[Bug 89704] [byt dsi] No image on WinBook TW700 tablet's DSI display after DRM initializes

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89704

--- Comment #30 from zeng.shixin at gmail.com ---
Even when I can't see the screen, I can _blindly_ log in and start Xserver, and
even run xrandr:

[zsx at winbook7 ~]$ xrandr --display :0
Screen 0: minimum 8 x 8, current 800 x 1280, maximum 32767 x 32767
DSI1 connected 800x1280+0+0 (normal left inverted right x axis y axis) 0mm x
0mm
   800x1280      60.00*+
   800x600       60.32    56.25  
   640x480       59.94  
   400x640       60.00  
DP1 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
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)

However, screen is still blank (not completely black, but glooming).

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