Use two opengl interface concurrently

reith · n00b Joined: 13 Nov 2015 Posts: 16

I have a PC with two GPUs, one intel and and one nvidia and one monitor. I generally don't run GUI programs on nvidia card, just some cuda stuff. but sometimes i play games and I prefer nvidia card be used then.

So I defined two X screens and one server layout using both. HDMI cable is connected to nvidia card and VGA card is connected to intel. I can start i3 on both screens but the first i3 locks nvidia interface, so if I configured opengl to use x11-xorg and started i3 in intel's screen; if I start another i3 in nvidia screen and switch opengl interface to nvidia, i wont be able to run opengl software, glxinfo shouts:

audiodef · Posted: Sat Mar 24, 2018 2:29 pm Post subject:

Are you working with an Optimus laptop, or are you using a desktop machine on which an Nvidia card is installed? Because if you're using the latter, I would seriously like to know how you convinced your BIOS to output from both cards simultaneously. Isn't it normally a choice between on-board and discrete in the BIOS?
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reith · n00b Joined: 13 Nov 2015 Posts: 16

It's desktop. It send output to just one card until os is loaded (actually ttys too are accessible by just one card) and in bios there is an option to choose that card. I defined multiple device and screens in xorg configuration so now I can run X programs on desired screen (DISPLAY) if I enabled Mutli-Monitor option in bios. My bios has some option like this https://goo.gl/images/qJbwZi

audiodef · Posted: Sat Mar 24, 2018 3:07 pm Post subject:

Very nice. ASUS makes good boards.

I can't think of any solution to your question offhand, but I am interested, so I will be following this thread.
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hhfeuer · Apprentice Joined: 28 Jul 2005 Posts: 185

Having different GLX providers depending on screen will only be possible with yet unreleased Xorg 1.20 (glxvnd). With Xorg 1.19 this should (in theory) be possible with two Xservers. Have the normal xorg.conf just configure the intel card and create a second xorg-nvidia.conf in /etc/X11 with a Section "Files" pointing to nvidia glx /usr/lib64/opengl/nvidia/lib
Then start the second Xserver using that xorg-nvidia.conf and have a working glvnd setup so the clients use the right opengl libs.