Armbian on my BPM1: video output not working properly

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For some weeks now my BPM1 behaves a bit strange concerning video output. I used to connect my Banana to my monitor via a HDMI-DVI cable, which worked well for a very long time. Now, when I reboot the system, my monitor says "no signal", when I use that cable, as it does also when I use a pure HDMI-HDMI cable.


The only way to make the Banana's video output work, is by using a HDMI-DSUB converter.


But here comes the even stranger mystery: after I booted the Banana, using that converter, I can change the cable to whatever I want: HDMI-HDMI or HDMI-DVI, they both suddenly work again! But if I reboot the Banana again, not using the HDMI-DSUB converter, the screen stays black again.


Like I said: that is not the way it used to be! I can not really recall when this strange behaviour started, but I assume that some kernel boot parameters have changed in one of the latest kernel versions. For now, the Banana is running


Linux pi 5.4.88-sunxi #21.02.2 SMP Sun Feb 14 21:05:18 CET 2021 armv7l GNU/Linux

and I have been using the 5.4 line for quite some time now, without any problems.


If anyone have an explanation or even a solution for this strange video behaviour I'd be glad to hear it. I know I could simply go on using the HDMI-DSUB converter, but that input channel on my monitor is needed for another machine. So I am really looking for a way to make that HDMI-DVI cable work again.


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The command "nand-sata-install" has to be run from sdcard, but my Banana's system is running from an SSD. If repairing the HDMI port would mean to reinstall the whole system, I'd rather pass that one and live with a non functioning HDMI port.


Is there any other way of getting the port to work again? What about special boot parameters?

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