N2 with Ubuntu - dark screen after boot

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blissarts
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N2 with Ubuntu - dark screen after boot

Unread post by blissarts » Wed Feb 12, 2020 5:45 am

Hello,
I have gotten my Odroid N2 last week and it works without any issue with the delivered CoreElec SD card.
However I want to use Ubuntu (image provided by HK) with my USB SSD.
It is booting up and I can work via ssh without problems but my TV screen stays dark. I see that the TV is switching off when I shut the odroid down so some signal is coming through the HDMI.
I can also see proper screen output in the SPI (when selecting the SSD for boot).
Tried now both the minimal latest ubuntu image with Kodi installed and the one with Mate Desktop. Same for both.
Also switching off the auto detection and defining a resolution/frequency via boot.ini (that I know is working) did bring me further.
It must be some kind of configuration issue I think but I don't know where to look further.

Hope someone can help me out.

Thanks, BR

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Re: N2 with Ubuntu - dark screen after boot

Unread post by odroid » Wed Feb 12, 2020 11:36 am

Do you have a HDR capable 4K TV?
What is the brand/model name of your display?

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Re: N2 with Ubuntu - dark screen after boot

Unread post by blissarts » Wed Feb 12, 2020 7:57 pm

Thanks for the fast reply.

No it's a 1080p capable model:
Toshiba 40TL968G

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Re: N2 with Ubuntu - dark screen after boot

Unread post by odroid » Thu Feb 13, 2020 10:33 am

Post your modified boot.ini file and we will try to find a possible solution.

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Re: N2 with Ubuntu - dark screen after boot

Unread post by blissarts » Thu Feb 13, 2020 5:56 pm

Hi,
I have tried several tweaks, but these two versions I still have that both did not work.
I want to highlight again that the screen and HW in general is working well since the default SD card Coreelec was working well.

Thank you, BR
Attachments
boot#2.ini
(4.66 KiB) Downloaded 9 times
boot.ini
(4.76 KiB) Downloaded 10 times

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Re: N2 with Ubuntu - dark screen after boot

Unread post by odroid » Thu Feb 13, 2020 6:07 pm

I couldn't find any clue in your boot.ini files. :(

I hope @joy or @tobetter can help you.

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Re: N2 with Ubuntu - dark screen after boot

Unread post by joy » Fri Feb 14, 2020 5:58 pm

Hi @blissarts,
I also checked your boot.ini files but, nothing strange because it works well when you try CoreElec from SD card booting. :roll:

1. Can you check if you have a normal display, Petitboot menu without USB storage connected?
If so, please share petitboot version information.

2. And I will reproduce it with my test environment, so could you share Coreelec image version that you're using?

3. One more question..
Is the HDMI cable kept connected during boot after power-on?

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Re: N2 with Ubuntu - dark screen after boot

Unread post by blissarts » Sat Feb 15, 2020 5:04 am

thx for the replay joy.
I want to highlight that the boot.ini is differnt for CoreElec as I have received it from Hardkernel together with the N2. I did not alter it by myself. And for the HK Ubuntu image the boot.ini is also provided by default (posted above). I am really not used to the bootloader config stuff...

1. Petitboot menu is shown at every startup. Version 20191213 (original version)
2. As I did not flash it myself I don't know. I think we need to ask the Hardkernel guy who prepared it ;)
3. yes. But I have tried both, keep it connected and connect it after startup

One very strange thing after I have done a full re-install with the ubuntu minimal: Once I could see kodi normally when starting it via kodi-standalone via ssh (because my actual screen is dark) after deleting the Addons27.db (I have found that somewhere else). But after that it was not reproducible any more so still dark screen.

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Re: N2 with Ubuntu - dark screen after boot

Unread post by blissarts » Sat Feb 15, 2020 6:44 am

I tried two more things:
1) install Debian Buster to my SSD => same issue as before
2) install Debian Buster to the SD card => it's working

So where is it going wrong when booting from SSD?
I mean the booting itself is OK since I can connect via SSH and do everything but just the difference for me seems to be the HDMI output.

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Re: N2 with Ubuntu - dark screen after boot

Unread post by joy » Sun Feb 16, 2020 10:03 am

Thank you for sharing the information, @bilssarts,
I will try to reproduce it early next week.

And can I ask one more?
To synchronize my HDMI timing property with your monitor's spec, could you share the following debug files?
(1) edid.bin
(2) display.bin

You can get the files from SD card booting.
- Boot from SD card
- "display_autodetect" option should be set as "true"

Code: Select all

setenv display_autodetect "true"
- The files will be generated in fat filesystem of your SD Card.

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Re: N2 with Ubuntu - dark screen after boot

Unread post by blissarts » Tue Feb 18, 2020 4:59 am

Hi,

here are the files:
Attachments
bin_files.zip
requested files
(596 Bytes) Downloaded 5 times
boot.ini
used boot.ini
(4.57 KiB) Downloaded 2 times

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Re: N2 with Ubuntu - dark screen after boot

Unread post by joy » Wed Feb 19, 2020 9:12 am

Thanks for sharing it.
Let me check this issue for a couple of days.

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