[Bug 76711] [BDW Regression] blank screen on eDP with 38aecea0

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76711

--- Comment #21 from Guo Jinxian <jinxianx.guo at intel.com> ---
Created attachment 97934
  --> https://bugs.freedesktop.org/attachment.cgi?id=97934&action=edit
dmesg

On latest -nightly(7fa20daad840000b56924136d02a8d33265f29ca) reverted
(38aecea0ccbb909d635619cba22f1891e589b434), then patched [PATCH 1/2] drm/i915:
clean up VBT eDP link param decoding and [PATCH 2/2] drm/i915: use lane count
and link rate from VBT as minimums for eDP, 3200x1800 eDP still shows
blackscreen. Please check the dmesg with "drm.debug=0xe". Thanks.

[root at x-bdw07 tests]# xrandr
Screen 0: minimum 8 x 8, current 3200 x 1800, maximum 32767 x 32767
eDP1 connected 3200x1800+0+0 (normal left inverted right x axis y axis) 293mm x
165mm
   3200x1800     60.00*+  51.60
   2048x1536     60.00
   1920x1440     60.00
   1856x1392     60.01
   1792x1344     60.01
   1600x1200     60.00
   1400x1050     59.98
   1280x1024     60.02
   1280x960      60.00
   1024x768      60.00
   800x600       60.32    56.25
   640x480       59.94
DP1 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)

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