Installed Kernel 4.0-rc2 on the test system, and details of changes from -rc1 are here: http://lkml.iu.edu/hypermail/linux/kernel/1503.0/01963.html

Radeon on the HP6830 laptop is still broken:

[drm r600_ring_test [radeon]] *ERROR* radeon: ring 0 test failed (scratch(0x8504)=0xFFFFFFFF)
radeon 0000:01:00.0: disabling GPU acceleration
<< HANG >>

Same comments apply as for -rc1 – the patched NVIDIA 346.47 driver and VMware 11.1 with the vmnet patch compile and load/run OK..     Temporary workaround, to get the HP6830 to boot, is to disable the Radeon DRM driver, and use framebuffer..

$ uname -a
Linux rg6830l 4.0.0-rc2 #3 SMP Tue Mar 3 16:18:46 PST 2015 x86_64 x86_64 x86_64 GNU/Linux

Robert Gadsdon.  March 4, 2015