Android TV 9 screen resolution limited

#1

Hi,
I installed last-built android TV 9.0 firmware (20200827) on my rock pi 4B. I connected it to a UHD 4K TV. Everything went well. However, the maximum screen resolution shown in the list is only 1920x1080. I’ve deleted resolution_white.xml in system/usr/share, after reboot, I still can’t get 3840*2160 available. Please give me some advice to solve this problem. Thanks!

#2

The HDMI resolution is 4K(check your monitor input report), and the Android UI is 1080P but when you play 4K video, the output video resolution is 4K.

#3

Thanks for your reply! I found it might be the cable problem. After I remove the HDMI extension cable, the 4K resolution is finally avaliable!