[Openchrome-devel] [Bug 94277] driver does not detect VGA monitor, but there is one

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Thu Feb 25 00:56:58 UTC 2016


--- Comment #2 from Kevin Brace <kevinbrace at gmx.com> ---
Created attachment 121955
  --> https://bugs.freedesktop.org/attachment.cgi?id=121955&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).

Reported-by: Christopher <laserhawk64 at gmail.com>
Tested-by: Justin Chevrier <jchevrier at gmail.com>
Signed-off-by: Kevin Brace <kevinbrace at gmx.com>

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