U2415, Nvidia, lines distorted using DP/CDM, use Nvidia 344.11 or beta 344.80

Hello.
I just got a new U2415 (manufacturing date August 2014, revision A00).

Everything was fine with the monitor until I turned it off when I'm out.
When I turned on the screen back again the text was very distorted with lines on the screen. While in this state the screen every few seconds (can be 1 second or could be 10 seconds).

Restart the PC has the monitor works again until you turn it off and the same problem occurs. It is 100% reproducible.

The system that this is the case is a i7-860 with MSI P55-GD85, 16 GB of RAM and EVGA GTX750Ti.

This problem occurs with the RFP provided the MDP cable (DP on GPU, CDM on the monitor). I also tested with a DP to DP cable with a P2314H, I got and it also has the same problem.

The problem does NOT occur with HDMI or does it occur when place the monitor in DP1.2 However, when you use DP1.2 there is no display when turn the PC until it reaches windows so this isn't a solution, but a work around as it is kinda useless if you need to access the BIOS.
Also, the problem does NOT DP1.1 mode in the BIOS. The monitor can be turned and the end BIOS, this problem occurs only once windows loaded (I do not know if it occurs while windows is actually loading due to the wonders of SSD :))

I also tested the monitor on a second PC running an Intel DH77DF (H77 mini ITX board) with 8 GB of RAM and an i5 - 3470S using the on-board Intel HD2500 GPU. The problem does NOT occur on this UEFI/BIOS, Windows or Linux/Fedora 21 KDE system.

The used version of windows is Windows 7 Home Premium mini ITX/Intel GPU system and Windows 7 Ultimate on PC/nvidia GPU system.

Just for further testing, the failure occurs with DDC/CI enabled in mode standard and fast is enabled.

I also tested with the installed Dell Monitor driver and without, even twice.

I guess it sounds like the monitor and compatibility with nvidia hardware and/or drivers?

Is there a way to work around this problem, other than its use HDMI or DP 1.2?

Thank you

* edit *.
I also tested it in SafeMode on the machine of nvidia, where the problem does not occur with a direct start 21/KDE Fedora disc which was also good.
Even when you change the monitor in mode 5:4. Oddly enough, change the resolution in windows to something like 1600 x 1200 is not to reproduce the problem to set the monitor off, but do resolutions 16:10. (though in 1600 x 1200 sometimes distort the display but market still solve that).
I also took a few pictures to try to see the but I don't know if you can see a large part
Fig 1
Photo 2
Photo 3

rss81
Hello

I have exactly the same problem!  You never solved the problem?  Thank you

I have actually met a challenge!
It is indeed with drivers nvidia, somehow along the way to annoy I uninstalled all of the nvidia drivers and installed the latest Windows update which were 340.92... and all this has worked well.

Then I updated the driver quite up-to-date, which was 344.11... who also worked.
Upgrade to 344.75 brought the issue to haunt me again while I was using 344.11 until after hours of Googling around, I found...

This useful link

Beta drivers for 344.80 that lists the patches...

This is a beta driver that addresses the following questions:

  • GeForce GTX 980 poster texture shimmering when on high quality Texture filtering quality.
  • GPU output blurred lines on DisplayPort after a period of time following updated driver.
  • System hang up and black screen after work with some monitors (DP1.2 & 4 K / 60 Hz) + GTX980

Of course, that solved the problem.
If someone Dell reads this post, I saw a few other threads with people complaining of the same issue. Could you recommend people update for, at a minimum, this version of the driver? People are going to be blame Dell for the question when this is not the case. Thanks :)
(Now the only problem with my screen is slightly dark on the bottom but good)

Tags: Dell Peripherals

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