[Bug 59999] [ILK,IVB]kms_flip error: inter-flip ts jitter

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=59999

yanbing <bingx.a.yan at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW

--- Comment #3 from yanbing <bingx.a.yan at intel.com> ---
(In reply to comment #2)
> Hm, we seem to miss exactly a frame ...
> 
> A few questions:
> - How reproducible is this? I'm running some of the mentioned tests in an
> endless loop on my ilk yet, it seems solid.
> - Does booting with drm_kms_helper.poll=0 help?
> - Does this only happen on specific ilk/ivb machines (e.g. specific monitors
> connected) or on all of them? What about snb?
> - On a quick lock the ivb machine has only VGA connected. Does the issue
> also happen on when other outputs instead of VGA are connected, maybe with
> different screens ...

1. The reproducing steps just as "./kms_flip --run-subtest
flip-vs-absolute-wf_vblank" and it will be always fail on my ilk.

2.I had add drm_kms_helper.poll=0 in grub.cfg,but it doesn't help by booting
with it,those subcases still fail on ilk.

3.Yes，we had 4 ilk machines,but only 1 of them had this bug,others on these
subcases are all pass. And as same as ilk,only 1 of ivb machines had this bug, 
not all of ilk & ivb.

4.Snb doesn't had this bug.

***5.On the ivb,I was testing these subcase by 3 monitors connecting at the
same time.(VGA & DP & HDMI).Now I retested one time by connectting only 1
monitor.I found you are right,when I connected with VGA,these fail,and all pass
except by connecting with VGA.

6.On the ilk,it's a desktop notebook and doesn't connect by none of extranal
monitor.

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