[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 #14 from John Friend <cepb13 at live.com> ---
(In reply to Kevin Brace from comment #9)

Hi Kevin,

I have already tested two different crt monitors with two different DVI-VGA
adapters. Please also note that very same monitor supplies EDID data to same
openchrome-0.4.0 driver when connected to VGA port of CLE266/CN700/VX800
devices as seen on my previous logs. Yet I have tested a third monitor today
(Philips 107E) on T5540(VX800) and T5550(VX900) and I will send the logs
shortly. 

I understand that CRT and LCD are same regarding detection. Then maybe LCD
monitors behave better on providing EDID data simply because they are never
products than CRT monitors. 

I have also tried applying a patch to openchrome-0.4.0 just like Benno did
previously at Bug 94277 and I am able to get image on same VGA moitor connected
to DVI port of T5550. Sure its not getting any EDID data by this way, but
blindly setting some modes as via-opensource driver did. I will send the patch
and log files shortly.

What I understand so far is, there is some shortcomings in getting EDID data
from (some) VGA devices connected to DVI port of VX900 (or maybe any DVI port
in general). So, IMHO, it may be better to implement a mechanism to fallback to
default modes and let the user set other modes in xorg.conf rather than trying
to get EDID data from any and all monitors. At this point, it will be a good
practice to support as much resolutions as possible in fallback. Because
although one of my monitors (not the ones I have sent the logs) supports
1600x1200, I can get upto 1280x1024 by via-opensource driver and upto 1024x768
by modified openchrome-0.4.0 driver as they provide only upto these
resolutions. 

John

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