Screen flicker

[Bobsofa]

Hi everyone,

I really hope you can help me. I've been at this for hours upon hours, but I'm finally out of ideas.

First, to give it a little history:
I've used a Toshiba Dynadock U3, to minimize the hassle while using the notebook. Since this brick didn't work with any reliability while using the USB 3.0 connection, I got it refunded. Currently I'm using a USB 3.0 Hub with a USB 3.0 to HDMI adapter from Cablematters.

http://www.cablematters.com/pc-291-26-cable-matters-superspeed-usb-3020-to-hdmi-adapter-for-windows-and-mac-up-to-2048x11521920x1200.aspx

The occurring issues are:

1. Screen flickers, if usage is tried with a random window (Google Chrome, even Word)
2. 3D fullscreen applications, which are used on the primary monitor, (e.g. Games) crash/don't boot up (worked in previous driver versions)
3. Shutting down the system takes considerably longer
4. Booting up the system takes considerably longer

I've read and followed the HOWTO thread. All drivers are up to date I've used the Debug tool (all pass on system check), log file is attached. Hardware ID's are
USB\VID_17E9&PID_4301&REV_0297&MI_01 and USB\VID_17E9&PID_4301&REV_0297&MI_00.


System specs:

Samsung ATIV Book 8 870Z5E
CPU: Intel Core i7-3635QM
Chipset: Intel HM76
RAM: 16GB
GPU: AMD Radeon HD 8870M
Primary Display: Samsung 2494HM via AMD Radeon HD 8870M (HDMI)
Secondary Display: Samsung 2494HM via Displaylink Adapter
OS: Win 7 x64 SP1