Here is the output from xrandr --verbose with my two screens connected.
HDMI-1 is the screen thats always black, and HDMI-2 is working.
xrandr --verbose
Screen 0: minimum 320 x 200, current 4480 x 1440, maximum 16384 x 16384
HDMI-1 connected primary 1920x1080+2560+0 (0x49) normal (normal left inverted right x axis y axis) 477mm x 268mm
Identifier: 0x42
Timestamp: 373031
Subpixel: unknown
Gamma: 1.0:1.0:1.0
Brightness: 1.0
Clones:
CRTC: 0
CRTCs: 0
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
EDID:
00ffffffffffff0009d15f7845540000
2f13010380351d782e6085a6564a9c25
125054a56b80710081c081408180a9c0
b300d1c00101023a801871382d40582c
4500dd0c1100001e000000ff00414239
3037373132534c303030000000fd0032
4c185311000a202020202020000000fc
0047323432304844424c0a0a0a0a00e5
hue: 50
range: (0, 100)
saturation: 50
range: (0, 100)
contrast: 50
range: (0, 100)
brightness: 50
range: (0, 100)
Colorspace: Default
supported: Default, SMPTE_170M_YCC, BT709_YCC, XVYCC_601, XVYCC_709, SYCC_601, opYCC_601, opRGB, BT2020_CYCC, BT2020_RGB, BT2020_YCC, DCI-P3_RGB_D65, DCI-P3_RGB_Theater
output_type_capacity: DVI
supported: DVI, HDMI
output_hdmi_dvi: auto
supported: auto, force_hdmi, force_dvi
allm_enable: disable
supported: disable, enable
allm_capacity: 0
range: (0, 1)
USER_SPLIT_MODE: 0
range: (0, 1)
color_format_caps: 1
range: (0, 15)
color_depth_caps: 1
range: (0, 255)
color_format: ycbcr444
supported: rgb, ycbcr444, ycbcr422, ycbcr420, ycbcr_high_subsampling, ycbcr_low_subsampling, invalid_output
color_depth: 24bit
supported: Automatic, 24bit, 30bit
link-status: Good
supported: Good, Bad
CONNECTOR_ID: 197
supported: 197
non-desktop: 0
range: (0, 1)
1920x1080 (0x49) 148.500MHz +HSync +VSync *current +preferred
h: width 1920 start 2008 end 2052 total 2200 skew 0 clock 67.50KHz
v: height 1080 start 1084 end 1089 total 1125 clock 60.00Hz
1680x1050 (0x556) 119.000MHz +HSync -VSync
h: width 1680 start 1728 end 1760 total 1840 skew 0 clock 64.67KHz
v: height 1050 start 1053 end 1059 total 1080 clock 59.88Hz
1600x900 (0x557) 108.000MHz +HSync +VSync
h: width 1600 start 1624 end 1704 total 1800 skew 0 clock 60.00KHz
v: height 900 start 901 end 904 total 1000 clock 60.00Hz
1280x1024 (0x50) 135.000MHz +HSync +VSync
h: width 1280 start 1296 end 1440 total 1688 skew 0 clock 79.98KHz
v: height 1024 start 1025 end 1028 total 1066 clock 75.02Hz
1280x1024 (0x51) 108.000MHz +HSync +VSync
h: width 1280 start 1328 end 1440 total 1688 skew 0 clock 63.98KHz
v: height 1024 start 1025 end 1028 total 1066 clock 60.02Hz
1280x960 (0x558) 108.000MHz +HSync +VSync
h: width 1280 start 1376 end 1488 total 1800 skew 0 clock 60.00KHz
v: height 960 start 961 end 964 total 1000 clock 60.00Hz
1152x864 (0x52) 108.000MHz +HSync +VSync
h: width 1152 start 1216 end 1344 total 1600 skew 0 clock 67.50KHz
v: height 864 start 865 end 868 total 900 clock 75.00Hz
1280x720 (0x53) 74.250MHz +HSync +VSync
h: width 1280 start 1390 end 1430 total 1650 skew 0 clock 45.00KHz
v: height 720 start 725 end 730 total 750 clock 60.00Hz
1024x768 (0x56) 78.750MHz +HSync +VSync
h: width 1024 start 1040 end 1136 total 1312 skew 0 clock 60.02KHz
v: height 768 start 769 end 772 total 800 clock 75.03Hz
1024x768 (0x57) 65.000MHz -HSync -VSync
h: width 1024 start 1048 end 1184 total 1344 skew 0 clock 48.36KHz
v: height 768 start 771 end 777 total 806 clock 60.00Hz
832x624 (0x559) 57.284MHz -HSync -VSync
h: width 832 start 864 end 928 total 1152 skew 0 clock 49.73KHz
v: height 624 start 625 end 628 total 667 clock 74.55Hz
800x600 (0x58) 49.500MHz +HSync +VSync
h: width 800 start 816 end 896 total 1056 skew 0 clock 46.88KHz
v: height 600 start 601 end 604 total 625 clock 75.00Hz
800x600 (0x59) 40.000MHz +HSync +VSync
h: width 800 start 840 end 968 total 1056 skew 0 clock 37.88KHz
v: height 600 start 601 end 605 total 628 clock 60.32Hz
640x480 (0x60) 31.500MHz -HSync -VSync
h: width 640 start 656 end 720 total 840 skew 0 clock 37.50KHz
v: height 480 start 481 end 484 total 500 clock 75.00Hz
640x480 (0x62) 25.175MHz -HSync -VSync
h: width 640 start 656 end 752 total 800 skew 0 clock 31.47KHz
v: height 480 start 490 end 492 total 525 clock 59.94Hz
720x400 (0x63) 28.320MHz -HSync +VSync
h: width 720 start 738 end 846 total 900 skew 0 clock 31.47KHz
v: height 400 start 412 end 414 total 449 clock 70.08Hz
HDMI-2 connected 2560x1440+0+0 (0x46) normal (normal left inverted right x axis y axis) 597mm x 336mm
Identifier: 0x43
Timestamp: 373031
Subpixel: unknown
Gamma: 1.0:1.0:1.0
Brightness: 1.0
Clones:
CRTC: 1
CRTCs: 1
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
EDID:
00ffffffffffff0010ac2f4255504742
0c200103803c2278eeee95a3544c9926
0f5054a54b00714f8180a940d1c00101
010101010101565e00a0a0a029503020
350055502100001a000000ff00465153
4c3848330a2020202020000000fc0044
454c4c205532373232440a20000000fd
00314c1e5a19000a2020202020200125
020324f14f9005040302071601061112
1513141f23097f078301000067030c00
1000383c023a801871382d40582c4500
55502100001e7e3900a080381f403020
3a0055502100001a011d007251d01e20
6e28550055502100001ebf1600a08038
134030203a0055502100001a00000000
00000000000000000000000000000010
hue: 50
range: (0, 100)
saturation: 50
range: (0, 100)
contrast: 50
range: (0, 100)
brightness: 50
range: (0, 100)
Colorspace: Default
supported: Default, SMPTE_170M_YCC, BT709_YCC, XVYCC_601, XVYCC_709, SYCC_601, opYCC_601, opRGB, BT2020_CYCC, BT2020_RGB, BT2020_YCC, DCI-P3_RGB_D65, DCI-P3_RGB_Theater
output_type_capacity: HDMI
supported: DVI, HDMI
output_hdmi_dvi: auto
supported: auto, force_hdmi, force_dvi
allm_enable: disable
supported: disable, enable
allm_capacity: 0
range: (0, 1)
USER_SPLIT_MODE: 0
range: (0, 1)
color_format_caps: 7
range: (0, 15)
color_depth_caps: 7
range: (0, 255)
color_format: ycbcr444
supported: rgb, ycbcr444, ycbcr422, ycbcr420, ycbcr_high_subsampling, ycbcr_low_subsampling, invalid_output
color_depth: 24bit
supported: Automatic, 24bit, 30bit
link-status: Good
supported: Good, Bad
CONNECTOR_ID: 211
supported: 211
non-desktop: 0
range: (0, 1)
2560x1440 (0x46) 241.500MHz +HSync -VSync *current +preferred
h: width 2560 start 2608 end 2640 total 2720 skew 0 clock 88.79KHz
v: height 1440 start 1443 end 1448 total 1481 clock 59.95Hz
2048x1080 (0x47) 147.180MHz +HSync -VSync
h: width 2048 start 2096 end 2128 total 2208 skew 0 clock 66.66KHz
v: height 1080 start 1083 end 1093 total 1111 clock 60.00Hz
2048x1080 (0x48) 58.230MHz +HSync -VSync
h: width 2048 start 2096 end 2128 total 2208 skew 0 clock 26.37KHz
v: height 1080 start 1083 end 1093 total 1099 clock 24.00Hz
1920x1080 (0x49) 148.500MHz +HSync +VSync
h: width 1920 start 2008 end 2052 total 2200 skew 0 clock 67.50KHz
v: height 1080 start 1084 end 1089 total 1125 clock 60.00Hz
1920x1080 (0x4a) 148.500MHz +HSync +VSync
h: width 1920 start 2448 end 2492 total 2640 skew 0 clock 56.25KHz
v: height 1080 start 1084 end 1089 total 1125 clock 50.00Hz
1920x1080 (0x4b) 148.352MHz +HSync +VSync
h: width 1920 start 2008 end 2052 total 2200 skew 0 clock 67.43KHz
v: height 1080 start 1084 end 1089 total 1125 clock 59.94Hz
1920x1080i (0x4c) 74.250MHz +HSync +VSync Interlace
h: width 1920 start 2008 end 2052 total 2200 skew 0 clock 33.75KHz
v: height 1080 start 1084 end 1094 total 1125 clock 60.00Hz
1920x1080i (0x4d) 74.250MHz +HSync +VSync Interlace
h: width 1920 start 2448 end 2492 total 2640 skew 0 clock 28.12KHz
v: height 1080 start 1084 end 1094 total 1125 clock 50.00Hz
1920x1080i (0x4e) 74.176MHz +HSync +VSync Interlace
h: width 1920 start 2008 end 2052 total 2200 skew 0 clock 33.72KHz
v: height 1080 start 1084 end 1094 total 1125 clock 59.94Hz
1600x1200 (0x4f) 162.000MHz +HSync +VSync
h: width 1600 start 1664 end 1856 total 2160 skew 0 clock 75.00KHz
v: height 1200 start 1201 end 1204 total 1250 clock 60.00Hz
1280x1024 (0x50) 135.000MHz +HSync +VSync
h: width 1280 start 1296 end 1440 total 1688 skew 0 clock 79.98KHz
v: height 1024 start 1025 end 1028 total 1066 clock 75.02Hz
1280x1024 (0x51) 108.000MHz +HSync +VSync
h: width 1280 start 1328 end 1440 total 1688 skew 0 clock 63.98KHz
v: height 1024 start 1025 end 1028 total 1066 clock 60.02Hz
1152x864 (0x52) 108.000MHz +HSync +VSync
h: width 1152 start 1216 end 1344 total 1600 skew 0 clock 67.50KHz
v: height 864 start 865 end 868 total 900 clock 75.00Hz
1280x720 (0x53) 74.250MHz +HSync +VSync
h: width 1280 start 1390 end 1430 total 1650 skew 0 clock 45.00KHz
v: height 720 start 725 end 730 total 750 clock 60.00Hz
1280x720 (0x54) 74.250MHz +HSync +VSync
h: width 1280 start 1720 end 1760 total 1980 skew 0 clock 37.50KHz
v: height 720 start 725 end 730 total 750 clock 50.00Hz
1280x720 (0x55) 74.176MHz +HSync +VSync
h: width 1280 start 1390 end 1430 total 1650 skew 0 clock 44.96KHz
v: height 720 start 725 end 730 total 750 clock 59.94Hz
1024x768 (0x56) 78.750MHz +HSync +VSync
h: width 1024 start 1040 end 1136 total 1312 skew 0 clock 60.02KHz
v: height 768 start 769 end 772 total 800 clock 75.03Hz
1024x768 (0x57) 65.000MHz -HSync -VSync
h: width 1024 start 1048 end 1184 total 1344 skew 0 clock 48.36KHz
v: height 768 start 771 end 777 total 806 clock 60.00Hz
800x600 (0x58) 49.500MHz +HSync +VSync
h: width 800 start 816 end 896 total 1056 skew 0 clock 46.88KHz
v: height 600 start 601 end 604 total 625 clock 75.00Hz
800x600 (0x59) 40.000MHz +HSync +VSync
h: width 800 start 840 end 968 total 1056 skew 0 clock 37.88KHz
v: height 600 start 601 end 605 total 628 clock 60.32Hz
720x576 (0x5a) 27.000MHz -HSync -VSync
h: width 720 start 732 end 796 total 864 skew 0 clock 31.25KHz
v: height 576 start 581 end 586 total 625 clock 50.00Hz
720x576i (0x5b) 13.500MHz -HSync -VSync Interlace
h: width 720 start 732 end 795 total 864 skew 0 clock 15.62KHz
v: height 576 start 580 end 586 total 625 clock 50.00Hz
720x480 (0x5c) 27.027MHz -HSync -VSync
h: width 720 start 736 end 798 total 858 skew 0 clock 31.50KHz
v: height 480 start 489 end 495 total 525 clock 60.00Hz
720x480 (0x5d) 27.000MHz -HSync -VSync
h: width 720 start 736 end 798 total 858 skew 0 clock 31.47KHz
v: height 480 start 489 end 495 total 525 clock 59.94Hz
720x480i (0x5e) 13.514MHz -HSync -VSync Interlace
h: width 720 start 739 end 801 total 858 skew 0 clock 15.75KHz
v: height 480 start 488 end 494 total 525 clock 60.00Hz
720x480i (0x5f) 13.500MHz -HSync -VSync Interlace
h: width 720 start 739 end 801 total 858 skew 0 clock 15.73KHz
v: height 480 start 488 end 494 total 525 clock 59.94Hz
640x480 (0x60) 31.500MHz -HSync -VSync
h: width 640 start 656 end 720 total 840 skew 0 clock 37.50KHz
v: height 480 start 481 end 484 total 500 clock 75.00Hz
640x480 (0x61) 25.200MHz -HSync -VSync
h: width 640 start 656 end 752 total 800 skew 0 clock 31.50KHz
v: height 480 start 490 end 492 total 525 clock 60.00Hz
640x480 (0x62) 25.175MHz -HSync -VSync
h: width 640 start 656 end 752 total 800 skew 0 clock 31.47KHz
v: height 480 start 490 end 492 total 525 clock 59.94Hz
720x400 (0x63) 28.320MHz -HSync +VSync
h: width 720 start 738 end 846 total 900 skew 0 clock 31.47KHz
v: height 400 start 412 end 414 total 449 clock 70.08Hz
DP-1 disconnected (normal left inverted right x axis y axis)
Identifier: 0x44
Timestamp: 373031
Subpixel: unknown
Clones:
CRTCs: 2
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
hue: 50
range: (0, 100)
saturation: 50
range: (0, 100)
contrast: 50
range: (0, 100)
brightness: 50
range: (0, 100)
color_format_caps: 0
range: (0, 64)
color_depth_caps: 1
range: (0, 256)
color_format: rgb
supported: rgb, ycbcr444, ycbcr422, ycbcr420
color_depth: Automatic
supported: Automatic, 18bit, 24bit, 30bit
link-status: Good
supported: Good, Bad
CONNECTOR_ID: 225
supported: 225
non-desktop: 0
range: (0, 1)