[Bug 79004] New: [BDW]the monitor cannot display X window after running command "xinit"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79004

          Priority: medium
            Bug ID: 79004
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BDW]the monitor cannot display X window after running
                    command "xinit"
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: zhixinx.liu at intel.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

after running command "xinit &" to start X window, system should display X
window on the monitor automatically.
notes:
    1. not all BDW machine can reproduce this issue.
    2. if this issue arise, even uses older kernel and older X11R7, it also can
be reproduced.
    (for example: kernel:20140227_nightly and X11R7:20140227_stable)

1. Testing Env:
========================================================================
kernel:    3.15.0-rc5_drm-intel-fixes_4ba480_20140521
X11R7:    X11R7.stable.2014-05-20.tar.gz

2. Testing Steps:
========================================================================
    1.boot up system
    2.running cmd "xinit &" to start X window
    3.check the the monitor, the X windows cannot display
    workround:
        1.after running "xinit &", run command "ps aux |grep X" to check which
tty are using by X(for example:tty2 )
        2.run command "chvt 2"
        3.check the the monitor, the X windows can display now.

3. Debug Information:
    (gdb) bt
    #0  0x000000372f0ebfb7 in ioctl () from /usr/lib64/libc.so.6
    #1  0x00000000004b4a99 in switch_to (vt=2,
     from=from at entry=0x5c07b1 "xf86OpenConsole") at lnx_init.c:74
    #2  0x00000000004b4e60 in xf86OpenConsole () at lnx_init.c:197
    #3  0x0000000000490a9f in InitOutput (
     pScreenInfo=pScreenInfo at entry=0x82a880 <screenInfo>, argc=argc at entry=2,
     argv=argv at entry=0x7fffca1e40e8) at xf86Init.c:552
    #4  0x000000000043cf0d in dix_main (argc=2, argv=<optimized out>,
     envp=<optimized out>) at main.c:200
    #5  0x000000372f021b75 in __libc_start_main () from /usr/lib64/libc.so.6
    #6  0x00000000004277e1 in _start ()

3. Frequency of Occurence:
========================================================================
machine 1：Test 5 times, and this issue arise 4 times.
machine 2：cannot reproduce this issue.

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