Third screen resolution not properly recognized

asked 2017-03-11 05:05:09 -0500

Dikkehein gravatar image


I recently installed Fedora aside my Windows installation. All things going well, except for one thing. My third screen is not recognized properly. I have 2 screens from BENQ of the same type connected via DVI on 1920x1080 and a third monitor (Also BENQ but other type) connected via mini DP (with a mini DP to HDMI, because it does only have HDMI) but it only goes to 1024x768. Which should be 1920x1020. The video card i have is an AMD Radeon HD 7970. I tried installing the AMD drivers, no luck.

I tried adding a new mode to xrandr and set it for my screen. But when i try to use it i get the "xrandr: Configure crtc 0 failed" error.

Screen 0: minimum 320 x 200, current 4864 x 1080, maximum 8192 x 8192
XWAYLAND0 connected 1024x768+0+0 0mm x 0mm
     1024x768      59.92*+
XWAYLAND1 connected 1920x1080+1024+0 530mm x 300mm
     1920x1080     59.96*+
XWAYLAND2 connected 1920x1080+2944+0 530mm x 300mm
      1920x1080     59.96*+

cvt 1920 1080
# 1920x1080 59.96 Hz (CVT 2.07M9) hsync: 67.16 kHz; pclk: 173.00 MHz
Modeline "1920x1080_60.00"  173.00  1920 2048 2248 2576  1080 1083 1088 1120 -hsync +vsync

xrandr --newmode "1920x1080_60.00"  173.00  1920 2048 2248 2576  1080 1083 1088 1120 -hsync +vsync

xrandr --addmode XWAYLAND0 1920x1080_60.00

xrandr --output XWAYLAND0 --mode 1920x1080_60.00
xrandr: Configure crtc 0 failed

I also tried adding the existing modes from my other screens to this one. Same error.

lspci -nnk |grep -A 3 -i vga
01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Tahiti XT [Radeon HD 7970/8970 OEM / R9 280X] [1002:6798]
Subsystem: XFX Pine Group Inc. Device [1682:3212]
Kernel driver in use: radeon
Kernel modules: radeon

sudo dnf install xorg-x11-drv-amdgpu.x86_64

Nothing helped thus far. Is it because of the mini-DP to HDMI? I need to do it this way because the configuration guide of my card said the correct way to connect is to have 2 on DVI and a third (and fourth) on the mini display port. It works on windows correctly. As stubborn as i am, when i installed my third screen a while back, of course i tried connecting it directly on the HDMI. But that didnt work. I really needed to connect it on the mini DP.

Any help is appreciated! If i need to show more system diagnostics or specs, i am willing to provide them!


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