[Bug 91599] New: [BSW] Regression - Black screen when booting - aux not responding

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91599

            Bug ID: 91599
           Summary: [BSW] Regression - Black screen when booting - aux not
                    responding
           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

Platform: Braswell M
Hardware
CPU : Intel(R) CPU  @ 1.52 GHz (family: 6, model: 76 stepping: 3)
SoC : BSW C0
CRB : BRASWELL RVP Fab2
Mandatory Reworks : All
Feature Reworks: F28, F32,F33 & F37
Optional reworks : O-01a

Software
BIOS : BRAS.X64.B074.R00.1505311952
TXE FW : 2.0.0.2064
Ksc : 1.08
Linux distribution: Ubuntu 14.04 LTS 64 bits
Kernel : drm-intel-nightly 308b72e08b237aa7cde758fc44f88851710e417d 4.2.0-rc5
from git://anongit.freedesktop.org/drm-intel
Mesa: mesa-10.6.3 ddc976368fef367e464472ebcc2ac4fd89eb9fd8 from
http://cgit.freedesktop.org/mesa/mesa/
Xf86_video_intel: 2.99.917 baec802b21387d04aebb10ac29e719a1800c5aa0 from
http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/
Libdrm: libdrm-2.4.62 ba4b5ac010ab85406ec52e3906e13d58cd9aa782 from
http://cgit.freedesktop.org/mesa/drm/
Cairo: 1.14.2 from 93422b3cb5e0ef8104b8194c8873124ce2f5ea2d
http://cgit.freedesktop.org/cairo
libva: libva-1.6.0 a8008998bc0d4a76ae6927607c048e52ba50fd0e from
http://cgit.freedesktop.org/libva/
intel-driver: 1.6.0 32268c46d538667d437dc9266aa4c183e51c1286 from
http://cgit.freedesktop.org/vaapi/intel-driver
Xserver: xorg-server-1.17.2 2123f7682d522619f101b05fb75efa75dabbe371 from
http://cgit.freedesktop.org/xorg/xserver 

Kernel commit log:
commit 308b72e08b237aa7cde758fc44f88851710e417d
Author: Daniel Vetter
Date: Fri Aug 7 19:09:47 2015 +0200
drm-intel-nightly: 2015y-08m-07d-17h-08m-56s UTC integration manifest

Preconditions:
--------------
No special kernel boot options

Steps:
-------
1. Boot

Actual result:
--------------
1. Ubuntu login screen appears 1 second. Then screen is black.

Expected result:
----------------
1. Screen stays on

Info
------
Works with external HDMI screen

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