My Dell 7285 tablet suspends (Suspend-to-RAM, ACPI State: S3, Label: "deep") and wakes up and everything works well.
Except: the internal display only shows the dell logo.
The external display works and I can login and continue working with the external display. The internal screen also does not work if no external screen is attached.
The system has a Intel HD Graphics 615 (Kaby Lake GT2) graphics card. With Windows suspend, wake up works flawlessly.
What can I do to debug this?
Or is there a way to restart the graphics card on resume?