On Mon, Sep 17, 2012 at 6:16 PM, Takashi Iwai <tiwai at suse.de> wrote: > Hi Adam, > > At Fri, 14 Sep 2012 11:25:03 -0400, > Adam Jackson wrote: >> >> On 9/14/12 10:19 AM, Takashi Iwai wrote: >> > Hi, >> > >> > we've got a machine showing a ghost DP2 output on a docking station. >> > The docking station has only one DP port and it's connected to DP1. >> > As a result, we get an DP2 active output containing the bogus VESA >> > standard modes 1024x768, 800x600, 640x480 although it's not connected >> > at all. >> > >> > Looking a bit deeply on it, it seems that the connector gives actually >> > the valid DPCD. So intel_dp_detect() returns >> > connector_status_connected. But since there is no real connection, >> > EDID isn't obtained. Thus of course no valid modes set. >> >> Can you be more specific here? What DPCD does it return? > > It shows "DPCD: 110a820100030181" I don't see how it can be a floating port if something is answering DPCD, or how it could be a hardware problem. Like it doesn't seem likely they terminated the port with a special DP chip. Though you'd have to decode the DPCD to see what it is. Dave.
