✎ odroid-c2:troubleshooting:changing_hdmi_resolution [ODROID Wiki]

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====== How to change HDMI output resolution ======
**ODROID-C2** can support various resolution on HDMI output, you can select one of supported resolutions for your display (LCD monitor or TV).
<WRAP round tip 70%>
Please make sure the resolution you select can be supported by your display before you start. Otherwise you would be hard to recover the resolution again.
</WRAP>
**[[troubleshooting/supported_resolutions|Supported resolutions]]**
===== Android =====
We provide you a simple but useful application, **ODROID Utility**. This helps you to change the resolution by menu as below and you can select one of them for your display. Once you select one, click the button **Apply and Reboot**. Then your **ODROID-C2** will restart with new resolution.

{{:en:odroidc2_screen.png?800|}}

===== Linux / Ubuntu =====
[[odroid-c2:application_note:software:auto_detect_display|Display Auto Detection using EDID]]
===== Lowlevel Change =====
This section introduce you to change the resolution by manual, this would be helpful if you are failure to change the resolution and not able to sett the face of **ODROID-C2**.

The fact what initiate the resolution is from **U-boot** and the environment key is **hdmimode**. Probably your U-boot would have the one like this by default.
<code bash target>
odroidc#print hdmimode
hdmimode=720p60hz
</code>
This will be passed to Linux kernel by **bootargs** just before Linux kernel is started. Here is the default value of **bootcmd** which starts Linux kernel. As you see, **hdmimode** is passing as boot argument.
<code bash target>
odroidc2# print bootcmd
bootcmd=cfgload; setenv bootargs root=/dev/mmcblk0p2 rw init=/init rootwait console=ttyS0,115200 hdmimode=${hdmimode}
hdmitx=${cecconfig} logo=osd1,loaded,${fb_addr},${hdmimode} androidboot.hardware=odroidc2 androidboot.serialno=${fbt_id#}
androidboot.selinux=disabled;showlogo ${hdmimode}; movi read dtb 0 0x1000000; movi read boot 0 0x20000000;
booti 0x20000000 - 0x1000000

</code>
==== How to change the value of hdmimode ====
There are three ways to change **hdmimode** to change the resolution, you can replace **1080p60hz** with the other resolution you wish to change for your display.
And only the way with adjusting hdmimode arg value in boot.ini is available for ODROID-C2 so far, the other ways are in progress. 

=== U-boot ===
Currently, 720p60hz mode is fixed on U-Boot stage after power-on and reset.
But you can change hdmimode temporarily using 'showlogo' command.
<code bash target>
showlogo 1080p60hz
</code>
=== Boot.ini ===
You can boot with **boot.ini** without changing U-boot environment values permanently. If **boot.ini** is existed in FAT partition **ODROID-C2** does boot with it first, unless boot with default setting stored in U-boot environment.
The example related to display is as following.

<code ini>
setenv hdmimode "720p60hz"

# CEC Configuration
setenv cecconfig "cecf"

# HDMI/DVI Mode Configuration
# This will enforce the signal type of display
# "hdmi" - For HDMI interface
# "dvi" - For DVI interface
setenv vout_mode "hdmi"

setenv bootargs "${rootopt} ${consoleopt} hdmimode=${hdmimode} hdmitx=${cecconfig} vout=${vout_mode} overscan_top=${top} overscan_left=${left} overscan_bottom=${bottom} overscan_right=${right} logo=${logoopt} ${androidopt} ${selinuxopt}"

showlogo ${hdmimode}

</code>