[Openchrome-devel] [Bug 97387] Wyse Cx0 No display on DVI with DVI+VGA "Y" adapter.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97387

--- Comment #13 from Kevin Brace <kevinbrace at gmx.com> ---
Hi Eric,

This is my best current understanding of how DVI-I connector works.
DVI-I has both DVI signals and analog VGA signals.
However, it has only one I2C bus.
Within OpenChrome, when an EDID is obtained from the monitor, the code looks
for whether or not the returned EDID is an analog type or digital type.
If an analog type is returned, it is safe to assume analog VGA presence.
However, if a digital type EDID is returned, it is a little tricky since a
digital type EDID can be an LVDS flat panel. (i.e., laptop LCD monitor, not the
typical desktop LCD monitor) or DVI.
    For now, I discontinued the use of I2C bus for LVDS flat panel due to
conflicts with DVI code.
The LVDS flat panel code is now 100% dependent on BIOS based interface to tell
OpenChrome the panel resolution.
I do not necessarily like this implementation, but it is what I have now.
Some LVDS flat panel do not have an I2C bus coming out of it.
I recently updated the flat panel screen resolution table due to this LVDS flat
panel and DVI conflict issue.

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