I've connected my new HD monitor through VGA without any issues. When I connect the Notebook to the monitor using a DisplayPort to DisplayPort cable and set the monitor in DisplayPort mode no connection is established. My display adapters are DameWare Development Mirror Driver 64-bit and Radeon HD 6470M. The monitor is an ASUS VE278Q. Is there some setting on the Notebook that I need to activate DisplayPort? I'm assuming the cable connection should be sufficient for the monitor to recognize the Notebook. Any help is much appreciated!
I also have an Elitebook 8460p (AMD Radeon HD 6470M GPU), running Windows 7 (Enterprise), with an external HP 2511x LCD monitor, and *just* went through a simliar sceanrio as you did: I had problems getting a picture on my monitor when connected with an HDMI cable.
To clarify, I am actually using an Advanced Docking Station (230W) that has 2DVI & 2DisplayPort connections on the backside; I am using one of these DisplayPort connections with a DisplayPort dongle -> HDMI to connect my HDMI cable to the monitor. If you are connecting directly to your notebook's DP, this behavior *should* be the same...
First, let me start off with how i 'fixed' my issue (your milage may vary):
I'm still think this was a timing issue with me: The monitor and notebook both should be OFF; connect the cables; power up the notebook first but ensure the lid is CLOSED; THEN power up the monitor.
Having the newer drivers can't hurt; make sure you install them before connecting the external monitor.
CABLES CABLES CABLES! Always check the cabling and try a different HDMI cable if you have it.
Check that the connections themselve are nice and secure: In my case, the HDMI connection on the monitor was a bit sloppy (brand new monitor).
And just stick to it... (im also puzzled as to why this took so long..>I spent 4 to 5 hours until it worked<).
Now, let me detail who i got here:
My Connections: I had my system & monitor powered OFF, and after removing my DVI connector from my docking station and monitor, i connected my DisplayPort dongle to my dockign station, and connected the dongle to the Monitor using an HDMI cable. I powered-up my monitor & notebook (with notebook lid open in case I had to update drivers, enable something, etc).
Tried to enable the mointor: I Right-clicked on desktop to open the Control Panel/Display/'Screen resolution' UI, and performed a 'detect': nothing: it only showed the 'built-in monitor' for the notebook, and a generic monitor, but I didn't see my HP 2511 monitor. I did this several times, and finally, after trial and error the correct Monitor #2 (HP 2511) appeared as a second Monitor.
I tried to 'Extend desktop' to both monitors; but this only *partially* worked; I could see that the mointor was getting a signal becuase it came out of 'sleep' state (the power light went from amber to blue (active))...but there was no picture on the monitor(!)
Note: " Fixes an issue where the system does not detect external displays properly when the system is connected to a docking station with 2 external displays attached and the lid is closed on the system. "
Well, i said: nothing like new drivers...so i installed them.
However, even after having installed the drivers, No Pciture on the monitor...I could see that it was getting a signal (wasn't going to sleep), but not showing anything.
NOTE: I was doing this with my notebook lid open...
I then I checked the cabling; Brand new DisplayPort dongle...fairly new HDMI cable... so i reversed the HDMI cable, tried another cable...
Back to the 'Screen Resolution' UI, this time I made sure the desktop was NOT extended to Monitor #2 (the external monitor).
I Powered OFF the external Mointor (i could here the PnP event for the monitor).
I closed the notebook lid.
Rechecked ALL connections again (and again!!! they are finicky!!!!!).
I then Powered ON the external Monitor; I heard the PnP event for the monitor....and.... PICTURE!! The external mointor now had a picture.
Hope this helps...this is just from ME and not HP. 😉
Regards, HardCopy (I am employed by HP) [If this was helpful, please mark this 'Solved' or 'Accept as Solution' so others can find this too]