We have installed Rock Pi 4 with Debian Desktop from the download page https://wiki.radxa.com/Rockpi4/downloads . The image was played with Rufus 3.4 on a 32GB SD card.
Version on installation: Debian Stretch 9.9
Kernel on installation: 4.4.154-90-rockchip-ga14f6502e045
Basic updates have been carried out
sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist-upgrade
Kernel is dist-upgraded to version 4.4.154-91-rockchip-g70838c09a6b6 after dist-upgrade
According to kernel list there is no more current kernel
Kernel List: sudo apt-cache search linux-image
CEC client and dependencies were installed with sudo apt-get install cec-utils
libCEC Version: 4.0.2
CEC was tested on the same CEC-enabled monitor as libreELEC with the commands:
(The Rock Pi 4 was first tested with libreELEC for CEC functionality. Under libreELEC (Leia) 9.0.0 the TV is detected and can be switched off for example).
The troubleshooting brings us to the following forum post: Send HDMI CEC messages using cec-client The problem should be solved since April with kernel integration.
Apparently the most recent kernel is 4.4.154-91-rockchip-g70838c09a6b6 and the CEC is still not working.
@mo123 could help! can I somehow bring a kernel to my debian with these changes already integrated? Or can somebody make a ready debian image to install on my Rock Pi 4B?
The hardware support in Debian is great, with graphics card recognition in chromium, etc, however, I badly need to get the CEC working too!
Thanks for any pointers or ideas how to bring this forward!
Do you use mainline kernel not the 4.4 kernel?
If so then these are the LibreELEC CEC mainline kernel changes.
You can basically fork it to your Github account and in the Debian build files change the kernel source to use yours instead. Or you can save all the individual kernel commits as patches and then include it in your Debian build. Or you can make all the kernel changes on your PC and then upload everything to a kernel folder on your Github.
I have only built LibreELEC and Armbian before so not sure how to build Debian or if it works the same way. Maybe if I have more time, Iāll try to check how it works.
Have you tried another Linux OS with a mainline kernel like Manjaro and checked if CEC works there?
Maybe it will be a good idea to check other OSās first and find one where it works then you can look at itās kernel source for any HDMI CEC changes that might help.
Yes, I was trying to build a mainline kernel, after reading that cec should be supported there from 5.1. I dont exactly care if in the end it will be 4.4 or 5.1 or whatever, as long as cec works. Is it written somewhere how to build your own debian image, so i can do the above fork and change kernel that you write?
The forum formats it to show a single commit in blue text too.
You must click on the link next to the Github icon at the top, not the middle blue text to see the whole repo with all commits.
So you need to use this repo and replace the spaces with / github.com kwiboo linux-rockchip commits rockchip-4.4-2019-cec
Hello, I happen to have almost the same problem!
My current kernel is 4.4.154-92-rockchip-g58d4b8d2fd3b on Debian 9.11 stretch.
Everything is working great so far but i canāt seem to get the HDMI-CEC to work.
According to this post a fix was already implemented into the kernel back in April.
Which kernel version actually supports HDMI-CEC?
I canāt seem to find any more recent ones than 4.4.154-92. Is it the most recent one or do i have to upgrade in a specific way other than normal dist-upgrades?
Iām also interested in Ubuntu, is there perhaps a Ubuntu version where HDMI-CEC is available?
Hi Stephen,
thank you for the quick response. Iāve installed the new kernel using the packages provided but to no avail regarding CEC. As mentioned I have almost the same problem so my cec-client also doesnāt find any devices whatsoever.
Output for the scan being āautodetect FAILEDā instead of actually trying to find devices.
My current Kernel is now 4.4.179-6-rockchip-g246d1b34 and Iāve re-installed the cec-client just to be sure.
Hello, when will there be a solution to the CEC problem? Does anyone have a solution that works? It should have been solved since the April Kernel. Is there a Debian version with CEC to download?
Hello Stephen, are there any news regarding a possible solution in sight? Itās been a few days now and Iām still struggling with the same problem. An estimate when we could expect a solution would be nice.
Seems HDMI CEC is also not working on some tvās with AndroidTV 9 firmware I built.
HDMI CEC is working correctly with Android 9 with another RK3399 device, so it must be some small firmware problem. Maybe the Android, Linux HDMI CEC issue is related and to do with the kernel or dts?
The TV isnāt the issue in my case. Iāve also tested CEC using libreELEC just like NBA said:
libreELEC on the same device with the same TV works just fine. So the device and TV can certainly do it.
What still confuses me most is that according to jack from this post the issue should have been resolved long ago.
In my case CEC is a necessary feature so I really need it to work.
All Kernels Iāve tried donāt work, including the most recent ones like
-4.4.154-91-rockchip-g70838c09a6b6
-4.4.154-92-rockchip-g58d4b8d2fd3b
-4.4.179-6-rockchip-g246d1b34
It says since April 2019 but wich Kernel Version is that exactly supposed to be? And why wouldnāt any recent ones not work?
Here is also a patch to fix LG Simplink proprietary CEC on Android.
For Android Pie
Seems code is a little different, I couldnāt get it to compile on RockPi 4 Pie.
Maybe Radxa can get it compiled? https://pastebin.com/raw/HyrdZ179
You really donāt need a TV to try it out. Using cec-client -l should display information about the installed cec-client on the Rock Pi 4. The following is an example from a Raspberry Pi. Itās the same output wheter it is connected to a TV with HDMI-CEC or a plain monitor without CEC.
The Rock Pi however stops at: Found devices: 0
The other command used to get information would be: echo 'scan' | cec-client -s -d 1. This one lists all devices available. So again with the Raspberry Pi it looks like this when connected to a TV with CEC:
With a plain monitor without CEC just the TV is missing from the list:
