[Bug 96915] [APL] too many voltage retries / CPU pipe X FIFO underrun / audio errors when suspending to ram

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96915

--- Comment #6 from cprigent <christophe.prigent at intel.com> ---
Created attachment 127291
  --> https://bugs.freedesktop.org/attachment.cgi?id=127291&action=edit
APL__dmesg__with-patch-applied

ERROR CPU pipe B FIFO underrun is not reproduced when suspending to RAM with
the patch applied but I see it earlier in my log:

user at BXTP6:~/Desktop$ dmesg |grep ERROR
[   14.343070] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe B FIFO underrun
[  207.578429] [drm:intel_dp_start_link_train [i915]] *ERROR* failed to enable
link training
[  207.611828] [drm:intel_dp_start_link_train [i915]] *ERROR* failed to start
channel equalization

I also see 2 GPU Hangs, I reported it here: bug 98247

Platform BXT-P: 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
DMC 1.07
GuC 8.7

Kernel: 4.8.0 f79322d from http://cgit.freedesktop.org/drm-intel/
  commit f79322df75bf6193458ec601a345ba6bd86befca
  Author: Chris Wilson <chris at chris-wilson.co.uk>
  Date:   Tue Oct 11 10:16:23 2016 +0100
  drm-intel-nightly: 2016y-10m-11d-09h-16m-03s UTC integration manifest
with applied https://patchwork.freedesktop.org/patch/100578/

libdrm-2.4.71 a44c9c3 from git://anongit.freedesktop.org/mesa/drm
mesa: mesa-12.0.0 8b06176 from git://anongit.freedesktop.org/mesa/mesa
cairo 1.15.2 db8a7f1 from git://anongit.freedesktop.org/cairo
xorg-server-1.18.99.901-76 97a8353 from
git://git.freedesktop.org/git/xorg/xserver
xf86-video-intel 2.99.917-712 696f58f from
git://git.freedesktop.org/git/xorg/driver/xf86-video-intel
libva-1.7.2-38 3b7e499 from git://git.freedesktop.org/git/vaapi/libva 
vaapi-intel-driver: 1.7.2-133 dd73514 from
git://git.freedesktop.org/git/vaapi/intel-driver

External screens: ASUS PB238Q (HDMI), LG 25UM55D (DP)

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