Rock 5B - HDMI 4K 120 hz

#1

Has anyone achieved 4k and 120hz with his Rock 5B? If so, what image do you use?
I tried several images (Armbian, RebornOS, Joshua Riek, etc. with 5.1 and 6.1 Rockchip Kernels) but had no luck.

#2

Have you tried Android?

#3

Yes, Android is limited to 4K60

#4

I have no further suggestions. It might be that Rockchip has not released a kernel with this enabled.
One long shot though - maybe you can try a mainline kernel (armbian + Linux 6.11) but it most likely will be even worse.

#5

RK3588’s spec shows it doesn’t support 4K@120hz, https://www.cnx-software.com/pdf/Rockchip RK3588 Datasheet V0.1-20210727.pdf

#6

thanks! There is no word about 1440p 120 hz either, but that works… If it is capable of 8k60, shouldn’t 4k120 be possible? I thought HDMI 2.1 supports 4k120.

#7

The above hardware specs says its limited to 60hz output for everything so its probably a lower level limitation of the video processor than the HDMI specification.

HDMI 2.1 doesn’t mean the system supports all of the features of that either, it did initially but the HDMI Forum then changed it so now you can have HDMI 2.0 level spec ports claiming to be HDMI 2.1.

#8

Thanks! Do you have any recommendations for a SBC that supports 4k120 and h265 decoding?

#9

Probably Rock6, when it comes out :slight_smile:

#10

When will that be?

#11

Aren’t Orange PI 5 and Rock 5B pretty much the same? Looks like 4k120 is possible on Orange Pi 5…

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#12

This just decodes 4k120hz video streams to reduce game streaming latency, not hdmi display 120hz

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