Black screen, DP link training errors

Submitted by Luya Tshimbalanga @luyatshimbalanga

Assigned to Default DRI bug account

Link to original bug (#100949)

Description

Created attachment 131232
dmesg boot from X550Z

Recent kernel broke the handling of power management for CIK/SI hybrid laptop using the latest 4.9.25-20170502 from https://cgit.freedesktop.org/~agd5f/linux/?h=amd-staging-4.9

Notable highlight:

[ 25.671428] kfd kfd: Allocated 3944480 bytes on gart for device(1002:130d)
[ 25.671449] kfd kfd: error getting iommu info. is the iommu enabled?
[ 25.671493] kfd kfd: Error initializing iommuv2 for device (1002:130d)
[ 25.671558] Creating topology SYSFS entries
[ 25.671642] kfd kfd: device (1002:130d) NOT added due to errors

[ 695.257618] [drm:amdgpu_atombios_dp_link_train [amdgpu]] ERROR displayport link status failed
[ 695.257654] [drm:amdgpu_atombios_dp_link_train [amdgpu]] ERROR clock recovery failed

For a while, suspend/resume will lock up in back screen forcing a hard reset. Laptop is Asus X500ZE equipped with Kaveri and Hainan dual GPU.

Attachment 131232, "dmesg boot from X550Z":
dmesg-x550ze.txt