Thinkvision Pro2840m flickering at 3840x2160 60Hz

I have just installed a Pro2840m display on a brand-new Dell T5810 workstation (with AMD W5100 graphics card), and the Pro2840 display flickers really badly when setting to the resolution recommended by Windows (3840x2160 @ 60Hz).
The flicker goes away if I reduce the refresh rate to 30Hz.
The monitor is running microcode TN3.01. Windows drivers are up to date (AMD 14.301.1010), and system is running Windows 8.1, with 8GB memory
Any ideas?

Hello and welcome to the Lenovo community. Out of experience I would suggest you connect only the (or one) Pro2840m to your W5100 using the supplied DP cable (by Lenovo) to test whether the fault is with the Lenovo. Obviously don't forget to be running the latest ISV certified drivers published for the particular software you are planning to use found here.
As a side note: I wonder when was your display purchased, because microcode LN3.01 was the very first version these displays were shipped with in June 2014. The latest version which I have heard of for the Pro2840m was at LN3.07 which has addressed a list of serious issues (see here or here for examples). Sadly firmwares for these displays are not released to public, for upgrading your firmware you will have to contact Lenovo support and request an RMA.
Don't forget to post back your findings so we all can benefit.

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Intel HD Graphics 4600 in processor only, or Intel HD Graphics 4600 in processor and NVIDIA GeForce GT 730M, PCI Express x8, 1GB memory, NVIDIA Optimus technology; supports external analog monitor via VGA and digital monitor via Mini DisplayPort; supports three independent displays; Max resolution: 1920x1200@60Hz (VGA); 3840x2160@60Hz (DP via mDP cable)
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The large print: please read the Community Participation Rules before posting. Include as much information as possible: model, machine type, operating system, and a descriptive subject line. Do not include personal information: serial number, telephone number, email address, etc. The fine print: I do not work for, nor do I speak for Lenovo. Unsolicited private messages will be ignored. ... GeezBlog
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Problems with 4K 60z in Mini DP

Hi~
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Hello Ni Forum,
I already searched for similar problems, but haven't found anything helpful. So I'm posting our problem here. I'm apologizing in advance for bad english, it's not my mother tongue
We're encountering some strange behaviour of our NI9411 Module. We're using it in a Compact Rio with some other modules (2x Analog In).
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The signals of the generator showed some peaks on each edge (rising and falling) with values for example of 11V above high impuls voltage of 9V (20V together). That may causes that wrong frequency measurement.
The signals of the flow sensors do not have such peaks, the LabView-frequency nevertheless does not match the real frequency, as shown below (all values in Hz):
LabView
ideal values
Flow Sensor 1
Flow Sensor 2
Flow Sensor 1
Flow Sensor 2
4600
12200
740,6
6760,0
6400
13500
1481,3
7500,7
9700
16400
2962,6
8982,0
12900
19500
4443,8
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Puls-Measure-VI is attached beneath.
Regards,
Johannes Rost
Attachments:
vi.png ‏20 KB

Dear Lynn,
thank you for your reply. The impedance was an issue that our local technical distributor already suggested to check. According to the datasheet of the flow sensor (see attachement) it can drive a current of 25mA. The signal generator we used is a test generator that can be used instead of the flow sensors to check the any evaluation unit the sensor is connected with. So it should generate signals that are equal to those the sensor would have generated. And even with this the frequencies measured with LabVIEW are not as expected.
We are in contact with the sensor manufacturer to exclude mistakes in connection on the sensor side. But the behavior with the signal generator makes us think that is has to do something with the characteristics of the NI9411 that we don't know yet.
Attachments:
block diagram signal amplifier and signal description.png ‏151 KB
technical data.png ‏124 KB

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GTX 970 Cards with HDMI 2.0
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did Format Fat (not Fat32)
copied the 2 files ?
replugged TV but nothing happens ? should I use USB 1 or 2 ? other ideas
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Had it working with the GTX 970 !!!
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Thinkvisio​n Pro2840m flickering at 3840x2160 60Hz

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Thinkvision Pro2840m flickering at 3840x2160 60Hz