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

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91966

--- Comment #280 from Kevin Brace <kevinbrace at gmx.com> ---
Hi Christopher,

Another thing I wanted to say is, I am cautiously optimistic that if you
compile the latest OpenChrome code in the repository in Ubuntu 14.04 or similar
environment (i.e., Xubuntu 14.04, etc.), and transfer it the way I wrote down
the instruction a few comments ago to Tahrpup version of Puppy Linux, it will
likely work, at least if you limit the use to VGA via DVI to VGA adapter.
That being said, I am currently trying to integrate improved standby resume
code that is not really related to this bug (This was being worked on prior to
the bug report you filed.).
    After that, I plan to do a major rewriting of the display detection code.
The thing is, the previous developers (This appears to be a sensitive issue to
the previous developers.) appeared to not have been using what is known as
"strapping" settings to aid the display detection.
This is somewhat documented in several public documents I have obtain legally,
but it somewhat buried in the documents, so if one is not paying attention, one
might miss it.
What this "strapping" thing is that it is a simple resistor array that allows
the chip to obtain bare minimum information about the chip at system power up.
A few pins are used to tell the chip what screen resolution is the native
screen resolution of the flat panel.
Currently, at least for flat panel detection, the code is reading back the CRTC
(CRT Controller; "CRT" == that old "tube" we all used until about 10 years ago)
settings that directly handles screen resolution, and this is probably a very
bad practice.
This is the reason why the screen detection is somewhat weird at the moment
since the last couple of commits I have made.
In the process of getting rid of the code "rot," I happened to break the code.

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