I have a System 76 Gazelle laptop with a Nvidia GTX 1060 Ti running Fedora 31 KDE Spin. I followed the instructions in this post to install and setup the Nvidia drivers from RPMFusion. When I attempt to use Prime Render Offload, it works for Vulcan, but I get an error message for GLX.
$ # As shown @ https://rpmfusion.org/Howto/Optimus#PRIME_Render_Offload
$ __NV_PRIME_RENDER_OFFLOAD=1 vkcube #works
$ __NV_PRIME_RENDER_OFFLOAD=1 __GLX_VENDOR_LIBRARY_NAME=nvidia glxinfo | grep vendor
X Error of failed request: BadValue (integer parameter out of range for operation)
Major opcode of failed request: 151 (GLX)
Minor opcode of failed request: 24 (X_GLXCreateNewContext)
Value in failed request: 0x0
Serial number of failed request: 100
Current serial number in output stream: 101
Based on the “Troubleshooting” section of Nvidia’s documentation on Prime Render Offloading, I find that glamorgl is loaded correctly:
$ grep "glamor" < /var/log/Xorg.0.log
[ 22.149] (II) Loading sub module "glamoregl"
[ 22.149] (II) LoadModule: "glamoregl"
[ 22.149] (II) Loading /usr/lib64/xorg/modules/libglamoregl.so
[ 22.162] (II) Module glamoregl: vendor="X.Org Foundation"
[ 22.782] (II) modeset(0): glamor X acceleration enabled on Mesa Intel(R) UHD Graphics (CML GT2)
[ 22.782] (II) modeset(0): glamor initialized
Also, the kernel module appears to have a slightly different name, but be loaded correctly:
$ lsmod | grep nvidia
nvidia_drm 61440 2
nvidia_modeset 1220608 3 nvidia_drm
nvidia_uvm 1150976 0
nvidia 28286976 105 nvidia_uvm,nvidia_modeset
i2c_nvidia_gpu 16384 0
drm_kms_helper 266240 2 nvidia_drm,i915
drm 626688 15 drm_kms_helper,nvidia_drm,i915
Creating Nvidia’s recommended xorg.conf results in my not being able to use an external monitor, but does not remove the error message above.
Please advise on how I can further troubleshoot the Prime Render Offloading.