It is also recommended to _disable_ VT-d(Intel Virtualization Technologies) in the BIOS when using:
i915_semaphores=1
boot option.
This increases the stability of the stack / system, according to Intel's release notes for this option.
This fixed my DELL Inspiron 3646 using a J2900 cpu BayTrail / ValleyView SoC on Ubuntu 15.04.
It is also recommended to _disable_ VT-d(Intel Virtualization Technologies) in the BIOS when using:
i915_semaphores=1
boot option.
This increases the stability of the stack / system, according to Intel's release notes for this option.
This fixed my DELL Inspiron 3646 using a J2900 cpu BayTrail / ValleyView SoC on Ubuntu 15.04.