i.MX ProcessorsのトピックDisplay both VGA and HDMI

Display both VGA and HDMI

Mats1z — Fri, 15 Mar 2013 04:26:20 GMT

I tried this bootargs of dual display-

setenv bootargs console=ttymxc0 init=/init androidboot.console=ttymxc0 video=mxcdi0fb:RGB24,1280x720M@60 hdmi video=mxcdi1fb:GBR24,VGA-SVGA di1_primary vga ip=none pmem=128M,64M fbmem=28M gpu_memory=128M vmalloc=576M

I got both VGA and HDMI displays but HDMI screen area is scaled down.

Now I turned off VGA and HDMI. Then configured new resolution for HDMI and turned it ON.

echo 1 >/sys/class/graphics/fb0/blank #vga off

echo 1 >/sys/class/graphics/fb1/blank #hdmi off

# cat /sys/class/graphics/fb1/modes

S:1280x720p-50

S:720x576p-50

S:1920x1080p-50

S:640x480p-60

S:720x480p-60

S:1280x720p-60

S:1920x1080p-60

# echo S:1280x720p-60 >/sys/class/graphics/fb1/mode

# cat /sys/class/graphics/fb1/mode

S:1280x720p-60

# echo 0 >/sys/class/graphics/fb1/blank #hdmi on

Still the hdmi is not using the entire display area. Both ends are left blank.

.How can I make my HDMI display "FULLSCREEN"?

Re: Display both VGA and HDMI

daiane_angolini — Fri, 15 Mar 2013 13:52:34 GMT

Are you using android?

As I remember there is some setprop for dual display. Is there any difference when you set it (as I remember you are able to determinate with display will be first one, please, let me know if I´m missing something)

Are you using the same monitor to display both VGA and HDMI? Is there any change that the blank areas are caused by monitor configuration?

I branched it to a new discussion because maybe someone else can add some light on this issue.

Re: Display both VGA and HDMI

Mats1z — Tue, 19 Mar 2013 04:25:28 GMT

I'm using android 2.3 a.k.a gingerbread.
setprop rw.SECOND_DISPLAY_CONNECTED=1 , this is configured automatically when hdmi cable is connected.
if hdmi is configured as primary display there is no problem of display scaling but dynamic detection becomes impossible.
my setup works only when vga is primary display and HDMI is secondary
I use 2 displays , one for vga and lcd for hdmi
when hdmi is primary display the entire screen area of display is used. So i don't think its an issue with monitor/lcd

Re: Display both VGA and HDMI

weidong_sun — Tue, 19 Mar 2013 05:53:26 GMT

Hello,Mats1z,

There only 1 IPU module in i.mx53 SOC, The biggest resolution is 1920x1080, If you want dual display by VGA and HDMI ports. Resolution should be suitable to be arragened.

Please try :

VGA : 1024x768

HDMI : 1024x768

Then check if image can display the entire screen.

Regards,

Weidong