linux-kernel - [lkp] [drm/i915] 396e33ae20: [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo underrun on pipe B

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Date:	Mon, 11 Jan 2016 09:35:12 +0800
From:	kernel test robot <ying.huang@...ux.intel.com>
TO:	Matt Roper <matthew.d.roper@...el.com>
CC:	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
Subject: [lkp] [drm/i915] 396e33ae20:
 [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo
 underrun on pipe B

FYI, we noticed the below changes on

git://anongit.freedesktop.org/drm-intel drm-intel-next-queued
commit 396e33ae204f52abebec9e578f44c749305500f4 ("drm/i915: Add two-stage ILK-style watermark programming (v10)")


+--------------------------------------------------+------------+------------+
|                                                  | 2dfb0b816d | 396e33ae20 |
+--------------------------------------------------+------------+------------+
| boot_successes                                   | 8          | 19         |
| boot_failures                                    | 0          | 4          |
| drm:intel_set_cpu_fifo_underrun_reporting[i915]] | 0          | 4          |
| drm:intel_cpu_fifo_underrun_irq_handler[i915]]   | 0          | 4          |
| drm:intel_set_pch_fifo_underrun_reporting[i915]] | 0          | 4          |
| drm:intel_pch_fifo_underrun_irq_handler[i915]]   | 0          | 4          |
+--------------------------------------------------+------------+------------+



[   36.077826] NFS: Registering the id_resolver key type
[   36.078178] Key type id_resolver registered
[   36.078444] Key type id_legacy registered
[   60.884026] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo underrun on pipe B
[   60.884659] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun
[   60.885221] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder B
[   60.885887] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder B FIFO underrun
[   61.180651] random: nonblocking pool is initialized
[   81.430503] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo underrun on pipe C
[   81.431193] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe C FIFO underrun
[   81.431782] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder C
[   81.432474] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder C FIFO underrun


To reproduce:

        git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
        cd lkp-tests
        bin/lkp install job.yaml  # job file is attached in this email
        bin/lkp run     job.yaml



Thanks,
Kernel Test Robot

View attachment "config-4.4.0-rc4-00445-g396e33a" of type "text/plain" (143112 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (15948 bytes)

View attachment "job.yaml" of type "text/plain" (2852 bytes)

Download attachment "reproduce.sh" of type "application/x-sh" (156 bytes)