View source for How to config Multi-Display for RSB-4710


=== '''Introductory''' ===

RSB-4710 surport 4&nbsp;display ports&nbsp;: eDP、LVDS（mipi to LVDS）、HDMI、DP&nbsp;（DP to HDMI）.&nbsp;Only two ports work at the same time .

You can config Multi-Display to eDP + HDMI 、eDP + LVDS、LVDS + HDMI 、eDP + DP、LVDS + DP、HDMI + DP.

'''Default Display Support:'''

{| border="1" cellpadding="1" cellspacing="1" style="width: 500px;"
|-
| '''Port'''
| '''Display'''
|-
| EDP
| 
EDP-1920x 1080

EDP-1366x768

|-
| LVDS
| LVDS-g070vw01<br/> LVDS-g150xgel05<br/> LVDS-g215hvn01
|-
| HDMI
| HDMI-default
|-
| DP
| DP-default
|}

== Contents ==

&nbsp;[[http://ess-wiki.advantech.com.tw/view/How_to_Config_Multi-Display_for_RK3399_RSB710# hide]]&nbsp;

*[http://ess-wiki.advantech.com.tw/view/How_to_Config_Multi-Display_for_RK3399_RSB710#Enter_U-boot_interrupt_mode 1&nbsp;Enter U-boot interrupt mode] 
*[http://ess-wiki.advantech.com.tw/view/How_to_Config_Multi-Display_for_RK3399_RSB710#eDP_.2B_HDMI 2&nbsp;eDP + HDMI] 
*[http://ess-wiki.advantech.com.tw/view/How_to_Config_Multi-Display_for_RK3399_RSB710#eDP_.2B_LVDS 3&nbsp;eDP + LVDS] 
*[http://ess-wiki.advantech.com.tw/view/How_to_Config_Multi-Display_for_RK3399_RSB710#LVDS_.2B_HDMI 4&nbsp;LVDS + HDMI] 
*[http://ess-wiki.advantech.com.tw/view/How_to_Config_Multi-Display_for_RK3399_RSB710#eDP_.2B_DP 5&nbsp;eDP + DP] 
*[http://ess-wiki.advantech.com.tw/view/How_to_Config_Multi-Display_for_RK3399_RSB710#LVDS_.2B_DP 6&nbsp;LVDS + DP] 
*[http://ess-wiki.advantech.com.tw/view/How_to_Config_Multi-Display_for_RK3399_RSB710#HDMI_.2B_DP 7&nbsp;HDMI + DP] 
*[http://ess-wiki.advantech.com.tw/view/How_to_Config_Multi-Display_for_RK3399_RSB710#Default_Support_Display 8&nbsp;Default Support Display] 

== Enter U-boot interrupt mode ==

Connect device to debug port, and open debug console. See more&nbsp;: [[How_to_debug_for_RK3399_RSB4710|How_to_debug]].

Press&nbsp;"ctrl + c" key before power up the device, until get the following information on debug console&nbsp;:&nbsp;
<pre>Hit any key to stop autoboot: 0
=> <INTERRUPT>
=></pre>

Then you can&nbsp;input the following cammand to config Multi-Display.

== eDP + HDMI ==
<pre>setenv prmry_screen edp-1920x1080
setenv extend_screen hdmi-default
saveenv
reset
</pre>

or
<pre>setenv prmry_screen hdmi-default
setenv extend_screen edp-1920x1080
saveenv
reset
</pre>

== eDP + LVDS ==
<pre>setenv prmry_screen edp-1920x1080
setenv extend_screen lvds-g070vw01
saveenv
reset
</pre>

or
<pre>setenv prmry_screen lvds-g070vw01
setenv extend_screen edp-1920x1080 
saveenv
reset
</pre>

== LVDS + HDMI ==
<pre>setenv prmry_screen hdmi-default
setenv extend_screen lvds-g070vw01
saveenv
reset
</pre>

or
<pre>setenv prmry_screen lvds-g070vw01
setenv extend_screen hdmi-default
saveenv
reset
</pre>

== eDP + DP ==
<pre>setenv prmry_screen edp-1920x1080
setenv extend_screen dp-default
saveenv
reset
</pre>

or
<pre>setenv prmry_screen dp-default
setenv extend_screen edp-1920x1080
saveenv
reset
</pre>

== LVDS + DP ==
<pre>setenv prmry_screen dp-default
setenv extend_screen lvds-g070vw01
saveenv
reset
</pre>

or
<pre>setenv prmry_screen lvds-g070vw01
setenv extend_screen dp-default 
saveenv
reset
</pre>

== HDMI + DP ==
<pre>setenv prmry_screen hdmi-default
setenv extend_screen dp-default
saveenv
reset
</pre>

or
<pre>setenv prmry_screen dp-fefault
setenv extend_screen hdmi-default
saveenv
reset
</pre>

== Default Support Display ==

{| border="1" cellpadding="1" cellspacing="1" style="width: 500px;"
|-
| '''Port'''
| '''Display'''
|-
| EDP
| 
EDP-1920x 1080

EDP-1366x768

|-
| LVDS
| LVDS-g070vw01<br/> LVDS-g150xgel05<br/> LVDS-g215hvn01
|-
| HDMI
| HDMI-default
|-
| DP
| DP-default
|}

'''NOTE&nbsp;:&nbsp;'''

1. The name of the panel must begin with "edp-"、"lvds-" 、"hdmi-"&nbsp; or “dp-”.

And it can be found in "kernel/include/dt-bindings/display/screen-timing/{LCDNAME}.dtsi" like&nbsp;:

lvds_g070vw01:&nbsp;'''lvds-g070vw01'''

2. If there is no configuration, you will get default setting&nbsp;:

hdmi-default&nbsp; and&nbsp;dp-default as default setting.

3. Check your configuration in Terminal or debug console.
<pre>cat /proc/cmdline
... prmry_screen=hdmi-default extend_screen=dp-default</pre>

{| border="1" cellpadding="1" cellspacing="1"
|-
| LVDS Name
| Resolution
|-
| lvds-g070vw01
| 800x480
|-
| lvds-g150xgel05
| 1024x768
|-
| lvds-g215hvn01
| 1920x1080
|}

== Using envtools in Debian/Android ==

Using envtools to setup envs in Debian/Android OS is very similar in uboot.

Take “eDP+HDMI”for example&nbsp;:

{| border="1" cellpadding="1" cellspacing="1"
|-
| '''In uboot'''
| '''In Debian/Android'''
|-
| setenv prmry_screen hdmi-default
| fw_setenv prmry_screen hdmi-default
|-
| setenv extend_screen edp-1920x1080
| fw_setenv extend_screen edp-1920x1080
|-
| saveenv
| &nbsp;
|-
| reset
| reboot
|}

'''Note&nbsp;:'''

The tool "fw_setenv" will save envs automatically in Debian/Android OS, so it isn't necessary to saveen manually.

'''Check current setting：'''

root@linaro-alip:~# cat /proc/cmdline<br/> storagemedia=emmc androidboot.storagemedia=emmc androidboot.mode=normal &nbsp;androidboot.verifiedbootstate=orange androidboot.slot_suffix= androidboot.serialno=a2fc4116ad6b2c4f &nbsp;rw rootwait earlycon=uart8250,mmio32,0xff180000 swiotlb=1 console=ttyS0,115200 root=PARTUUID=614e0000-0000 rootfstype=ext4 coherent_pool=1m quiet board_info=9 prmry_screen=hdmi-default extend_screen=lvds-g070vw01<br/> root@linaro-alip:~#

&nbsp;

== Configurate Multi-Display of differnt resolutions in Duplicate mode ==

If Multi-Display has differnt resolution in duplicate mode, you can see all view on the screen of big resolution and the view in the top left corner on the screen of small resolution.

If you want to the same view on the two screens. Using xrandr to configurate Multi-Display of differnt resolutions in Duplicate mode in Debian OS.

Take “LVDS (1024x768) + HDMI (1920x1080)”for example:
<pre> xrandr --output HDMI-1 --scale-from 1024x768
or
 xrandr --output LVDS-1 --scale-from 1920x1080</pre>