[Bug 90418] Front buffer tracker is not invalidating the fb obj for DRRS/PSR

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90418

--- Comment #3 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to Ramalingam C from comment #2)
> Chris,
> 
> >> That's the expected behaviour for fbdev since it does not wrap access to the framebuffer. 
> Not getting the invalidate calls is expected?

For fbdev, yes.

> >> Are you saying that you observe this after the display server is active?
> Yes. Even when ubuntu Desktop is up, this behavior(absence of invalidate) is
> observed.

Since invalidate is only called at the start of a write transaction, yes. The
desktop should only be flipping (not even drawing into the scanout) which only
triggers flush on the change of buffers.

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