[Yocto] How to support clone mode for dual displays?

[charleshuang]

Hi,

BSP: fsl-yocto-3.14.28_1.0.0

Q1. As we known, the 'fsl-image-qt5' image has a Sato desktop interface. But it seems only render on one framebuffer. Is any configurations I can set to support clone mode for two displays? Or how to modify to archieve this?

Q2.  If the answer above is NO, how to add additional user interfaces, e.g. LXDE, XFCE, etc. to Yocto platform?

Thanks,

Daniel

[shubhamsanghvi]

Hi Winston,

I have only experimented  with 2 LVDS display.

But if I was to do this task, I would first make sure that both my displays are identified by X11.

Once I am able to play the QT application on both the displays individually, I would try to find a workaround for cloning displays through the X11 framework.

Hope this helps.

Thanks,

Shubham

[shubhamsanghvi]

Hi charles huang,

How is the VGA display connected to the iMX chip? i.e. Through what interface?

Best Regards,

Shubham

[winstonhuang]

Hi Shubham,

VGA --> Chrontel CH7055 --> iMX6

Best Regards,

Winston

[shubhamsanghvi]

Hi charles huang,

If you are using 2 LVDS displays then there is a dual-mode setting in the LDB which clones the data from one display to other.

To enable it you will have to add the 'dual-mode' property in LDB's device tree node.

You can take the patch provided in the below mentioned thread as reference and replace the 'split-mode' with 'dual-mode' :

https://community.freescale.com/message/504331

Best Regards,

Shubham

[winstonhuang]

Hi Shubham,

If I want to use dual clone display with LVDS+VGA, is it possible ?

If yes, please give me some hint.

Best Regards,

Winston

[joanxie]

do you mean you want to play the same video on the different display?

if yes, dual clone display is one kind of dual display, if your board can support lvds+vga, then you can set two gstreamer commands, one for lvds, another for vga, use " &" to conncet them.

if one wants to display the same video, then set the same parameter in the commands.

[winstonhuang]

No, not only video.

It has to be everything starting from Qt desktop.

[joanxie]

if you need to set dual display, can set the uboot command, the detailed information, pls refer to the enclosed file. search dual display in the document.

[charleshuang]

Hi Guanqiong,

The document you attached describes dual display, not dual clone display, is there any way to set dual clone display?

or did I miss something important in that document ?

Best Regards,

Winston