[Bug 75061] New: System boot failure very often

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=75061

            Bug ID: 75061
           Summary: System boot failure very often
           Product: Drivers
           Version: 2.5
    Kernel Version: x86_64
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: yuking_net@sohu.com
        Regression: No

Created attachment 134221
  --> https://bugzilla.kernel.org/attachment.cgi?id=134221&action=edit
dmesg after one normal bootup

My video card is HD6850, motherboard is ASUS P8Z68-LE.

System can not boot up with radeon module very often. After powerup, the screen
always goes blank, no any information, and it will not reboot immediately after
pressing the reset button ( Reboot  occurs  10 or 15s later). System will boot
up after pressing the reset button 2, 3, or even 7 times. And the whole system
crashes very often after boot up normally, too. 
The system log has no any failure information after several  boot failures.
Version 3.13~3.15 or earlier versions have the same problem.
Any idea about it? 

P. S. Windows works very well.

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