richard wang

dual screen with LVDS & HDMI

Discussion created by richard wang on Feb 16, 2012
Latest reply on Feb 16, 2012 by richard wang

Hello , how to setup the SABRE to dual screen with LVDS & HDMI


#printenv : // I add two line in uboot

setenv bootargs_base 'setenv bootargs console=ttymxc0,115200 ${lvds_and_hdmi}'
setenv lvds_and_hdmi 'video=mxcdi0fb:RGB24,1024x768M@60 hdmi video=mxcdi1fb:RGB666,XGA di1_primary ldb=di1'


# when I login , I turn the screen on :                                                                                  
echo 0 > /sys/class/graphics/fb1/blank

# the terminal output
mxc_ipu mxc_ipu: Channel already disabled 7                                                                                       
mxc_ipu mxc_ipu: Channel already uninitialized 7 


# when I plug HDMI connector to SABRE, the terminal output :

sii902x 2-0039: Sii902x: same edid


# I try to write some garbage to framebuffer
cat /bin/busybox > /dev/fb0
cat /bin/busybox > /dev/fb1

# LVDS (/dev/fb0) change

# HDMI (/dev/fb1) not change, the screen always show  'no signal'


It seem the framebuffer (/dev/fb1) not connect to HDMI