-----Original Message-----
From: linux-fbdev-owner@vger.kernel.org [mailto:linux-fbdev-
owner@vger.kernel.org] On Behalf Of han jonghun
Sent: Friday, October 08, 2010 1:35 PM
To: linux-fbdev@vger.kernel.org
Subject: How to handle FBs for dual monitor

Hi,

I have a question how to handle dual display controller which controls
FBs and LCD panel.

If each FB only sees its own framebuffer, it does not matter.
But sometimes FBs should see the same framebuffer to support dual display.

For example I want to use single 960 x 800 framebuffer to support two
WVGA(480x800) LCDs.
And fb0(layer0@DISP.CON.0) looks at the left side of framebuffer,
fb3(layer0@DISP.CON.1) looks at the right side of framebuffer.
In this case should I handle only single fb(/dev/fb/0) not
two(/dev/fb0, /dev/fb3)?

[Senthil] I too have a similar scenario like this, and first thing comes to my mind is virtual framebuffer, but managing 2 devices memory by one virtual FB is the biggest challenge I am seeing in this.

How can I use dual display like this ? Is there any IOCTL COMMAND to use ?
How can I bind FBs and release the FBs ?
How can desktop support the feature ?

Can anyone help me?

Thanks

Best regards,
Jonhun Han.
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