[meta-freescale] display mirror Linux 3.10.53
picmaster at mail.bg
Fri Feb 13 00:45:42 PST 2015
On 02/13/2015 03:05 AM, carlos.casillas at freescale.com wrote:
> Hello all,
> Some customers are asking for how to mirror the LCD screen (LVDS) on a
> HDMI display.
> I have reached and I found many references about enabling a secondary
> frame buffer and then a echo and dd on it; however, the secondary screen
> is corrupted (has a different resolution). When using two LVDS screens,
> the secondary screen is shown properly, but just the frame shown when
> the dd command was called is printed.
> Does anyone know how to dynamically “clone” the primary screen (LVDS) on
> a HDMI display (either on boot time or user space)?
Xorg supports display cloning, but copying graphics data to the cloned
display will consume some bus bandwidth even if DMA is used. This can
add significant load to designs using low-budget memory subsystems.
Also, I'm not sure whether the VPU-accelerated video playback will be
handled across the cloned displays :(.
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