[Bug 96551] New: VGA black screen

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=96551

            Bug ID: 96551
           Summary: VGA black screen
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.14.33
          Hardware: Intel
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: saiveny at yahoo.com.tw
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

Created attachment 173801
  --> https://bugzilla.kernel.org/attachment.cgi?id=173801&action=edit
dmesg log

I have a issue with VGA black screen but mouse cursor exists when switch
Display to VGA only.

    Environment :
        CPU : Intel(R) Celeron(R) CPU N2807 @ 1.58GHz
        OS : Base on Ubuntu 14.04
        kernel version : 3.14.33
        xserver-xorg-video-intel : 2:2.99.911
        Display : A LCD panel(xrandr name is eDP1) and a VGA port (xrandr name
is VGA1)

    Test Step :
     1. Open Terminal(Default output is LCD panel)
     2.Type command : 
            xrandr --output eDP1 --off --output VGA1 --mode 1920x1080
        Switch display to VGA only
     3.Type command :
            xrandr --output eDP1 --mode 1366x768 --output VGA1 --off
        Switch display to LCD panel only
     4.Repeat Step2 and Step3, sometimes, it cause VGA black screen but mouse
cursor exists when using Step 2 command.
        The failure rate is 7/10

    Is there a way to resolve this issue?

Thanks.

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