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[solved] OrangePiPC+ HDMI problem with resolution 1024x768


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Hello, I have following issue with HDMI resolution 1024x768.
As soon as kernel starts loading, little light-green box 6x4px appears at the bottom-left corner of the screen and never goes away.
The box always stays on top of everything including mouse pointer and vdpau-accelerated video, not visible on screenshots.

 

Also HDMI sound is full of clicks in this resolution only.
Other resolutions are ok.

 

Seems that there is no problem with DVI 1024x768 (entire screen is greenish when connected by HDMI but i see that mouse pointer is visible in that area).

 

First seen this on TV 42PC1RR which has native resolution 1024x768, also reproduced on fullhd monitor S24D390 in 1024x768 mode. Both screens work fine with other 1024x768 sources with same HDMI cables.

 

Problem visible on latest Armbian Xenial 5.38, also on Armbian Xenial 5.24.

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7 hours ago, mostly said:

As soon as kernel starts loading, little light-green box 6x4px appears at the bottom-left corner of the screen and never goes away.

 

It is possible that this screen resolution is not well tuned -> someone with such troublesome monitor and knowledge would need to poke around here.

 

We will ditch this kernel as soon as we get up video acceleration, MALI and sufficient stability with a modern kernel. How about this one, is it working ok?

https://dl.armbian.com/orangepipcplus/Ubuntu_bionic_dev_nightly.7z

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12 hours ago, Igor said:

It is possible that this screen resolution is not well tuned -> someone with such troublesome monitor and knowledge would need to poke around here.

 We will ditch this kernel as soon as we get up video acceleration, MALI and sufficient stability with a modern kernel. How about this one, is it working ok?

https://dl.armbian.com/orangepipcplus/Ubuntu_bionic_dev_nightly.7z

 

I was not able to change resolution on mainline, but thanks a lot for pointing to the right patch.

The patch still has wrong parameters for 1024x768. After changing them to appropriate values (according to timings calculator), green box disappeared and hdmi sound becаme perfectly clear.

Pull request #1013

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