[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 #28 from Paulo Zanoni <przanoni at gmail.com> ---
(In reply to comment #21)
> Created attachment 97934 [details]
> 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)

Please also provide the output of intel_reg_dumper for this case.

Thanks,
Paulo

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