Some question about tying HDMI and VGA after system bootup

Dear all,

I am using DVRRDK V04.00.00.03.

What I am trying to do is to tied HDMI out and VGA output. ( show same content on VGA with HDMI )

By running DEC+DIS usecase in run.sh, I can successfully tied them by modifying:

//Vdis_tiedVencInit(VDIS_DEV_HDCOMP, VDIS_DEV_DVO2, &vdisParams);

Vdis_tiedVencInit(VDIS_DEV_HDMI, VDIS_DEV_HDCOMP, &vdisParams);

Everything work good, I can see same frame-buffer and video on both VGA & HDMI.

But, that is my final objective...

I need VGA & HDMI to be tied right after the time system boot up before any chain application launch. (run.sh .etc)

Here are what I tried:

echo 0 > /sys/devices/platform/vpss/display0/enabled
echo 0 > /sys/devices/platform/vpss/display3/enabled
echo component,rgb888 > /sys/devices/platform/vpss/display3/output
echo 148500,1920/88/148/44,1080/4/36/5,1 > /sys/devices/platform/vpss/display3/timings
echo 3 > /sys/devices/platform/vpss/system/tiedvencs
echo 2:hdmi,hdcomp > /sys/devices/platform/vpss/graphics0/nodes

After these settings, I run fb program which would draw something on FB0.

Now problem comes,I can see normal video on HDMI output.

But on VGA output, here is the result:   (I have 3 monitors)

AOC VGA: good. Same content with HDMI

ViewSonic VGA: the picture right-shift seriously. and half of picture is cut.

ASUS VGA: NO any signal...

What I am doing is just change VGA cable among three monitor.

Once I launch run.sh Dec+Dis usecase, all three VGAs work good and perfectly tied with HDMI.

Why there is such difference on each monitor?

Can you please advise what setting I was missing ?

Or what action I should do?

Thanks a lot.

- John