View source for How to config Multi-Display for rk3288 series Debian9

RSB-4680 surport 3 display ports&nbsp;: eDP、LVDS、HDMI .&nbsp;Only two ports work at the same time .

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

== Enter U-boot interrupt mode ==

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

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



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

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

== Default Support Display ==

{| border="1" cellspacing="1" cellpadding="1" style="width: 408px;"
|-
| style="width: 124px;" | <span style="color:#FF0000;">'''Port'''</span>
| style="width: 124px;" | <span style="color:#FF0000;">'''RSB4680'''</span>
| style="width: 142px;" | <span style="color:#FF0000;">'''USM110'''</span>
|-
| style="width: 124px;" | edp
| style="width: 124px;" | edp-1920x1200<br/>edp-1920x1080<br/>edp-1024x768<br/>
| style="width: 142px;" | edp-1920x1080<br/>edp-1280x720<br/>edp-1024x768<br/>edp-720x480<br/>edp-640x480<br/>
|-
| style="width: 124px;" | lvds
| style="width: 124px;" | lvds-g070vw01<br/>lvds-idk1110wp<br/>lvds-g150xgel05<br/>lvds-g215hvn01<br/>lvds-p460hvn02<br/>
| style="width: 142px;" | NA
|-
| style="width: 124px;" | hdmi
| style="width: 124px;" | hdmi-default<br/>
| style="width: 142px;" | hdmi-default<br/>
|}

<br/>'''NOTE&nbsp;:&nbsp;'''

1. The name of the panel must begin with "edp-"、"lvds-" or "hdmi-" .

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

lvds_g070vw01: <span style="color:#FF0000;">'''lvds-g070vw01'''</span>

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

edp-default (edp-1920x1080) and&nbsp;hdmi-default as default setting.

3. Check your configuration in Terminal or debug console.
<pre>cat /proc/cmdline
... prmry_screen=edp-1920x1080 extend_screen=hdmi-default
</pre>