[Bug 90046] [HSW ] test S3 with 3pipe cause *ERROR*

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90046

--- Comment #2 from xubin <bin.a.xu at intel.com> ---
Test it with latest drm-intel-nightly kernel
(commit 4b2be843fab906467eed62265f5066418c73649c),the issue still exist.

Output:
[   54.724540] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR*
uncleared pch fifo underrun on pch transcoder A
[   54.724549] [drm:cpt_irq_handler [i915]] *ERROR* PCH transcoder A FIFO
underrun
[   54.738062] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR*
uncleared fifo underrun on pipe B
[   54.738071] [drm:ironlake_irq_handler [i915]] *ERROR* CPU pipe B FIFO
underrun

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