Hey guys!
So I just got a 4K (AOC U2868PQU) screen at work (I'm a software developer), and I've been trying to get it setup on my PC. Running Linux Mint 17 with the 3.13.0-24-generic kernel.
Currently I'm running 2x AMD HD5570's and was running 4 screens, 3 off one and 1 off the other in this configuration:
$ lspci | grep VGA
02:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Redwood PRO [Radeon HD 5550/5570/5630/6510/6610/7570]
03:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Redwood PRO [Radeon HD 5550/5570/5630/6510/6610/7570]
First card:
- DVI 1920x1080
- HDMI 1600x1200
- DP 1920x1080
Second card:
- DVI 1920x1080
So that worked sweet using the open source drivers. So I get this 4K screen and set it up like so:
First card:
- DVI 1920x1080
- DP 3840x2160
Second card:
- DVI 1920x1080
- DP (->DVI) 1920x1080
But the open sources drivers don't support 4K, so the 4K screen was stuck at 1080i. So I installed the fglrx drivers and now I get 4K, but only two screens can be enabled (in arandr). I made the mistake of not installing the CCC however.
But it is SOOO LAGGY, on both the screens now. Is this a driver issue? Or a GPU issue? My boss said I can upgrade the video card (I'll prob stick with just 3 screens this time on a single card).
So if this is just a case of the 4K screen being too heavy for the little old 5570's, what graphics card should I get? I don't mind nVidia or AMD, just as long as I can drive 3 screens without having to wait for the mouse to come along.
Thanks for your help!
I'm going to go install the latest kernel, and re-install with CCC to see if I can get better performance (but I'm not hopeful).
UPDATE: OK installing 3.19.4 kernel, with the open source drivers got me 3 screens, but it's still laggy :(
UPDATE: Tried to re-install the fglrx driver but it won't compile against 3.19.4 :(
UPDATE: moved to Linux category as probably more suited here