[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
Tue Feb 23 03:43:11 UTC 2016


--- Comment #209 from Kevin Brace <kevinbrace at gmx.com> ---
Hi Christopher and Justin,

This is what the description portion of the commit will look like.
If you do not want your name to appear in the commit message, let me know and I
will remove it before making the commit.

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
    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>

I will wait until both of you sign off or want to opt out.
After the commit is made, I will make a patch activating VX900 chipset's
integrated transmitters.

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