I have tested kernel 4.2 in cauldron and nVidia driver fail to compile with that kernel. I have googled that it was an unexpected ABI change that is going to be reverted in a future revision. Could you add the patch to your 4.2 tree ? Here it is: https://lkml.org/lkml/2015/8/4/775 Reproducible: Steps to Reproduce:
Assignee: bugsquad => tmb
The revert got merged upstream in 4.2.2 currently building
Status: NEW => RESOLVEDResolution: (none) => FIXED