Issue with Nitrogten6x_MAX DVI Output

stevenlopes — Tue, 29 Mar 2016 18:53:28 GMT

I'm having an issue with the output of the Nitrogten6x_MAX board, specifically using a HDMI to DVI cable.

I worked through a few issues in the kernel and have made some headway, but I am stuck with one last problem. Every once in a while, and sometimes very consistently, the screen will output red or blue vertical lines overlaying the desktop. This does not happen with every output device I plug into it, but on some it is very consistent. The lines are usually a few pixels thick and sparkle on the right side (meaning the pixels are solid on the left but random on the right of the lines).

If I unplug the cable and plug it back in, everything is fine, until I boot up again.

I am hooking up to some DVI output boards which are rated to take 1024x768 @ 60hz and work great on a windows PC. I have rewritten part of the kernel to specifically set itself to 1024x768 @ 60hz if that mode is identified in the EDID chip and 1920x1080 @ 60hz is not identified.

I have tried changing the frequency down to 30hz and back up to 50, 55, 57, 59, 59.94, 60, and 61. No real change. I notice there is a difference when using a single-link and a double-link cable, but both will produce the problem.

Has anyone dealt with this in the past or does anyone have any input on how to fix it?

Thank you!

Re: Issue with Nitrogten6x_MAX DVI Output

igorpadykov — Wed, 30 Mar 2016 01:28:04 GMT

Hi Steven

if you have hdmi enabled in u-boot one can try to disable HDMI in u-boot and

let Linux initialize it:

https://bugzilla.yoctoproject.org/show_bug.cgi?id=6703

DVI on boundary devices is decribed on:

http://boundarydevices.com/dvi-support-on-i-mx6-boards

Also preferable option is to use true HDMI monitor, in addition to DVI

signals HDMI provides control lines (I2C) for configuring, audio, hot plugging.

Best regards

igor

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Issue with Nitrogten6x_MAX DVI Output

Re: Issue with Nitrogten6x_MAX DVI Output