RPi 5 - HDR too dark when moving from 12.0.1 to 12.0.2

mathmath51 · January 24, 2025 at 2:36 PM

Hi,

I've a RPi 5 and I've updated to the latest stable version (12.0.2) from 12.0.1 that I used since it went available. I've also updated to the eeprom version available with the new release.

Today, while watching a 4k HDR video, I immediately noticed that the colors were way too dark and it reminded me of an issue that affected the version 10.0.2.

If on my TV I switch the HDMI Black Level from "limited" to "full", then I'm back with what I consider being the "proper" black level.

Note that if I set "Auto" on my TV, I get the same result as if I set it to "Limited".

Is it possible that a change on the Kodi or Libreelec side could have caused this issue ?

Thanks

**chewitt** · January 24, 2025 at 2:45 PM

Code

echo 'modetest -M vc4 -w "32:Broadcast RGB:1"' > /storage/.config/autostart.sh

I've not commented my crib notes, but I think that's the command. If you want to test ad-hoc:

Code

systemctl stop kodi
modetest -M vc4 -w 32:"Broadcast RGB":1
systemctl start kodi

mathmath51 · January 24, 2025 at 3:05 PM

Thanks, I used you second set of commands and now when I set my tv on "Auto" it's the same as if I set it to "full" and it looks better.

Was it due to a change between the 2 versions or a setting that changed for example ?

Should I use you first command so that when comes the next reboot or update I have the proper config loaded up ?

Thanks

**chewitt** · January 24, 2025 at 4:32 PM

Use the first command and the change will be applied on each boot. No idea what the difference is, there's not much that changed in the release aside from Kodi and kernel bumps. I'm also using an RPi5 and haven't noticed anything.

**popcornmix** · January 24, 2025 at 4:55 PM

I don't believe anything has changed in this area. Are you sure that downgrading back to 12.0.1 does change the behaviour compared to 12.0.2?

Can you ssh in and run "kmsprint" and "kmsprint -p" and post the output for both 12.0.1 and 12.0.2?

(without having run the modetest command chewitt suggested for this test).

mathmath51 · January 24, 2025 at 6:49 PM

Hi,

You'll find attached the results of the commands. I've also uploaded what I got with the command Chewitt posted enabled for reference.

I've double checked by watching the same HDR file with 12.0.1 and to my eyes there is a difference compared to watching it with the 12.0.2.