[Openchrome-devel] [Bug 94863] No signal at VGA (crt-tube) connected to DVI port of VX900

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Fri Apr 8 03:47:01 UTC 2016


https://bugs.freedesktop.org/show_bug.cgi?id=94863

--- Comment #3 from Kevin Brace <kevinbrace at gmx.com> ---
I looked at the Xorg.0.log Frank has uploaded.
It appears that in his HP T510 thin client, I2C bus used to obtain EDID
(Extended Display Identification Data) is what OpenChrome calls I2C bus 2.
This was the bug I fixed with Bug 91966 (The bug is still open, but hopefully
it will close when the original filer confirms the fix. At least I have
confirmed the fix with Puppy Linux 5.7.1.).
EDID is used to provide the computer side the monitor's capabilities like
screen resolutions it supports.
It has been supported by most monitors since year 1995 or so.
The way OpenChrome is currently written pretty much requires the use of EDID to
probe the presence of a VGA monitor (CRT or LCD type does not really matter as
long as the interface is VGA).
Yes, OpenChrome does have a last resort backup that will do what I call "manual
detection," but I do not believe this ever works.
Perhaps, the code can be removed for now since it does not appear to work (the
code has been there for a while).
Justin Chevrier who also owns HP T5550 also uploaded his Xorg.0.log, and his
unit was detecting the presence of a VGA monitor via I2C bus 2.

https://bugs.freedesktop.org/attachment.cgi?id=122295
https://bugs.freedesktop.org/attachment.cgi?id=122295&action=edit

-- 
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/openchrome-devel/attachments/20160408/cb700966/attachment.html>


More information about the Openchrome-devel mailing list