Dell Studio 1558 (Early 2010) - Manual (Page 327)

Ports
327
DisplayPort™
DisplayPort is a digital display interface standard put forth by the Video
Electronics Standards Association (VESA). It defines a new license-free,
royalty-free, digital audio/video interconnect, intended to be used primarily
between a computer and its display monitor, or a computer and a home-
theater system. For more information see "DisplayPort™ - Features and
Benefits" on page 56.
Pin Signal Pin Signal
1 ML_Lane 0(p) 11 GND
2 GND 12 ML_Lane 3(n)
3 ML_Lane 0(n) 13 GND
4 ML_Lane 1(p) 14 GND
5 GND 15 AUX_CH(p)
6 ML_Lane 1(n) 16 GND
7 ML_Lane 2(p) 17 AUX_CH(n)
8 GND 18 Hot Plug
9 ML_Lane 2(n) 19 DP_PWR Return
10 ML_Lane 3(p) 20 DP_PWR