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<base href="https://bugs.freedesktop.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [APL] too many voltage retries / CPU pipe X FIFO underrun / audio errors when suspending to ram and crash after 20 iterations"
href="https://bugs.freedesktop.org/show_bug.cgi?id=96915">96915</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[APL] too many voltage retries / CPU pipe X FIFO underrun / audio errors when suspending to ram and crash after 20 iterations
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>critical
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>christophe.prigent@intel.com
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=125053" name="attach_125053" title="dmesg-error">attachment 125053</a> <a href="attachment.cgi?id=125053&action=edit" title="dmesg-error">[details]</a></span>
dmesg-error
Platform: APL system
CPU Name : Intel(R) Genuine Processor @ 1.1 GHz (family: 6, model: 12,
stepping: 9) 4 cores
QDF : Q6HE
SoC : B1
CRB : Apollo Lake DDR3L RVP1A FAB2
Reworks : R19, R20
Software
Bios: 144_B10 APLK_B0_IFWI_X64_R_2016_06_27_0956_SPI_RVP1.bin from
\\gar\ec\proj\ba\CCG\APL
BIOS\External\BIOS_Release\Daily\v144_10_2016_WW27.1\IFWI\IFWI_RVP1_Release\IFWI
KSC: 1.15
Linux distribution: Ubuntu 16.04 64 bits
Kernel: tag drm-intel-testing-2016-07-11 4.7.0-rc6 0230e3c from
<a href="http://cgit.freedesktop.org/drm-intel/">http://cgit.freedesktop.org/drm-intel/</a>
commit 0230e3c4eb76cf8f57cf40db0e908b96b84e3911
Author: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
Date: Sun Jul 10 13:24:46 2016 +0100
drm-intel-nightly: 2016y-07m-10d-12h-23m-38s UTC integration manifest
drm: libdrm-2.4.68-14 8c8d5ddfrom git://anongit.freedesktop.org/mesa/drm
mesa: mesa-11.2.2 3a9f628from git://anongit.freedesktop.org/mesa/mesa
cairo: 1.15.2 db8a7f1 from git://anongit.freedesktop.org/cairo
xserver: xorg-server-1.18.0-454 033888e from
git://git.freedesktop.org/git/xorg/xserver
xf86-video-intel: 2.99.917-676 26f8ab5 from
git://git.freedesktop.org/git/xorg/driver/xf86-video-intel
libva: libva-1.7.0-26 c36971c from git://git.freedesktop.org/git/vaapi/libva
vaapi-intel-driver: 1.7.0-53 bcde10d from
git://git.freedesktop.org/git/vaapi/intel-driver
GuC 8.7
DMC 1.07 from <a href="https://01.org/linuxgraphics/downloads/broxton-dmc-1.07">https://01.org/linuxgraphics/downloads/broxton-dmc-1.07</a>
Steps:
------
1. Suspend to RAM and resume:
Execute commands
sudo -s
echo mem > /sys/power/state
Wait 30 seconds
Resume with keyboard
2. Wait 30 seconds
3. Repeat previous steps several times
Actual results:
---------------
2. Log shows example:
[ 136.397754] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe B FIFO underrun
[ 144.781652] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR*
failed to enable link training
[ 144.804637] [drm:intel_dp_start_link_train [i915]] *ERROR* failed to start
channel equalization
[ 154.070393] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe C FIFO underrun
3. DUT crashed after 20 iterations
Expected result:
----------------
No such error
Suspend to ram and resume works each time</pre>
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