[Bug 72834] [BDW]DP monitor unable to detected by hot-plug

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72834

--- Comment #3 from Guo Jinxian <jinxianx.guo at intel.com> ---
(In reply to comment #1)
> What happens when you manually run xrandr in the failing case? Do we detect
> a monitor (i.e. is only the hotplug event not working) or do we completely
> fail to detect the screen?

The DP is able to detect by xrandr, but the monitor shows "There is no signal
coming from your computer". 

[root at x-bdw01 ~]# xrandr
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 32767 x 32767
eDP1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 282mm x
165mm
   1920x1080      60.0*+   40.0
   1400x1050      60.0
   1280x1024      60.0
   1280x960       60.0
   1024x768       60.0
   800x600        60.3     56.2
   640x480        59.9
DP1 connected (normal left inverted right x axis y axis)
   2560x1600      60.0 +
   1920x1440      60.0
   1920x1200      59.9
   1920x1080      60.0     50.0     59.9     24.0     24.0
   1920x1080i     60.1     50.0     60.0
   1600x1200      60.0
   1280x1024      75.0     60.0
   1280x800       59.8
   1152x864       75.0
   1280x720       60.0     50.0     59.9
   1024x768       75.1     60.0
   800x600        75.0     60.3
   720x576        50.0
   720x480        60.0     59.9
   640x480        75.0     60.0     59.9
   720x400        70.1
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
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