Quoting Maarten Lankhorst (2017-08-10 13:41:56)
> The test shows the need for coherency through the dma-buf sync ioctl's,
> but forgets to call dirtyfb, without this the FB Is never updated and we
> will fail anyway.
> Solve this by adding a drmModeDirtyFB, I've confirmed by adding -n
> that the test will still faill without prime_sync_end anyway,
> so the test is still useful.
> Signed-off-by: Maarten Lankhorst <maarten.lankho...@linux.intel.com>
> Cc: Marta Löfstedt <marta.lofst...@intel.com>
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101109

Tested-by: Chris Wilson <ch...@chris-wilson.co.uk> #llc

Have a patch for the failure in the first check, yet more object
coherency mess.
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