[Bug 69128] [IVB dp dongle] Apple miniDP-to-VGA fails link training

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=69128

Qingshuai Tian <qingshuai.tian at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW

--- Comment #15 from Qingshuai Tian <qingshuai.tian at intel.com> ---
(In reply to comment #14)

> As for the EDID issue: despite the error message the modeset seems to
> succeed using a default mode; is the display on or blank for you?

The display is on. It  work normally even when boot up with the error message.

> Could you check if your VGA cable is DDC-2 compatible? There are cables out
> there without pin 9,12,15 properly wired and with those you won't be able to
> read the EDID. You can check this by using the cable on another machine and
> checking with xrandr if all the modes supported by the display are listed.

I plugged the cable on another machine and get the information with xrandr:

 VGA1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 509mm
x 286mm
   1920x1080      60.0*+
   1680x1050      60.0
   1280x1024      75.0     60.0
   1440x900       75.0     59.9
   1280x960       60.0
   1152x864       75.0
   1280x720       60.0
   1024x768       75.1     70.1     60.0
   832x624        74.6
   800x600        72.2     75.0     60.3     56.2
   640x480        75.0     72.8     66.7     60.0
   720x400        70.1 

But sorry that I'm not sure how to confirm whether all the modes of the display
are listed or not. I hope to hear from you. Thanks :)

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