[Bug 58561] New: the external screen will become white and show nothing when switch screen to clone mode or external VGA only

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=58561

          Priority: medium
            Bug ID: 58561
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: the external screen will become white and show nothing
                    when switch screen to clone mode or external VGA only
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: evawang at linpus.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 71843
  --> https://bugs.freedesktop.org/attachment.cgi?id=71843&action=edit
intel_haswell_hotplug_vga_external_white_screen.log

When switch screen to clone mode(LCD+external VGA/HDMI) or external
mode(VGA/HDMI only) using the following command, the external screen will
become white and show nothing. attached log is error code. This only happens on
Lenovo Yx10 Sharkbay platform, Ivy bridge is OK.

         Clone mode(LCD+external VGA): xrandr --output eDP1 --mode 1024x768
--output VGA1 --mode 1024x768(the shared resolution ratio of eDP and VGA)
         External mode(VGA only): xrandr --output eDP1 --off --output VGA1
--mode 1366x768(the highest resolution ratio, it is different on different
computer)

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