[Bug 100020] [igt]kms_frontbuffer_tracking at fbc-suspend fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100020

krisman at collabora.co.uk changed:

           What    |Removed                     |Added
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             Status|REOPENED                    |ASSIGNED

--- Comment #8 from krisman at collabora.co.uk ---
(In reply to Dorota Czaplejewicz from comment #7)
> I think your report is something else; several asserts are next to each
> other.

I understand your point and I agree, The SNB issue should be handled
separately, I'm opening a new bug for that.

Still, I reproduced the bug you reported here on a Haswell this time. 
Bisecting Linux shows the failure started after f7e9b004b8a3 ("drm/i915/fbc:
inline intel_fbc_can_choose()"), which introduced a new error handling for the
CRTC FBC selection.

The proposed fix is a patch to IGT  (attached), which catches the error
handling scenario introduced by that patch.  

Patch also submitted to the IGT list for review.

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