[Bug 96591] [4.6 regression] FBC doesn't notice writes to scanout

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96591

yann <yann.argotti at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #6 from yann <yann.argotti at intel.com> ---
Thanks Vampl, 

you are right fbc default is off but on BDW this is enabled by default - see
following commit 80788a0fbbdfbb125e3fd45a640cddb582160bc7 
2016-06-20 drm/i915/fbc: sanitize i915.enable_fbc during FBC init    Paulo 

The DDX driver changes its behavior depending on the value it reads
from i915.enable_fbc, so sanitize the value in order to allow it to
know what's going on. It uses this in order to choose the defaults for
the TearFree option. Before this patch, it would read -1 and always
assume that FBC was disabled, so it wouldn't force TearFree.

v2: Extract intel_sanitize_fbc_option() (Chris).
v3: Rebase.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>
Link:
http://patchwork.freedesktop.org/patch/msgid/1460574069-14005-1-git-send-email-paulo.r.zanoni@intel.com

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