ok, I will downgrade kernel

sudo apt-get install --reinstall linux-image-3.13.0-39-generic 
linux-image-extra-3.13.0-39-generic
sudo update-grub
sudo reboot now

I have right now ATI Catalyst Drivers v.14.9.
Can you give me some advice what special should I search in my ATI drivers?

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https://bugs.launchpad.net/bugs/1104230

Title:
  DisplayPort 1.2 MST support is missing in the Intel driver

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