[Gumstix-users] HDMI noise with Overo FireSTORM / Tobi / GNOME daily build

[David Diel]

I have a problem with some serious HDMI noise from the Overo FireSTORM /
Tobi expansion board, illustrated by the following image:

Loading Image...

I loaded a 16GB Class 10 MicroSD card with the Sakoman GNOME daily
build, booted several times at different resolutions, tried different
HDMI cables, connected to different monitors, and I've still got random
streaking and discoloration.

Can anyone tell me whether this is a hardware or software problem?

[Blaine Booher]

Since HDMI is a digital signal, this would imply that signal on your line
would cause a scrambled image. That means that the noise isn't coming in
from the hdmi signal itself... it's either being fuzzed at the connector
end after digital to analog translation, or the noise is being converted
before the hdmi signal is being generated, and then sent to the monitor
entirely...

Hmm. That's tricky. I'm curious to see where this goes.

Sincerely,
Blaine Booher
Clifton Labs, Inc
(513)-400-5606 (work)
(937)-570-9336 (cell)

Post by David Diel
I have a problem with some serious HDMI noise from the Overo FireSTORM /
http://picturestack.com/544/757/RoMphotogID.jpg
I loaded a 16GB Class 10 MicroSD card with the Sakoman GNOME daily
build, booted several times at different resolutions, tried different
HDMI cables, connected to different monitors, and I've still got random
streaking and discoloration.
Can anyone tell me whether this is a hardware or software problem?
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[David Diel]

To clarify a couple of issues:

The GNOME build is version r13, Linux version 3.0.0.
The boards were delivered two days ago directly from Gumstix.
The monitor used for the illustration was a HDTV.
The screen appeared blank when connected to a different monitor's DVI-D
input.
Changing HDMI cables had no effect.

Post by Blaine Booher
Since HDMI is a digital signal, this would imply that signal on your
line would cause a scrambled image. That means that the noise isn't
coming in from the hdmi signal itself... it's either being fuzzed at
the connector end after digital to analog translation, or the noise is
being converted before the hdmi signal is being generated, and then
sent to the monitor entirely...
Hmm. That's tricky. I'm curious to see where this goes.
Sincerely,
Blaine Booher
Clifton Labs, Inc
(513)-400-5606 (work)
(937)-570-9336 (cell)
I have a problem with some serious HDMI noise from the Overo FireSTORM /
http://picturestack.com/544/757/RoMphotogID.jpg
I loaded a 16GB Class 10 MicroSD card with the Sakoman GNOME daily
build, booted several times at different resolutions, tried different
HDMI cables, connected to different monitors, and I've still got random
streaking and discoloration.
Can anyone tell me whether this is a hardware or software problem?
------------------------------------------------------------------------------
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and
threat landscape has changed and how IT managers can respond. Discussions
will include endpoint security, mobile security and the latest in malware
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
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[Jason C. Mecham]

[David Diel]

I tested right out-of-the-box with the default Sakoman image for overo
gnome r13. I don't see any obvious problems with the soldiering job,
except maybe that L1 looks skewed maybe 5 degrees. I've ordered a second
set of boards, so I'll find out next week whether this is an anomaly.


On 04/27/2012 03:25 PM, Jason C. Mecham wrote:

[David Diel]

We ordered a new set of boards, and they work perfectly well. So, this
was a hardware problem, and we will be sending back the first set.

Post by David Diel
The GNOME build is version r13, Linux version 3.0.0.
The boards were delivered two days ago directly from Gumstix.
The monitor used for the illustration was a HDTV.
The screen appeared blank when connected to a different monitor's
DVI-D input.
Changing HDMI cables had no effect.

Post by Blaine Booher
Since HDMI is a digital signal, this would imply that signal on your
line would cause a scrambled image. That means that the noise isn't
coming in from the hdmi signal itself... it's either being fuzzed at
the connector end after digital to analog translation, or the noise
is being converted before the hdmi signal is being generated, and
then sent to the monitor entirely...
Hmm. That's tricky. I'm curious to see where this goes.
Sincerely,
Blaine Booher
Clifton Labs, Inc
(513)-400-5606 (work)
(937)-570-9336 (cell)
I have a problem with some serious HDMI noise from the Overo FireSTORM /
http://picturestack.com/544/757/RoMphotogID.jpg
I loaded a 16GB Class 10 MicroSD card with the Sakoman GNOME daily
build, booted several times at different resolutions, tried different
HDMI cables, connected to different monitors, and I've still got random
streaking and discoloration.
Can anyone tell me whether this is a hardware or software problem?
------------------------------------------------------------------------------
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and
threat landscape has changed and how IT managers can respond. Discussions
will include endpoint security, mobile security and the latest in malware
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
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gumstix-users mailing list
https://lists.sourceforge.net/lists/listinfo/gumstix-users