[Bug 85898] [IVB/HSW]igt/kms_flip subcases sporadically cause *ERROR* uncleared pch fifo underrun on pch transcoder A

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85898

--- Comment #7 from lu hua <huax.lu at intel.com> ---
Created attachment 109986
  --> https://bugs.freedesktop.org/attachment.cgi?id=109986&action=edit
dmesg with patch

Test this patch 5 cycles, it works well.

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