LVDS + HDMI clone mode from IPU

[rick_man]

Hi , 

We have gone through all the device tree and forums, 

i.mx6q Enable Dual Display of Ubuntu 

imx6q dual display LVDS +HDMI has problem `

We have the DUAL lvds clone mode already working but we want LVDS + HDMI to work in clone mode. 

Any help on this regards will help, 

Thanks,

-Rick.

[igorpadykov]

Hi Rick

unfortunately such case is not supported in nxp bsps, maybe helps attached experimental patch for L3.0.35,

display cloning use case for i.MX6DQ SabreAI:  sending the same IPU DI content to LVDS and HDMI, in the same time.
For example, have IPU0 DI0 to drive both LDB and HDMI.

Video parameters should be: video=mxcfb0:dev=ldb,LDB-XGA,if=RGB24 ldb=sin0 video=mxcfb1:dev=hdmi,1024x768@60,if=RGB24

Best regards
igor
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[sergei_p]

Hello Igor,

Could you please comment on the status of such use case (IMX6Q clone LVDS/LCD display to HDMI) in the recent NXP 4.14.78 BSP? Does it have such use case?

Thanks!

Regards,

Sergei

[igorpadykov]

Hi Sergei

no it is not officially supported.

Best regards
igor

[xiaolong_zhang]

i have the same problem. my kernel 3.0.35,cpu imx.6Q, QT4.8.5; i get the patch,but it can not  disaply in the same time.

[sergei_p]

I'm sorry for being so stubborn, but here is what I see in the Android N7.1.2_2.0.0 Release notes document, Table 2 "Features":

...

UI (dual display,
LVDS+HDMI, UI
mirror displayed
on second
device)

...

This feature is supported on the IMX6Q boards for Android, out-of-box.

Could please someone explain, on the technical level, what needs to be done in the Linux kernel to get the LCD/HDMI mirrored mode working on Linux? Perhaps, I need to configure IPU to use the same ipu_id and display_id for both controllers?

[igorpadykov]

dual display is described in sect.3.4.3 Booting with dual displays: LVDS and HDMI displays

attached Android_Quick_Start_Guide.pdf found on

i.MX Software | NXP 

Best regards
igor