Minecraft (1.20.6) ignores optirun and starts with iGPU

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  1. Optirun works fine. I tested it with several applications like blender, glxgears, openspades, rigs of rods
  2. I tried Modrinth and PolyMC as Minecraft launchers, both having the problem described in the title.
  3. I tried sudo optirun, optirun, primusrun, sudo primusrun
  4. This problem didnt occur on my last manjaro installation for some reason (it was 1.20.4 back then if that matters).

The following code snippet seams interesting: It says my GPU (Nvidia Quadro K1000, more details in profile) isn’t supported, but why tf not, i mean it worked a while ago on an old installation.

[16:05:49] [Render thread/INFO]: OpenGL Vendor: Intel
[16:05:49] [Render thread/INFO]: OpenGL Renderer: Mesa Intel(R) HD Graphics 4000 (IVB GT2)
[16:05:49] [Render thread/INFO]: OpenGL Version: 4.2 (Core Profile) Mesa 24.0.6-manjaro1.1
[16:05:49] [Render thread/INFO]: Initializing ImmediatelyFast 1.2.15+1.20.6 on Mesa Intel(R) HD Graphics 4000 (IVB GT2) (Intel) with OpenGL 4.2 (Core Profile) Mesa 24.0.6-manjaro1.1
[16:05:49] [Render thread/WARN]: Force disabling fast buffer upload optimization due to unsupported GPU
[16:05:49] [Render thread/INFO]: Found Iris/Oculus 1.7.0+mc1.20.5. Enabling compatibility.

Is it maybe due to my mods? I use Fabulously Optimized (BETA) for 1.20.6

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Quadro K1000 is probably using the legacy nvidia-390xx driver, right? I have a similar problem on my Quadro K2100M and minecraft 1.21.1. I think a recent update to minecraft broke compatibility with bumblebee for integrated/discrete GPU switching, and 390xx doesn’t support the newer PRIME method.

You can switch to the open-source nouveau driver and use PRIME, but the performance is so bad there’s no point.

What worked for me is giving up dynamic switching and going with optimus-manager+bbswitch, which requires you to log out of X every time you want to switch, but did force minecraft to use the right GPU…

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That seems to be it. I didnt really understand your last point, but is not too big of an issue anyway as my NVIDIA K1000M isnt much better than my Intel 3rd gen 4000