No HDMI Signal on first boot. Reboot required!!!

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wallyz21
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No HDMI Signal on first boot. Reboot required!!!

Unread post by wallyz21 » Mon Aug 12, 2019 8:16 pm

For a short time now. About two kernel upgrades ago my N2 began requiring two boots before I get a HDMI signal.

On the first boot my monitor shows a connection warning "Invalid signal detected. Check output device."

If I ssh in and reboot or power cycle everything is then fine.

Any ideas?

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Re: No HDMI Signal on first boot. Reboot required!!!

Unread post by rooted » Mon Aug 12, 2019 11:47 pm

Even from a cold boot? Like after removing the power plug.

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Re: No HDMI Signal on first boot. Reboot required!!!

Unread post by wallyz21 » Tue Aug 13, 2019 7:43 pm

rooted wrote:
Mon Aug 12, 2019 11:47 pm
Even from a cold boot? Like after removing the power plug.
Yes.

It's strange because I have to unplug the N2 on the first and second boot but the HDMI is not working on the first boot.

I only have a HD monitor could it be confused and be outputing to a 4K monitor???

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Re: No HDMI Signal on first boot. Reboot required!!!

Unread post by odroid » Wed Aug 14, 2019 9:24 am

What is the native resolution of your monitor?

If your monitor has an EDID auto-detection issue in the first booting process, disable the auto mode and set the resolution manually by editing /media/boot/boot.ini file.
https://github.com/mdrjr/n2_bootini/blo ... oot.ini#L7

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Re: No HDMI Signal on first boot. Reboot required!!!

Unread post by wallyz21 » Wed Aug 14, 2019 10:36 am

odroid wrote:
Wed Aug 14, 2019 9:24 am
What is the native resolution of your monitor?

If your monitor has an EDID auto-detection issue in the first booting process, disable the auto mode and set the resolution manually by editing /media/boot/boot.ini file.
https://github.com/mdrjr/n2_bootini/blo ... oot.ini#L7
HD (1920x1080) I already mentioned!

I'll have a play with the boot.ini and see what happens. Strange that it auto detects on the second boot!

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Re: No HDMI Signal on first boot. Reboot required!!!

Unread post by odroid » Wed Aug 14, 2019 10:59 am

Sorry. I thought HD is 1280x720 and Full-HD is 1920x1080.

Anyway, is it a native HDMI input or DVI/VGA input?
Which kernel version do you run?

Code: Select all

root@odroid:~# uname -a                                                         
Linux odroid 4.9.187-53 #1 SMP PREEMPT Fri Aug 9 06:12:18

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Re: No HDMI Signal on first boot. Reboot required!!!

Unread post by wallyz21 » Thu Aug 15, 2019 3:10 pm

odroid wrote:
Wed Aug 14, 2019 10:59 am
Sorry. I thought HD is 1280x720 and Full-HD is 1920x1080.

Anyway, is it a native HDMI input or DVI/VGA input?
Which kernel version do you run?

Code: Select all

root@odroid:~# uname -a                                                         
Linux odroid 4.9.187-53 #1 SMP PREEMPT Fri Aug 9 06:12:18
Connection is via the HDMI port.

I keep the kernel updated to the latest so it should be at the latest (I'm not in front of the N2 at the moment so can't check but i remember a couple of kernel updates coming through during the last week).

I've also noticed I can no longer turn on my N2 via HDMI-CEC (which it used to do)!

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Re: No HDMI Signal on first boot. Reboot required!!!

Unread post by elatllat » Sun Aug 18, 2019 12:26 pm

HD is one of those terms marketing got ahold of and should consequently never be used again. 1080p,60Hz,4:4:4,10bit,1m:1 contrast,90% P3 Gamut,etc gets a bit long though.

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