[Bug 89456] New: [BYT-M]Switching console after X is started will cause X issue.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89456

            Bug ID: 89456
           Summary: [BYT-M]Switching console after X is started will cause
                    X issue.
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: hengx.ding at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 114067
  --> https://bugs.freedesktop.org/attachment.cgi?id=114067&action=edit
dmesg

==System Environment==
--------------------------
Non-working platforms: BYT-M
Regression :No, this issue exist before.
==kernel==
--------------------------
origin/drm-intel-testing: 820fa21889d702c70c82e30342154624c7139bb3(2015-02-28) 


==Bug detailed description==
-----------------------------

run xinit and switch console with Ctrl+fn+alt+F2, then switch back with alt+F1,
you will see the message below. And seems the xinit is not running.

root at x-bytm02:~# xinit


X.Org X Server 1.17.99
Release Date: 2015-02-02
X Protocol Version 11, Revision 0
Build Operating System: Linux 3.19.0-rc7+ x86_64
Current Operating System: Linux x-bytm02
3.19.0-rc6_drm-intel-testing-2015-01-30+ #18 SMP Sun Feb 1 20:44:36 EST 2015
x86_64
Kernel command line:
BOOT_IMAGE=kernels//drm-intel-testing/drm-intel-testing-2015_01_30/bzImage_x86_64
root=/dev/sda8 drm.debug=0xe hostname=x-bytm02
modules_path=kernels//drm-intel-testing/drm-intel-testing-2015_01_30/modules_x86_64/lib/modules/3.19.0-rc6_drm-intel-testing-2015-01-30+
acpi_rsdp=0x78c8c014 kexec_jump_back_entry=0x76b74747
Build Date: 04 March 2015  12:37:14PM

Current version of pixman: 0.33.1
        Before reporting problems, check http://wiki.x.org
        to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
        (++) from command line, (!!) notice, (II) informational,
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/opt/X11R7/var/log/Xorg.0.log", Time: Fri Mar  6 05:49:03 2015
(==) Using system config directory "/opt/X11R7/share/X11/xorg.conf.d"
xterm: cannot load font
'-misc-fixed-medium-r-semicondensed--13-120-75-75-c-60-iso10646-1'
(II) AIGLX: Suspending AIGLX clients for VT switch


==Reproduce steps==
---------------------------- 
1. xinit
2. press Ctrl+fn+alt+F2, then press Alt+F1.

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