InferiorYeast Posted September 16, 2014 Share Posted September 16, 2014 I finally managed to get all three of my monitors working with my Radeon R9 280X (model ASUS-R9280X-DC2T-3GD5). Previously, using more than 2 monitors would result in my system freezing until I unplugged one of the outputs. After trying patched framebuffers and a variety of different port configurations I finally solved my problem! It turns out the solution was to switch to using the card in UEFI GOP mode. To accomplish this you need to be using Clover in UEFI mode (not CloverEFI), and your motherboard needs to be set so that the GPU runs in UEFI GOP mode. On my motherboard this meant disabling CSM. My system now runs great with all three monitors, either using GraphicsEnabler=No or GraphicsEnabler=Yes along with a patched framebuffer. This may also work for other AMD cards that exhibit similar behaviour when used with three monitors. Link to comment Share on other sites More sharing options...
vusun123 Posted September 17, 2014 Share Posted September 17, 2014 Cheers. This could be the reason why the R9-290X having problem with multiple monitors Link to comment Share on other sites More sharing options...
MattsCreative Posted September 18, 2014 Share Posted September 18, 2014 does not work for the 290x Link to comment Share on other sites More sharing options...
supraTT Posted September 27, 2014 Share Posted September 27, 2014 Could you detail how to set it up? I want to try it with my R9 270 with my dual monitor. Currently only one monitor work (@ 2560x1440) either via HDMI or DVID but not both as the same time. Link to comment Share on other sites More sharing options...
Pano_78 Posted November 22, 2015 Share Posted November 22, 2015 Did not work for me. Gigabyte z87m d3h Sapphire Vapor X 280x Link to comment Share on other sites More sharing options...
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