Currently I am running ubuntu 14.04 and it works great with 3 monitors. When I plug in a 4th HP monitor that I have tested on a different computer I get an error
could not switch the monitor configuration crtc 116 That is when I have all 4 monitors plugged into my R9 390, I've updated my drivers and rebooted still with the same thing. I followed the answer here ERROR : could not set the configuration for CRTC 64 and it still is not working. Currently what I've done is kept the 3 working monitors in my r9 390 and plugged the 4th into my 750ti and installed the proprietary nvidia drivers, but the monitor still isn't detected. If I go into displays and click detect monitors the 4th is never detected. Here is the output of
lshw -c video
*-display description: VGA compatible controller product: Hawaii PRO [Radeon R9 290] vendor: Advanced Micro Devices, Inc. [AMD/ATI] physical id: 0 bus info: pci@0000:01:00.0 version: 80 width: 64 bits clock: 33MHz capabilities: pm pciexpress msi vga_controller bus_master cap_list rom configuration: driver=fglrx_pci latency=0 resources: irq:48 memory:e0000000-efffffff memory:f0000000-f07fffff ioport:e000(size=256) memory:f7200000-f723ffff memory:f7240000-f725ffff *-display UNCLAIMED description: VGA compatible controller product: GM107 [GeForce GTX 750 Ti] vendor: NVIDIA Corporation physical id: 0 bus info: pci@0000:02:00.0 version: a2 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress vga_controller cap_list configuration: latency=0 resources: memory:f6000000-f6ffffff memory:c0000000-cfffffff memory:d0000000-d1ffffff ioport:d000(size=128) memory:f7000000-f707ffff
I've searched the display unclaimed message for the 750ti, but everything I see there is about uninstall the fglrx drivers which I didn't think would fix it, but I tried anyway and I'm still getting the same thing. How can I set it up so all 4 monitors are connected? I would prefer to have them all run off the r9 390, but if that is not an option I can use the 750ti all I really care is that all are dtected. Thanks.
Edit: I should add the monitor works in the BIOS and I can see the Error crtc 116 message on the 4th monitor so I
know thought it's not a cabling issue.