[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 #11 from HuangRan <huangranbj at 126.com> ---
Hi John,

  Yup, it seems T510 is relative newer than T5550 with your links. Yesterday, I
have purchased two sets of T5550 thin clients. After I receive it in next few
days, I can give a test to help you verify at my side if this issue has not
been solved yet at that time. And then, I can give a debug to see what happens.
  I went through this thread including what Kevin and Benno talked about below,
my opinion is that besides Justin helped you try a crt monitor next week, you
can give a try with another CRT/LCD monitor with a VGA port on your T5550
platform as Kevin suggested if that is possible. That can narrow down where the
root cause is. Actually Kevin is correct, whatever it is a CRT or LCD monitor,
the EDID information should be probed out by the same I2C bus(i.e, i2c bus2) if
you are using the same board. And in general, the graphics driver will use this
EDID information to generate several modelines for users to choose(sometimes,
modeline prune will be done before real mode setting is happening, i.e., in KMS
driver).

Hi Kevin,

   I also suggested to add some code as Friend/Benno suggested if the EDID
probe is failed for some uncertain reason like this. As I have done before, if
there is no EDID probed out, the user can use a xorg.conf or a registry
file(like Windows CE) to add a mode which the user wants to support, and then
the graphics driver can use this mode to do the mode setting and make
everything work. At least, it can make the graphics mode work although it is
not using detected EDID information and will not frustrate users if the monitor
is black and shows nothing on that.

Thanks,
Frank


(In reply to John Friend from comment #6)
> (In reply to HuangRan from comment #1)
> Hi Frank 
> 
> T510 seems to me as newer version of T5550. I found below links for them.
> Both have same I/O ports and very similar (if not same) lspci output. But
> certainly not same mainboard. 
> 
> http://www.parkytowers.me.uk/thin/hp/t510
> http://www.parkytowers.me.uk/thin/hp/t5570 (T5570 said to be actually T5550
> w/ Windows Embedded)
> 
> As I mentioned on my reply to your message at bug 91966, what I wonder is if
> anybody else tested 0.4.0 with crt monitor. AFAIK, Justin Chevrier also owns
> a T5550 and sent xorg.log files for successful tests of VGA connected to DVI
> but I think he is also testing it with LCD. 
> 
> John

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