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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #9 from Kevin Brace <kevinbrace at gmx.com> ---
Hi John,

I will reply to your message maybe tomorrow, but looking at the 2 logs you have
attached for VX900 chipset, I must say that there seems to be something weird
about your particular unit.
This is because let's assume that OpenChrome is buggy, but VIA Technologies in
house device driver is working properly.
I2C bus is typically used as the first option for display detection, including
VGA monitors (CRT or LCD does not really matter).
When I read VIA Technologies in house device driver log, it appears that it is
also not seeing your VGA monitor via I2C bus, hence, it is resorting to the use
of what you called a "fake" monitor information.
Actually, this type of situation does happen, and I recently had another person
file a bug report similar to your situation (Bug 94277).
Personally, it will be nice if you can attach a different monitor with VGA
interface to this unit to see what it does.
Regarding the monitor type, CRT or LCD does not matter to OpenChrome since EDID
that comes from any VGA interface will always identify as an analog type
interface (and this also assumes that it is working properly in the first
place), and this is used by other Linux device drivers to detect a VGA
interface as well.
If you are able to borrow another monitor (CRT or LCD) with a VGA interface,
you may want to attach that to see if OpenChrome will recognize the monitor or
not.
If not, I think there is a high probability that there is a problem with the
unit.
Another possibility can be hardware level incompatibility, but I will not want
to go there for now.
I do know people do think that OpenChrome is suspect, and that is not a bad
assumption considering that bugs have multiplied over the years without much
repairs being done until now.
However, even the better quality VIA device driver (They do have in house help
in writing the device driver from the hardware design side. That's a huge
advantage they have over the previous OpenChrome developers and me.) is not
detecting your VGA monitor, and I find that concerning.

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