radeon hd6850 graphics and acer xb280hk display. Driver problem?

Asked by Gabor Szabo

I have a XFX Ati Radeon HD 6850 card and dual display. One is an old LG flatron that works fine the other is Acer XB280HK 4K display. I can not make the resolution higher than 1024x768.
I tried to install radeon and fglrx driver but after both installation no display work any more.
I just installed 15.04 Ubuntu.

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Launchpad Janitor (janitor) said :
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