topic Re: Does HDMI resolution shared with lvds panel resolution? in i.MX Processors

Does HDMI resolution shared with lvds panel resolution?

wangtsungli — Sun, 19 Aug 2018 14:14:57 GMT

Hi Community,

I'm working on i.MX6 Quad sabre-SD platform and build Android 6.0 for my OS system.

Now I'm working on HDMI and LVDS show different resolution at the same time.

Here is my u-boot command line settings.

bootargs=console=ttymxc0,115200 init=/init video=mxcfb0:dev=ldb,bpp=32 video=mxcfb1:dev=hdmi,1920x1080M@60,bpp=32 video=mxcfb2:off video=mxcfb3:off vmalloc=256M androidboot.console=ttymxc0 consoleblank=0 androidboot.hardware=FX100 cma=384M androidboot.selinux=disabled androidboot.dm_verity=disabled no_console_suspend=1 enable_wait_mode=off

ldb is on mxcfb0 and HDMI is on mxcfb1.

Here is the situation.

My LVDS panel resolution is 1024*768 and my HDMI resolution is expected to FULL HD.

But when they showed up, HDMI showed 1024*768 resolution instead of FULL HD.

Question:

Is that possible HDMI and LVDS panel showed in different resolution?
If can how can I complete it? Do I need to modify kernel driver?

Thanks in Advanced!

Re: Does HDMI resolution shared with lvds panel resolution?

igorpadykov — Sun, 19 Aug 2018 23:13:11 GMT

Hi tsung

HDMI and LVDS may work with different resolutions, please try to follow

sect.3.4.3 Booting with dual displays: LVDS and HDMI displays attached

Android Quick Start Guide. Use software from

i.MX Software|NXP

Best regards
igor
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Re: Does HDMI resolution shared with lvds panel resolution?

wangtsungli — Mon, 20 Aug 2018 01:48:10 GMT

Hi igorpadykov‌

I can show two display already.

But what my problem is how can I show two different resolution.

Android Quick Start Guide on sect 3.4.3 just tell me how to set the u-boot environment.

In my question I had post my u-boot environment and is same as the setting told in sect 3.4.3.

Still my HDMI still followed LVDS's resolution and can not show FULL HD.

How is this happened?

Re: Does HDMI resolution shared with lvds panel resolution?

igorpadykov — Mon, 20 Aug 2018 04:57:29 GMT

please check additional suggestions on

LCD and HDMI interface not working together !

Best regards
igor