NVIDIA - Ubuntu 20.04 - HDMI second monitor with blank screen, but xrandr detects it [Bug reported on Launchpad and freedesktop's gitlab]

Question

Edit on 15/10/2020: This's a bug found on the kernel and intel/drm drivers.

More info: https://gitlab.freedesktop.org/drm/intel/-/issues/2181

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1871721

ORIGINAL POST:

For some reason, the second monitor connected via HDMI is in black (black screen), but xrandr and Nvidia Settings detects it.

    Screen 0: minimum 8 x 8, current 2720 x 1080, maximum 16384 x 16384
eDP-1-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 344mm x 193mm
   1920x1080 60.00*+ 59.97 59.96 59.93
   1680x1050 59.95 59.88
   1600x1024 60.17
   1400x1050 59.98
   1600x900 59.99 59.94 59.95 59.82
   1280x1024 60.02
   1440x900 59.89
   1400x900 59.96 59.88
   1280x960 60.00
   1440x810 60.00 59.97
   1368x768 59.88 59.85
   1360x768 59.80 59.96
   1280x800 59.99 59.97 59.81 59.91
   1152x864 60.00
   1280x720 60.00 59.99 59.86 59.74
   1024x768 60.04 60.00
   960x720 60.00
   928x696 60.05
   896x672 60.01
   1024x576 59.95 59.96 59.90 59.82
   960x600 59.93 60.00
   960x540 59.96 59.99 59.63 59.82
   800x600 60.00 60.32 56.25
   840x525 60.01 59.88
   864x486 59.92 59.57
   800x512 60.17
   700x525 59.98
   800x450 59.95 59.82
   640x512 60.02
   720x450 59.89
   700x450 59.96 59.88
   640x480 60.00 59.94
   720x405 59.51 58.99
   684x384 59.88 59.85
   680x384 59.80 59.96
   640x400 59.88 59.98
   576x432 60.06
   640x360 59.86 59.83 59.84 59.32
   512x384 60.00
   512x288 60.00 59.92
   480x270 59.63 59.82
   400x300 60.32 56.34
   432x243 59.92 59.57
   320x240 60.05
   360x202 59.51 59.13
   320x180 59.84 59.32
DP-1-1 disconnected (normal left inverted right x axis y axis)
HDMI-1-1 disconnected (normal left inverted right x axis y axis)
HDMI-1-2 connected 800x600+1920+0 (normal left inverted right x axis y axis) 1600mm x 900mm
   1920x1080 60.00 + 50.00 59.94 30.00 25.00 24.00 29.97 23.98
   1920x1080i 60.00 50.00 59.94
   1280x1024 60.02
   1360x768 60.02
   1152x864 59.97
   1280x720 59.81 60.00 50.00 59.94
   1024x768 60.00
   800x600 60.32*
   720x576 50.00
   720x576i 50.00
   720x480 60.00 59.94
   640x480 60.00 59.94
   720x400 70.08
DP-1-2 disconnected (normal left inverted right x axis y axis)
HDMI-1-3 disconnected (normal left inverted right x axis y axis)

I tried with propietary drivers of Nvidia and Nouveau's drivers, and I have the same result. On Ubuntu 18.04 with the LTS Kernel (4.15 was?) works perfectly. Same with Windows 10. Since 19.10 it doesn't work.

The nvidia-drm modeset is on 0 (nvidia-drm modeset=0).

Laptop: Asus Intel: i5-6300 Graphic card: Nvidia GTX960m

PS: With nomodeset it works perfectly. But still, it doesn't work with propietary drivers and nouveau.

PS2: I tried with only Nvidia and only Intel graphics. No results.

PS3: I tried with a Live USB and it doesn't work neither the second monitor. This just detects a second monitor, but in the second monitor the only thing I can see is a blank screen. I'm tired trying to make this work seeing a lot of pages. Please, if anyones can tell me if someone had a similar problem or what I can do. I don't want to use again W10. Thanks!

Answer 1

1. In the file /usr/share/X11/xorg.conf.d/10-nvidia.conf, add the line:

   Option "PrimaryGPU" "Yes"
   

2. In the file /usr/share/X11/xorg.conf.d/10-amdgpu.conf, change the line

   from

   Driver "amdgpu"
   

   to

   Driver "modesetting"`
   

Answer 2

Finally I found the answer. It's something related to the kernel and the GPU Intel (it's a hybrid) since 4.16/4.17 version. So let's say it's a "bug".

More info: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1871721

https://gitlab.freedesktop.org/drm/intel/-/issues/2181

Answer 3

Noctis-if we followed "You can force the upgrade, however, with the following steps:

close Update Manager if it’s still running open a terminal in the same way you opened Update Manager type update-manager -d and press enter" --then we might as well become a Windows enthusiast --with even cruder thoughts on how to re-arrange any earlier and possibly required non looping essentials. ??

c/f

Is the "Final Release" a "Development Release"?

shalom

Answer 4

Not sufficient space for comment-only

-Was proposing that any difficulty appearing from 19.10 or 20.04 is not surprising given neither are final releases. Hence the fun and games you raise .

c/f potentially : (i) "I run the Ubuntu 18.04. Had that issue myself. The solution for me was to: plug all monitors to my laptop go to Settings -> Displays having only 1 display (laptop) on and 2 monitors connected but black turn on all displays by clicking their names (switching between them) and clicking the input for that" (answered Apr 8 '19 at 8:21 red777) –though imho may be fairly suspect --in comparison TO :

(ii)

With the help of this solution, I realized it is just a matter of some basic math and xrandr commands which I will outline as simply as I can here:

Run xrandr to determine the names of your display outputs. In my case, I have:

eDP-1 (Internal) DP-2-2 (External, Dell 1920x1080) DP-2-1 (External, Eizo 1280x1024, rotated to the right) Calculate the full size of your framebuffer --fb, in my case, I want to use only my external displays:

diagram

First clear/rest xrandr settings

xrandr -s 0 Then turn off the laptop display

xrandr --output eDP-1 --off Then position the primary display to 0x0, set as --primary and set panning to its own resolution:

xrandr --output DP-2-1 --auto --scale 1x1 --pos 0x0 --primary --panning 1920x1080 Then position the second screen to the right at 1920x0, set the framebuffer and rotate it accordingly:

xrandr --output DP-2-2 --auto --scale 1x1 --pos 1920x0 --fb 2944x1280 --right-of DP-2-1 --rotate left Popping these lines into a script I run after docking helps set everything up, and it resets back to the internal LCD when I remove it. 18.04 Multiple monitor issues ???

Answer 5

I solved it with the following: Edit /lib/modprobe.d/nvidia-kms.conf

and comment the line options nvidia-drm modeset=0 with an #

Maybe there is another way to disable the option, but I've tried many and only this one worked.