[Bug 94706] New: [APL] Console is very slow

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94706

            Bug ID: 94706
           Summary: [APL] Console is very slow
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: christophe.prigent at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 122567
  --> https://bugs.freedesktop.org/attachment.cgi?id=122567&action=edit
kern.log when booting with acpi off

Platform: Broxton P A0 Platform 
CPU Name : Intel(R) @ 1.2 GHz (family: 6, model: 92, stepping: 8) – 4 cores
SoC : BROXTON-P A0
QDF : QYE2
CRB : Apollo Lake RVPC1 Fab1
Mandatory Reworks : R14 , R06C and R16
Software 
APLKRVPA.X64.0116.R20.1512211905
KSC: 1.05
Linux distribution: Ubuntu 15.10 64 bits
Kernel: drm-intel-nightly 4.5.0 e7a7673 from
http://cgit.freedesktop.org/drm-intel/
  commit e7a7673e9840fe8b50a5a2894c75565ec7858a00
  Author: Daniel Vetter <daniel.vetter at ffwll.ch>
  Date:   Sat Mar 19 11:10:45 2016 +0100
  drm-intel-nightly: 2016y-03m-19d-10h-09m-53s UTC integration manifest
libdrm-2.4.67-7 49041c3 from git://anongit.freedesktop.org/mesa/drm
mesa: mesa-11.1.2 7bcd827 from git://anongit.freedesktop.org/mesa/mesa
git://anongit.freedesktop.org/cairo 
cairo: 1.15.2 db8a7f1 from git://anongit.freedesktop.org/cairo
waffle: bb29b2a from git://github.com/waffle-gl/waffle
util-macros-1.19.0-2 d7acec2 from
git://git.freedesktop.org/git/xorg/util/macros
xorg-server-1.18.1 23e60f9 from git://git.freedesktop.org/git/xorg/xserver
xf86-video-intel 2.99.917-560 d167280 from
git://anongit.freedesktop.org/xorg/driver/xf86-video-intel
libva-1.7.0.pre1 35f1447 from git://git.freedesktop.org/git/vaapi/libva
vaapi-intel-driver 1.7.0.pre1 ab8e4e3 from
git://anongit.freedesktop.org/vaapi/intel-driver
DMC 1.4 from: https://01.org/linuxgraphics/intel-linux-graphics-firmwares
intel-gpu-tools-1.14 c19b049 from
http://anongit.freedesktop.org/git/xorg/app/intel-gpu-tools.git

Steps:
------
1. Boot in text mode
2. Execute some basic commands like change directory with tabulation

Actual result:
--------------
2. Keyboard input needs delay and auto-completion needs sometimes 2 seconds

Expected result:
----------------
2. Console respond normally

Info
----
We have abnormal numbers of failures in IGT (150 regressions), some basic tests
frequently fails when executed in a loop
Reproduced via ssh (login timeouts or needs also delay)
Not reproduced with kernel boot command line: acpi=off

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