I'm using Asus TUF A15 laptop with Ubuntu 21.04 installed (Ryzen 5800 / RTX 3060)
My usual setup is made from 2 screens - laptop's internal (144hz/1080p), and external monitor connected over DisplayPort (144hz/1444p).
Today I dusted off an old monitor which I planned to use as third screen (60hz/1080p), over standard HDMI albeit after connecting I encountered a problem.
For some reason I can use only two screens in any combination (Internal/DP, Internal/HDMI, HDMI/DP) while third one stays black.
Both Ubuntu settings and Nvidia X Server Settings detect all 3 screens, I can change their setup, even move cursor around the blank one, just the display is missing.
Is there something I can do?
xrandr:
Screen 0: minimum 8 x 8, current 6400 x 1440, maximum 32767 x 32767
DP-0 connected primary 2560x1440+3840+0 (normal left inverted right x axis y axis) 597mm x 336mm
2560x1440 59.95*+ 143.86 119.88 69.92
2048x1280 59.96
1920x1200 59.88
1920x1080 143.85 60.00 59.94 50.00
1680x1050 59.95
1600x1200 60.00
1600x1000 59.87
1600x900 60.00
1440x900 59.89
1280x1024 75.02
1280x720 59.94 50.00
1024x768 75.03 60.00
800x600 75.00 60.32
720x576 50.00
720x480 59.94
640x480 75.00 59.94 59.93
DP-1 disconnected (normal left inverted right x axis y axis)
eDP-1-1 connected 1920x1080+1920+0 (normal left inverted right x axis y axis) 344mm x 194mm
1920x1080 144.00*+ 60.01 59.97 59.96 60.00 59.93
1680x1050 144.00 84.94 74.89 69.88 59.95 59.88
1600x1024 60.17
1400x1050 85.00 74.76 70.00 59.98
1600x900 59.99 59.94 59.95 59.82
1280x1024 144.00 85.02 75.02 60.02
1440x900 144.00 59.89
1400x900 59.96 59.88
1280x960 85.00 60.00
1440x810 60.00 59.97
1368x768 59.88 59.85
1360x768 59.80 59.96
1280x800 144.00 59.99 59.97 59.81 59.91
1152x864 100.00 85.06 85.00 75.00 75.00 70.00 60.00
1280x720 144.00 60.00 59.99 59.86 59.74
1024x768 144.00 85.00 75.05 60.04 85.00 75.03 70.07 60.00
1024x768i 86.96
960x720 85.00 75.00 60.00
928x696 75.00 60.05
896x672 75.05 60.01
1024x576 59.95 59.96 59.90 59.82
960x600 59.93 60.00
832x624 74.55
960x540 59.96 59.99 59.63 59.82
800x600 144.00 85.00 75.00 70.00 65.00 60.00 85.14 72.19 75.00 60.32 56.25
840x525 85.02 74.96 69.88 60.01 59.88
864x486 59.92 59.57
800x512 60.17
700x525 85.08 74.76 70.06 59.98
800x450 59.95 59.82
640x512 85.02 75.02 60.02
720x450 59.89
700x450 59.96 59.88
640x480 144.00 85.09 60.00 85.01 72.81 75.00 59.94
720x405 59.51 58.99
720x400 85.04
684x384 59.88 59.85
680x384 59.80 59.96
640x400 59.88 59.98 85.08
576x432 100.11 85.15 85.09 75.00 75.00 70.00 60.06
640x360 59.86 59.83 59.84 59.32
640x350 85.08
512x384 85.00 75.03 70.07 60.00
512x384i 87.06
512x288 60.00 59.92
416x312 74.66
480x270 59.63 59.82
400x300 85.27 72.19 75.12 60.32 56.34
432x243 59.92 59.57
320x240 85.18 72.81 75.00 60.05
360x202 59.51 59.13
360x200 85.04
320x200 85.27
320x180 59.84 59.32
320x175 85.27
HDMI-1-1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 510mm x 287mm
1920x1080 60.00*+ 59.96 59.93
1680x1050 69.88 59.95 59.88
1600x1024 60.17
1400x1050 74.76 70.00 59.98
1600x900 59.95 59.82
1280x1024 75.02 60.02
1440x900 59.89 59.90
1400x900 59.96 59.88
1280x960 60.00
1440x810 59.97
1368x768 59.88 59.85
1360x768 59.95 59.80 59.96
1280x800 59.99 59.97 59.81 59.91
1152x864 75.00 75.00 70.00 60.00
1280x720 60.00 59.99 59.86 60.00 59.74
1024x768 75.05 60.04 75.03 70.07 60.00
960x720 75.00 60.00
928x696 75.00 60.05
896x672 75.05 60.01
1024x576 59.95 59.96 59.90 59.82
960x600 59.93 60.00
832x624 74.55
960x540 59.96 59.99 59.63 59.82
800x600 75.00 70.00 65.00 60.00 72.19 75.00 60.32 56.25
840x525 74.96 69.88 60.01 59.88
864x486 59.92 59.57
800x512 60.17
700x525 74.76 70.06 59.98
800x450 59.95 59.82
640x512 75.02 60.02
720x450 59.89
700x450 59.96 59.88
640x480 60.00 75.00 72.81 75.00 66.67 59.94
720x405 59.51 58.99
720x400 70.08
684x384 59.88 59.85
680x384 59.80 59.96
640x400 59.88 59.98
576x432 75.00 75.00 70.00 60.06
640x360 59.86 59.83 59.84 59.32
512x384 75.03 70.07 60.00
512x288 60.00 59.92
416x312 74.66
480x270 59.63 59.82
400x300 72.19 75.12 60.32 56.34
432x243 59.92 59.57
320x240 72.81 75.00 60.05
360x202 59.51 59.13
320x180 59.84 59.32
1680x1050 (0x1c8) 146.250MHz -HSync +VSync
h: width 1680 start 1784 end 1960 total 2240 skew 0 clock 65.29KHz
v: height 1050 start 1053 end 1059 total 1089 clock 59.95Hz
1280x1024 (0x1cd) 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
1440x900 (0x1cc) 106.500MHz -HSync +VSync
h: width 1440 start 1520 end 1672 total 1904 skew 0 clock 55.93KHz
v: height 900 start 903 end 909 total 934 clock 59.89Hz
1024x768 (0x1d0) 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 (0x1d1) 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 (0x1d2) 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 (0x1d3) 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 (0x1d6) 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 (0x1d7) 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
1920x1080 (0x1c5) 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
Also to even have one external screen working, I had to use this solution:
https://askubuntu.com/a/1283964/1538925
One additional thing I noticed while experimenting with this.
If in ubuntu screen settings I manually disable HDMI monitor, then enable it, suddenly all screens will be working, at least till I log out or try to move the screens (which would be needed, as the re-enabled HDMI appears to the right (Internal - DP - HDMI) while my physical setup is with it on the left (HDMI - Internal - DP))
