topic Re: imx6q lvds和hdmi双屏同显 in i.MX Processors

imx6q lvds和hdmi双屏同显

jakiewen — Mon, 16 Jul 2018 08:44:48 GMT

公司产品医疗电子行业，linux4.1.15+qt系统，需要屏幕lvds主显和hdmi线接出屏同时显示一个应用程序的输出

目前我们的uboot设置如下

root@Summer:~# fw_printenv mmcroot

mmcroot=/dev/mmcblk3p2 rootwait rw

root@Summer:~# fw_printenv mxcfb0

mxcfb0=video=mxcfb0:dev=ldb,1920x1080@60,if=RGB888,bpp=16

root@Summer:~# fw_printenv mxcfb1

mxcfb1=video=mxcfb1:dev=hdmi,1920x1080@60,if=RGB24,bpp=24

root@Summer:~# fw_printenv mxcfb2

mxcfb2=video=mxcfb2:off

root@Summer:~# fw_printenv mxcfb3

mxcfb3=video=mxcfb3:off

经查，这样设置没有效果，主要主屏输出lvds，hdmi不输出；

设置fb0为hdmi，fb1为lvds，则主要输出在hdmi，lvds没有输出；

设置fb0为lvds，fb2为hdmi，则默认只输出lvds（因为qt程序默认用的fb0输出）

开启两个进程分别输出到fb0和fb2，则两个屏幕都能输出但是不是同一个内容；

请教下是否有解决方案

Re: imx6q lvds和hdmi双屏同显

jakiewen — Tue, 17 Jul 2018 06:01:43 GMT

linux+ qt

uboot para:

fw_setenv mmcroot '/dev/mmcblk3p2 video=mxcfb0:dev=ldb,1280x800M@60,if=RGB666,bpp=32 video=mxcfb1:dev=hdmi,1920x1080M@60,if=RGB24,bpp=32 video=mxcfb2:off video=mxcfb3:off ldb=dul1 rootwait rw'
We could get lvds output, but hdmi does't output.

fw_setenv mmcroot '/dev/mmcblk3p2 video=mxcfb1:dev=ldb,1280x800M@60,if=RGB666,bpp=32 video=mxcfb0:dev=hdmi,1920x1080M@60,if=RGB24,bpp=32 video=mxcfb2:off video=mxcfb3:off ldb=dul1 rootwait rw'

We could get hdmi output, lvds does't output.

fw_setenv mmcroot '/dev/mmcblk3p2 video=mxcfb0:dev=ldb,1280x800M@60,if=RGB666,bpp=32 video=mxcfb2:dev=hdmi,1920x1080M@60,if=RGB24,bpp=32 video=mxcfb1:off video=mxcfb3:off ldb=dul1 rootwait rw'

We could get hdmi output and lvds output by two different qt process seperately.

So how can i get both lvds and hdmi output at the same time by one process？

Re: imx6q lvds和hdmi双屏同显

yitang — Mon, 23 Jul 2018 02:07:17 GMT

hi 俊凯文:

i had the same problem, how did you solved it in the end?

Re: imx6q lvds和hdmi双屏同显

joanxie — Mon, 23 Jul 2018 07:37:28 GMT

did you check your ipu_id and disp_id in your source code? try not to set them in the same ipu, and could you give me the log file of command 1 and command 2?

Re: imx6q lvds和hdmi双屏同显

jakiewen — Mon, 30 Jul 2018 06:01:50 GMT

1.how to check this，driver code or dtsi？

2.which log do you want?kernel startup log?

Re: imx6q lvds和hdmi双屏同显

joanxie — Mon, 13 Aug 2018 06:53:33 GMT

pls refer to the topic ：

https://community.nxp.com/thread/311751

Re: imx6q lvds和hdmi双屏同显

yitang — Tue, 14 Aug 2018 06:02:06 GMT

it is same setting for Android like ubuntu,is right?

Re: imx6q lvds和hdmi双屏同显

yyuan — Fri, 12 Apr 2019 13:49:26 GMT

你好

我现在也遇到了这个问题我的是lcd+hdmi，你的问题解决了吗？

我的hdmi是fb1，

谢谢啦