Updated the test system to Kernel 4.2-rc6, and the NVIDIA ‘GPL-Only’ problem still persists:  Building modules, stage 2.  MODPOST 2 modules FATAL: modpost: GPL-incompatible module nvidia.ko uses GPL-only symbol ‘flush_workqueue’ /usr/src/linux-4.2-rc6/scripts/Makefile.modpost:90: recipe for target ‘__modpost’ failed make[3]: *** [__modpost] Error 1 /usr/src/linux-4.2-rc6/Makefile:1389: recipe for target ‘modules’ failed make[2]: *** [modules] Error 2 make[2]: Leaving directory ‘/usr/src/linux-4.2-rc6’ Makefile:146: … Continue reading →