Comment 19 for bug 1589379

This bug got solved in 4.9-rc2, from what I saw:

- up to commit 9faa6b0277fab4ab91db4d69bc47566fdfbae48b drm/amd/powerplay: fix static checker warnings in smu7_hwmgr.c
-> the bug is reproduced

- up to one commit above, eeb2fa0c97ba661f8b7fb210a1de10928b67a47b drm/amdgpu: potential NULL dereference in debugfs code
-> I have a black screen after resuming the system

- up to one commit above, 24e8df6a6837d6cff182e84b838dc1d6971251fc drm/amd/powerplay: fix static checker warnings in smu7_hwmgr.c
-> the bug is not reproduced, the resume is OK.