[Openchrome-devel] [Bug 91966] No signal to monitor with X and openchrome using VX855 chipset graphics

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91966

Kevin Brace <kevinbrace at gmx.com> changed:

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--- Comment #196 from Kevin Brace <kevinbrace at gmx.com> ---
Created attachment 121871
  --> https://bugs.freedesktop.org/attachment.cgi?id=121871&action=edit
Using I2C bus 2 to detect a VGA monitor

Previously, it was assumed that only I2C bus 1 is used to detect a VGA
monitor. I2C bus 2 is typically used to detect a DVI monitor via a DVI
connector. However, for devices with a DVI-I connector, VGA signals come
out of the connector as well. What this means is that I2C bus 2 also has
to be used to detect a VGA monitor, in addition to I2C bus 1. Furthermore,
EDID obtained from the monitor via I2C bus will be used to determine whether
or not it is an analog type (i.e., VGA monitor).

Signed-off-by: Kevin Brace <kevinbrace at gmx.com>

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