Hikey 970 kernel drm driver issue

Products Support HiKey970
#1 
    I use the Hikey970 lebian and it works very well,
but I change the kernel to the code of https://github.com/96boards-hikey/linux hikey970-v4.9,
after I build and use this kernel, the drm driver seems to have some issues and the xorg can’t run.
Do someone know about this?
#2

There have been several attempts to fix issues with the kernel.
Most fixes have ended up in the tree at https://github.com/hihope-hikey/linux/tree/hikey970-debain
Other fixes seem to have been lingering around at other places.

I have tried to combine them at https://github.com/janrinze/linux/tree/hikey970-v4.9-jrp

Hopefully we get some good fixes and be able to use the board to its full potential.

#3

After comparing several branches it seems that https://github.com/hihope-hikey/linux/tree/hikey960-v4.9 has the most up-to-date sources.