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?


In the end I installed Ubuntu 18.10 and it now works.

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