P2715Q, DP/mDP handshake problems?

Hi,

I had a similarly frustrating experience with my P2715Q connected to an Nvidia 970 graphics card on a generic i7 4770 H97 16GB build.  The main difference is I spent considerably more time than you and didn't succeed in getting the monitor to work again on dPort, so I plugged in an HDMI cable and have been using it at 30Hz for about a week.  During this time I reported to Dell that the monitor is faulty in some way and I am waiting an estimated 3 weeks to get a brand new replacement monitor.  In total I have spent a frustrating 3 hours dealing with various people at Dell, the latest dealing has Dell telling me that "my Dell personal computer" will be replaced as soon as they can ship one to me.  Huh?  the only Dell equipment that my wife and I own are 4 Dell monitors!

When I read your comment about pulling the power cable on the monitor, I decided I had to give it a try; that fixed it; thanks :).  I still have an issue though; I cannot get the monitor to be recognised in Windows 7 using the Dell Dport to mini-Dport cable at all, but I can get it to work using an HP Dport cable that a friend gave me.  As a minimum, I feel that there is a fault with my Dport to mini-Dport cable and that there is a bug in the monitor's handling of Dport detection in certain circumstances.

I think I will continue with the 3-week (or so) wait for a replacement monitor, in the hope that this Dport issue is some kind of fault that only occurs in certain units.  I also think that could benefit from obtaining a new Dport to mini-Dport cable, since my one was definitely flakey from the word-go (i.e. move it a bit and it drops connectivity) and I would like Dell to provide me with a (hopefully) reliable cable as well as a (hopefully) reliable replacement monitor.

Thanks again for sharing your experience.  It was a great help to me!

Groovejet6,

I have read several places on the forums where the Dell Dport to mini-Dport cable is definitely flaky. I have a good suspicion that this is probably the problem that I am having and quite possibly the same you are having especially since a different Dport cable does work and it "might" cause other problems with the monitor if it gets loose and crosses some of the terminals. If I continue to have problems I will attempt to get Dell to replace the cable with a standard Dport cable not the mini. Or I just might go ahead and get a Dport cable to save me the trouble.

Add the glitches I had with the monitor along with all the time and trouble it took me to setup my XPS8700 the way I wanted it and I was darned near ready to take it all out and chuck it in the nearest lake.

Don't rush out to buy a Displayport to Displayport cable; I had the same issue using my Dport to Dport cable less than 24 hours after I got the monitor working again on Dport after reading that the workaround is to pull the monitor's power plug and plug it back in.  I think I will still go ahead with exchanging mine and if the replacement has the same issue, I need to think carefully about whether I can live with the inconvenience of these random dropouts until there is hopefully clear confirmation that it has been fixed in later units, so that I can request a swap to one of those, or whether I will give up and ask for a refund.

I have the same cable issue. Unfortunately, no matter how many times I pulled out the cables, my 2715 still could not recognize the dp cable. :(  

Have to call DELL tmr and see if can get a replacement. Will also contact my company's IT desk and see if can borrow a DP 2 DP cable and test out. 

^same problem as above. I've got a brand new P2415Q. Using DP (monitor) to mDP (GTX 970) cable, does not give any image. Unplugging power cable doesn't work either. And since my GTX 970 model only has 3 mDP, don't have much to work with. Please update if anything works properly

I have the same issue except even if I pull the power the monitor won't come back I have to reboot the machine. It is really frustrating as this happened with my first one and the second one they sent to replace it because of tons of dead pixels. I have tried switching Display port cables (I am using full to full DP) but that did not work. 

Yup, DP issues with my P2425Q. I initiated my refund the moment I noticed them. This shouldn't come as any surprise to anyone - you play the early adopter game and purchase an A00 Dell monitor, and there will be bugs, that's the one thing you can always count on. 

Anyway, it has nothing to do with the Dell supplied DP->mDP cable. I verified the issue on that cable connected to the mDP port, and also with a known 'good' DP->DP cable on the DP port.

All,

Are these issues happening in prime mode 3840x2160 60Hz? Or are you in 3840x2160 30Hz? Or in some other resolution?

I was using 3840x2160 60Hz.

If you'e using a GTX900 series card, bear in mind that there was a known issue with those cards and DP. I believe it has been fixed in a recent driver. just make sure you're not running an old driver and confusing that issue with this Dell issue.

I'm using a GTX 780 Ti myself, and Windows 7 x64. Not that the latter really matters, because this issue can happen in POST/the BIOS before Windows is even in the equation.

For me, most of the time I experienced the issue it was cold booting the PC with the monitor in standby mode (LED flashing). The monitor would come on for a split second (never saw more than a black screen), then show it's no signal message and go back into standby. The PC had to be rebooted to regain a signal. It also happened once when I switched off the monitor while the PC was running; when I switched it back on there was no signal until reboot.

I know the GPU, it's DP connector and my DP cable are good. They were driving another 4K/60Hz monitor just fine before the P2415Q.

Aside from this issue, potential buyers should also note that this monitor acts like many other DP monitors and drops the DP handshake when switched off. This means that if you turn off the monitor while the PC is running, Windows will revert to a tiny 'safe' resolution, meaning your desktop icons/windows may be rearranged, and full screen applications like games may die. This also happens when you switch sources (eg. the DP handshake is lost if you switch to HDMI). I don't see why it's so difficult to find a hassle free DP implementation. This highly irritating behavior has been in DP monitors for years - not all of them, but by 2014 you'd have thought the likes of Dell would have figured it out long ago. 

Can you expand on "fiddled"?

Chris,

the first time it happened I was running 1920x1080/60hz. second and third time was 3840x2160/60hz.  haven't had any problems with it for almost 2 weeks now since I last fiddled with my power options.

I'm trying to get it to run at 4k at 60hz. Only gets image if I plug it into the motherboard's displayport (GIGABYTE GA-Z97X-GAMING GT,) nothing with the GTX 970. 

Haven't tried to update driver yet, might give that a go.

if I remember correctly I set darned near everything to stay on. I won't be home till this weekend (out of town for work) so I can't go over all the settings. I do remember that I have the monitor shut off or go into standby after 10 minutes and CPU set to 50% minimum. once I get home this weekend I will post all my settings and system specs.

i am using sapphire ati 7770 graphic card that comes with dvi, DP and HDMI port. Connect using DP port, seeing the LED power button on static white but screen not showing anything. Unplug the powercable doesn't resolve the issue for me. The monitor revision is 01. Currently the monitor displaying on HDMI at 4K resolution at 30hz only. Really dissapointed at this monitor. Previously using dell ultrasharp 19".

My P2715Q worked fine on displayport for three weeks and then quit altogether. Nothing will bring it back. I hooked up via HDMI and that only lasts seconds to minutes before the screen goes black and says there is no HDMI cable connected. If I power-off the monitor and then power-on, I get another seconds to minutes before the same thing. I initiated a return for replacement to Dell today.

FYI: When I connect my laptop to the P2715Q via HDMI at a low resolution, the monitor never goes black. I think this is a problem originating in the chipset in the monitor trying to display at 3840x2160, in either 30hz or 60hz.

I am running Windows 7 Professional with a NVIDIA GTX660.