[Bug 90228] New: [BSW] hotplug events floods

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90228

            Bug ID: 90228
           Summary: [BSW] hotplug events floods
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: jeff.zheng at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 115429
  --> https://bugs.freedesktop.org/attachment.cgi?id=115429&action=edit
dmesg log

==System Environment==
--------------------------
HDMI monitor: ASUS VS239HR
BIOS: V59 
Regression: No. This issue happens with V49 BIOS.

Non-working platforms: BSW

==kernel==
--------------------------
-testing: drm-intel-testing-2015-04-23 (fails)

==Bug detailed description==
-----------------------------
After system boots, dmesg shows floods of hotplug events:

[    2.430657] [drm:intel_hpd_irq_handler] hotplug event received, stat
0x00000040, dig 0x00000000
[    2.431178] [drm:intel_hpd_irq_handler] hotplug event received, stat
0x00000040, dig 0x00000000
[    2.431718] [drm:intel_hpd_irq_handler] hotplug event received, stat
0x00000040, dig 0x00000000
......

I first saw this issue since the BIOS upgraded to V49, not sure it's a BIOS
issue or kernel issue. Submit this issue for reference.

==Reproduce steps==
---------------------------- 
1. boot BSW
2. dmesg |grep hotplug
[    2.430657] [drm:intel_hpd_irq_handler] hotplug event received, stat
0x00000040, dig 0x00000000
......

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