i.MX ProcessorsのトピックRe: How to solve over-scanning problem?

How to solve over-scanning problem?

Tarek — Tue, 06 Nov 2012 09:27:43 GMT

Hi,

Part of the console display is hidden when using HDMI TV.

I guess this is due to the TV over-scanning. Is there a solution to this problem?

Thanks,

Tarek

Re: How to solve over-scanning problem?

fengwei — Fri, 09 Nov 2012 06:00:05 GMT

Usually TV has display settings for over-scanning problems.

Re: How to solve over-scanning problem?

Tarek — Fri, 09 Nov 2012 09:39:20 GMT

It will be easier to change the platform than asking customers to change their TV's !

Re: How to solve over-scanning problem?

fengwei — Fri, 09 Nov 2012 10:09:00 GMT

Yes, you are right. I'm not the right person to answer this question :-). Let's wait for the golden answer.

Re: How to solve over-scanning problem?

jimmychan — Mon, 12 Nov 2012 02:40:22 GMT

would you tell me more detail about your question?

1. which board are you using?

2. which BSP are you using?

3. how to reproduce the problem on the board?

Thanks.

Re: How to solve over-scanning problem?

Tarek — Mon, 12 Nov 2012 09:30:57 GMT

The board I'm using is Nitrogen 6Q Board from Boundary Devices. The BSP is version 12.08 as I don't have access to 12.09 yet. I'm running Poky distribution and using Yoctoproject openembedded build system.

The board is connected to DGM HD TV using HDMI. Any Linux image that I run (Console or GUI) I find that part of the display around the edges is hidden as if I need to down size the screen to fit into the TV display. This is a common problem and surprisingly there is Android fix from Freescale

https://community.freescale.com/message/271488#271488

I was wondering if there is a similar patch for native Linux?

Thanks

Re: How to solve over-scanning problem?

jimmychan — Thu, 29 Oct 2020 09:12:22 GMT

Chun-Yi Cheng wrote:

The solution for over-scanning issue was applied into i.MX Android R10.3.1 release.

The kernel patch of Android should also be able to use in Linux.

Please refer to "4.4.5 overscan" of the attached "i.MX_Android_R10.3.1_User_Guide" for more detail information.

Thanks.

how to apply this feature

We export a property (sys.overscan.percent) to control the overscan percentage, customer can set this property to adjust the width of black border. (sys.overscan.percent = 100*h/H =100*w/W) The overscan percentage for width and height is the same, sys.overscan.percent Is limited at the range of 0~10.