Rock 4 SE wrong Hdmi Resolution when TV is started later

stevensen · December 4, 2022 at 6:49 PM

Hello,

I am still a beginner in Librerelec 10.0.2 and Linux.

I have here a Rock 4 SE and still have a problem with Hdmi and the resolution.

When the TV is on, the resolution (HD) is set correctly, but when the Rock 4 is recording and I turn on the TV later, a smaller resolution is set.

The Rock can not read the correct values from the TV off, it needs an edid or something like that.

How can I fix this ? Please keep in mind I am a beginner

**chewitt** · December 5, 2022 at 1:46 AM

Run "getedid create" .. https://wiki.libreelec.tv/configuration/edid (the Intel instructions apply to all devices using modern/upstream kernels)

stevensen · December 5, 2022 at 7:42 PM

Thanks for your answer

somehow it does not work

LibreELEC:~ # getedid create

-sh: getedid: not found

I try your postet link

**chewitt** · December 6, 2022 at 5:56 AM

Follow the manual instructions for Intel then.

stevensen · December 7, 2022 at 9:40 AM

Hello,

I have physically connected a Hdmi cable on the running TV

Should not be a Hdmi connector / driver to see?

login as: root

root@192.168.178.32's password:

##############################################

# LibreELEC #

# https://libreelec.tv #

##############################################

LibreELEC (official): 10.0.2 (RK3399.arm)

LibreELEC:~ # tail /sys/class/drm/*/status

connected

LibreELEC:~ #

**chewitt** · December 7, 2022 at 12:45 PM

Run "dmesg | paste" and share the URL generated

stevensen · December 7, 2022 at 1:00 PM

ok here:

http://ix.io/4hY1

**HiassofT** · December 7, 2022 at 6:32 PM

The "getedid" only exists for x86 and RPi ATM, but we ship some internal helper scripts (beware: that may change in the future) that may help you:

dump-active-edids checks for connected HDMI ports, writes the edid to /storage/.config/edid/edid-<CONNECTOR-NAME>.bin and prints the connectors.

eg here on RPi4:

Code

xbmc:~ # dump-active-edids 
found active connector(s) HDMI-A-1
xbmc:~ # ls -l /storage/.config/firmware/edid/edid-HDMI-A-1.bin 
-rw-r--r--    1 root     root           256 Dec  7 19:21 /storage/.config/firmware/edid/edid-HDMI-A-1.bin

create-edid-cpio creates /flash/edid.cpio with the edids from

/storage/.config/firmware/edid/

eg:

Code

xbmc:~ # create-edid-cpio 
successfully created /flash/edid.cpio

Now there's two things left to configure manually:

Adjust the kernel command line, configure the connector to use the edid file and the tell the video subsystem to ignore the hotplug (i.e. connected) signal of the HDMI connector.

eg here on RPi4 the following is added:

Code

drm.edid_firmware=HDMI-A-1:edid/edid-HDMI-A-1.bin video=HDMI-A-1:D

And you also need to configure the bootloader to load edid.cpio as an initrd.

eg here on RPi4 (with very different bootloader than Rockchip, Allwinner etc) it adds this line:

Code

initramfs edid.cpio

I don't have any rockchip boards set up at the moment so I can't tell you exactly which file you have to modify (might be /flash/extlinux/extlinux.conf) - hopefully some other users or devs can chime in here.

so long,

Hias

stevensen · December 9, 2022 at 9:56 AM

Thanks for the answer!

I am so far as seen in the picture.

What do now with this line:

Code

drm.edid_firmware=HDMI-A-1:edid/edid-HDMI-A-1.bin video=HDMI-A-1:D

I do not understand yet.

And on my rock 4 exists this file:

/flash/extlinux/extlinux.conf

With this content:

Code

LABEL LibreELEC
  LINUX /KERNEL
  FDT /rk3399-rock-pi-4b.dtb
  APPEND boot=UUID=0503-4902 disk=UUID=8ff85d86-0886-4367-affc-e7e92877481a quiet console=uart8250,mmio32,0xff1a0000 console=tty0 coherent_pool=2M cec.debounce_ms=5000

What should I do now?

Excuse my cluelessness <:(

**chewitt** · December 9, 2022 at 3:59 PM

Code

LABEL LibreELEC
  LINUX /KERNEL
  FDT /rk3399-rock-pi-4b.dtb
  APPEND boot=UUID=0503-4902 disk=UUID=8ff85d86-0886-4367-affc-e7e92877481a quiet console=uart8250,mmio32,0xff1a0000 console=tty0 coherent_pool=2M cec.debounce_ms=5000 drm.edid_firmware=HDMI-A-1:edid/edid-HDMI-A-1.bin video=HDMI-A-1:D

^ edit /flash/extlinux/extlinux.conf and append it to the APPEND line

**HiassofT** · December 9, 2022 at 4:09 PM

And I think a separate line with INITRD /edid.cpio, before the APPEND line,might load the initrd.

so long,

Hias

stevensen · December 12, 2022 at 8:45 AM

thanks for help!

I had tried both variants, each time the computer did not start. Only when I had the Conf back in the original state it worked again.

I make a test copy today and try it again.

stevensen · January 2, 2023 at 4:14 PM

Happy new year!

After I made a backup. I started a new attempt and now it works!!

Thank you very much for help!

Rock 4 SE wrong Hdmi Resolution when TV is started later

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