@laminar, Hi Chris, welcome to the forum again!
I had not asked you if you already read How to get the best out of this forum.
I can take a look at your profile to find your previous posts, to find background information.
But it is preferable for any poster to provide complete information in any new post.
I need complete information, display used, processor used, connection module if applicable, to try to give an answer.
And sometimes I need a code example, to understand what a poster tries to do.
The handling for partial update after processor deep sleep as described in the link you quoted only deals with continuation of partial updates to the display. The graphics buffer content on the processor is not retained. It may contain random data, garbage; may need to be cleared.
I did not test this feature, but I believe it works. You can provide an example (needs to be compile-able) if it doesn't work for you.
Jean-Marc