Re: Problem with xorg tryng to dual head setup with two graphics cards (intel and nvidia)

On Tue, 26 Jul 2022 12:08:27 +0200
Mario Marietto <[email protected]> wrote:

> Hello to everyone.
>
> What I'm trying to do is to correctly configure the file xorg.conf because
> I want to use two gpus at the same time connected to two different monitors
> while using FreeBSD 13.1. It could be useful when I want to make some 3d
> modelling using Blender on the first monitor / gpu [nvidia 1060 or Intel
> UHD graphics 630] and using the second one (nvidia 1060 or Intel UHD
> graphics 630) to watch some tutorials. I've also got a third gpu (geforce
> RTX 2080 ti) ,but I want to keep it free to be passed through on a bhyve
> virtual machine. On the BIOS I've configured the Nvidia Geforce 1060 as the
> GPU with which the PC boots. So,this is the scheme that I want to follow :
>
>
> 1) monitor AOC -> hdmi cable ---> gpu nvidia geforce 1060
>
> 2) monitor Samsung SynchMaster ---> hdmi cable ---> gpu intel 'CoffeeLake-S
> GT2 [UHD Graphics 630]'
>
> 3) gpu geforce RTX 2080 ti without monitor,used only to be passed thru with
> bhyve
>
>
> Actually I'm using this xorg.conf :
> https://pastebin.ubuntu.com/p/DhW6RHS3zb/
>
> instead this is the Xorg.0.log file :
> https://pastebin.ubuntu.com/p/YtdPq9fngQ/
>
>
> In front of me I have the AOC monitor connected to the HDMI port of the
> Geforce 1060. On my right I have the monitor samsung syncmaster,that's
> connected to the HDMI port of the intel GPU. The 3 gpu (Geforce RTX 2080
> ti) is non connected to any monitor because I want to use it to be passed
> thru on a bhyve vm. What happens is that the samsung monitor works
> partially. The only 2 apps which can be directed to it (it is attached to
> the Intel GPU with the HDMI cable) are :
>
>
> [marietto@marietto ~]$ export DISPLAY=:0.1 ; konsole
>
> and :
>
> [marietto@marietto ~]$ export DISPLAY=:0.1 ; chrome
>
> (firefox can be displayed only on the screen 0 : don't know why)
>
>
> Here you can find the list of every PCI device attached to my PC :
>
> https://pastebin.ubuntu.com/p/Gx5DqckFQP/
>
>
> I can export some applications to the DISPLAY=:0.1 (monitor Samsung
> SynchMaster ---> hdmi cable ---> gpu intel 'CoffeeLake-S GT2 [UHD Graphics
> 630]). But this kind of usage is not comfortable at all. Infact I can't run
> another session of xorg because it says that one session is already
> running. Only some applications are displayed over it and If I invert the
> cable and the drivers on the xorg.conf file,placing as primary GPU the
> intel gpu attached to the AOC monitor and as secondary GPU the nvidia 1060
> attached to the samsung syncmaster,the behavior is the same,with the
> difference that I've inverted the monitors. I've tried to enable
> xinerama,but it does not work well. It freezes the mouse and
> anyway,attaching virtually two screens into only one is ridiculous,because
> they aren't attached physically. What I want to do is to be able to do some
> tasks on monitor 1 and some different tasks on monitor 2.
>
>
> # xrandr -q
>
> Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 32767 x 32767
> DVI-D-0 disconnected (normal left inverted right x axis y axis)
> DP-0 disconnected (normal left inverted right x axis y axis)
> DP-1 disconnected (normal left inverted right x axis y axis)
> HDMI-0 connected 1920x1080+0+0 (normal left inverted right x axis y
> axis) 598mm x 336mm
>    1920x1080     60.00*+  59.94    50.00    60.00    50.04
>    1680x1050     59.95
>    1440x900      59.89
>    1280x1024     75.02    60.02
>    1280x960      60.00
>    1280x720      60.00    59.94    50.00
>    1024x768      75.03    70.07    60.00
>    800x600       75.00    72.19    60.32    56.25
>    720x576       50.00
>    720x480       59.94
>    640x480       75.00    72.81    59.94    59.93
> DP-2 disconnected (normal left inverted right x axis y axis)
> DP-3 disconnected (normal left inverted right x axis y axis)
> DP-4 disconnected (normal left inverted right x axis y axis)
> DP-5 disconnected (normal left inverted right x axis y axis)
>
> arandr says that the only monitor connected is the HDMI-0,the monitor AOC
> connected to the nVidia 1060 gpu. But if I invert the drivers on xorg.conf
> and the cables,the only monitor connected will again be the HDMI-0,but this
> time it will be the Samsung Synchmaster.
>
> The reason for this behavior could have been explained here :
>
> https://forums.freebsd.org/threads/dual-head-setup-with-two-graphics-cards.62886/post-363187
>
> Anyway,I don't have a solution. Do you ?
>

A similar question from a Linux user with a laptop containing a NVIDIA
GPU and a Intel GPU was posted to unix.stackexchange.com here:

https://unix.stackexchange.com/questions/697517/how-to-correlate-xorg-conf-config-for-nvidia-gpu-with-xrandr-detected-screens

The answer seems to have solved his problem.

--
Gary Jennejohn