[Bug 100553] Linux drivers for Intel-Braswell N3000 not detecting displays correctly

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Mon Apr 17 18:08:02 UTC 2017


https://bugs.freedesktop.org/show_bug.cgi?id=100553

--- Comment #3 from Marek Wilczewski <mw at 3cte.pl> ---
We have verified suggested kernel - no change. 
After digging - problem is related to i915 DRM driver.

This driver is using "platform default" DDC bus mappings that is valid for CRB,
and unlikely usefull for many other systems. VBT configuration is not used for
some reason.

I've modified driver to use DDC mappings as on our platform - HDMI is detected
now. 

Default configuration from CRB - pipe B using DDC-B will not work correctly on
most systems with LFP - usually LFP will be eDP, and external display (pipe C)
will be using DDC-B - such configuration is also used on another intel ref.
design with Braswell. 

//Marek.

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