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

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Sun Feb 21 21:54:38 UTC 2016


Kevin Brace <kevinbrace at gmx.com> changed:

           What    |Removed                     |Added
 Attachment #121871|0                           |1
        is obsolete|                            |

--- Comment #198 from Kevin Brace <kevinbrace at gmx.com> ---
Created attachment 121872
  --> https://bugs.freedesktop.org/attachment.cgi?id=121872&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>
Signed-off-by: Kevin Brace <kevinbrace at gmx.com>

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