0)[1 x 1], 1 modes available
off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 1, Rotation 0
UUID 0xffffffffffffffffffffffffffffffff
13/10/14 20:48:04,152 WindowServer[96]: **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'.
13/10/14 20:48:04,173 WindowServer[96]: MPAccessSurfaceForDisplayDevice: Set up page flip mode on display 0x042737c0 device: 0x7fb9da407fb0  isBackBuffered: 1 numComp: 3 numDisp: 3
13/10/14 20:48:04,231 WindowServer[96]: Display 0x042737c0: Unit 0; ColorProfile { 2, "Color LCD"}; TransferTable (256, 12)
13/10/14 20:48:04,286 WindowServer[96]: Display 0x042737c0: Unit 0; ColorProfile { 2, "Color LCD"}; TransferTable (256, 12)
13/10/14 20:48:04,301 WindowServer[96]: Display 0x042737c0: Unit 0; ColorProfile { 2, "Color LCD"}; TransferTable (256, 12)
13/10/14 20:48:04,405 WindowServer[96]: Display 0x042737c0: Unit 0; ColorProfile { 2, "Color LCD"}; TransferTable (256, 12)
13/10/14 20:48:05,841 WindowServer[96]: **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'.
13/10/14 20:48:05,878 WindowServer[96]: Display 0x042737c0: Unit 0; ColorProfile { 2, "Color LCD"}; TransferTable (256, 12)
13/10/14 20:48:05,908 WindowServer[96]: Display 0x042737c0: Unit 0; ColorProfile { 2, "Color LCD"}; TransferTable (256, 12)
13/10/14 20:48:06,137 WindowServer[96]: **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'.
13/10/14 20:48:06,176 WindowServer[96]: Display 0x042737c0: Unit 0; ColorProfile { 2, "Color LCD"}; TransferTable (256, 12)
13/10/14 20:48:06,191 WindowServer[96]: Display 0x042737c0: Unit 0; ColorProfile { 2, "Color LCD"}; TransferTable (256, 12)
  • It is trying to run it in a non supported resolution mode. Turn off your video card and try again, if successful turn on the video card and select the supported resolution. – Ruskes Oct 13 '14 at 19:19
  • Could you tell us about the make/model of your "mini DisplayPort to VGA connector" – Ruskes Oct 13 '14 at 19:48
-2

Open Display under System Preferences.

Click Gather Windows. That will allow you to see the display settings for the Dell Monitor.

On the "Dell Monitor" display window, Chose Scaled and try a different resolution.

  • There's no "Gather Windows" button. – Eoin Dubsky Oct 14 '14 at 7:06

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