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dabeegmon 07-17-2017 11:22 AM

working with xrandr 1.5 not finding how to connect second or third gpu
Running debian buster (testing) using lxqt. Have 3 nvidia 570 gpus and 4 1920x1080 monitors. Found that there were some issues with proprietary drivers nvidia 375.66 - - - was having one gpu halt and upon reboot things seemed to work again. The time between reboots was getting down to less than 12 hrs when I landed up with a system with corrupted networking on a reboot. So in the process of re-install I decided to try the Nouveau drivers instead. So now I have a one gpu 2 monitor system available. Got to very much like the four monitors for my work layout so I want the other two monitors working.

Using xrandr I can see Provider 0,1 and 2.
DVI-I-1 and DVI-I-2 are connected.
DVI-I-2-5 and DVI-I-2-6 are listed as disconnected.

I have been able to create a virtual screen of 3840 x 3000 which is how I had things before.
Tried $ xrandr --addmode DVI-I-2-5 1920x1080
then DVI-I-2-5 still shows as disconnected but with a resolution of 1920x1080 60.00
Next I tried $ xrandr --output VGA-2 --mode 1920x1080 --pos 1280x1280 --rotate inverted
result - - warning: output VGA-2 not found; ignoring

Any information I haven't provided that would help others help me?

I can't find any guides on how to setup xrandr to use multiple gpus AND more than 2 or 3 monitors (usually from only 1 gpu). Most of the randr information I can find is for at newest randr 1.3 and I have 1.5.

I've found
likely everything I need is hidden in this file but for the life of me I can't figure out what commands to use. If I were an expert I wouldn't be asking but I'm not and there are no examples to follow (or try).

Suggestions please?

(Maybe do I have to go for newer proprietary drivers? (rather not I sort of like the no issues right now with Nouveau!)


jefro 07-18-2017 02:58 PM

Please post your thread in only one forum. Posting a single thread in the most relevant forum will make it easier for members to help you and will keep the discussion in one place. This thread is being closed because it is a duplicate.

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