[Openchrome-devel] [Bug 95059] DVI port failure with external TMDS transimitter for T510/T5555/C90LE thin clients

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Sat May 28 08:04:49 UTC 2016


--- Comment #7 from Kevin Brace <kevinbrace at gmx.com> ---
(In reply to frank from comment #6)

Hi Frank,

> Created attachment 124119 [details]
> Xorg.0.log of V90LE with UMS 0.4.0
> hi,I tried ums0.4.0 in V90LE with DVI port,it can't work,from the
> Xorg.0.log,it seems dvi port can't get the edid data correctly,and I found
> that in the source code of ddx,the dvi init function has been commented
> out(ViaOutputsDetect function in via_outputs.c),so I tried to uncomment
> it,then the edid can be read as in the attachments,but the display still
> can't work,so my question is that why comment out the via_dvi_init
> function,and this function seems just point at vt1632a transmiter,so if the
> board has no vt1632,how to init the dvi port?
> hope to get the answer.

There is a very simple reason why the code that initializes an external TMDS
transmitter (i.e., the code that looks for VT1632A via I2C bus) is currently
I simply could not get it to work, so I had to disable it for now.


If you noticed it, the next commit I made after the above one was the release
of Version 0.4.0.


The real reasons behind disabling the code that deals with an external TMDS
transmitter are the following.
Some people needed a newer version of OpenChrome to be bundled with their Linux
distributions ASAP (as soon as possible) due to a bug in the previous version
(Version 0.3.3) that affect devices that are not registered with a "known
device table."


Also, I have been working on trying to improve OpenChrome since July 2015, and
I just wanted to release a new version since fixing all the bugs will probably
take years.
The development process was becoming stressful, and I needed to ship something
because I was getting fatigued working on this project.
I am okay now, and I continue to work on fixing the code.
    I will give you more technical explanations as to why DVI via VT1632A is
not working yet in another post.

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