Wrong xrandr pattern match?

[a-m-s]

The applet doesn't appear to work correctly for me. It shows the Prime Profile I currently have selected, but does not offer any others for me to switch to.

If I select On-demand mode in the NVidia X Server Settings, reboot, and then try offload-glx, it says xrandr: NVIDIA GPU screen not detected.

I have an NVidia Quadro M3000M. It shows in xrandr --listproviders like this:

Providers: number : 2
Provider 0: id: 0x2b5 cap: 0x1, Source Output crtcs: 4 outputs: 6 associated providers: 1 name:NVIDIA-0
Provider 1: id: 0x49 cap: 0x6, Sink Output, Source Offload crtcs: 3 outputs: 7 associated providers: 1 name:modesetting

The problem seems to be that mate-optimus is expecting to find NVIDIA-G where I have NVIDIA-0.

If I change the pattern match to NVIDIA-0, then both scripts function as expected (although I can't see any performance difference between on-demand and performance mode, but I don't think that's your fault as I still can't if I reboot into performance mode only.)

[MJimitater]

I had that problem too, until I created a file at /etc/X11/xorg.conf.d/nvidia.confand put

    Section "ServerLayout"
      Identifier "layout"
      Option "AllowNVIDIAGPUScreens"
    EndSection

in it. Then I rebooted and xrandr --listproviders showed NVIDA-G0

[a-m-s]

I created that file, but it doesn't seem to have had an affect on my system.

[MJimitater]

What driver are you using?

[a-m-s]

NVidia 435.21 from Ubuntu 19.10. The driver appears to be working fine; it's just the optimus applet that would be nice to have.

[MJimitater]

I see. I found this nice instruction, its for Mint actually, but works well for Ubuntu too. By following these instructions and also creating that file at /etc/X11/xorg.conf.d/nvidia.conf, I managed to have NVIDIA-G0 show up. Try it out and report back how it went :)

[a-m-s]

I followed those instructions, I think.
Good:

• I get the NVIDIA-G0 thing, so the applet detects the driver.
• "On demand" mode works: glxinfo shows Intel by default, and shows NVidia with the magic environment variables.

Bad:

• nvidia-settings shows no X display and has can't make application profiles with any actual settings in them.
• Neither nvidia-settings nor mate-optimus-applet can change the mode. It looks like it's changed, but there's no actual difference in behaviour after reboot.
• The applet is therefore not useful.

So, it seems like I can choose between full mode switching via the applet (if I patch it to allow NVIDIA-0), or on demand switching via environment variables, but not both. Oh well.

I still think the applet needs to recognise both strings.

[MJimitater]

@a-m-s thanks, good to know. Yes, I agree that applet needs to recognize both strings.