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Topic: external monitor not detected after kernel update & reboot (Read 685 times) previous topic - next topic
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external monitor not detected after kernel update & reboot

I just did a global upgrade, working on an external 4K display as usual.
After reboot, this display is no more visible or usable: Not detected!

I am using LTS kernel :
uname -r
5.4.84-1-lts

running xrandr only list the laptop's display.
When I plug in and out the USB plug, signal  is still detected (I can see the blue led).

Someone have hints on troubleshooting this issue?

Re: external monitor not detected after kernel update & reboot

Reply #1 –
downgrade fix your problem? can you try newest kernel 5.10 from testing? 5.10 is new LTS too.

Re: external monitor not detected after kernel update & reboot

Reply #2 –
I tried non LTS kernel = 5.9.14-artix1-1 => same issue.
So I will try with downgrade prior to jumpign to testing

thanks for the answer

Re: external monitor not detected after kernel update & reboot

Reply #3 –
Ok, I tried booting on a live USB, on an 2019 artix image, there is the same problem.
So apparently it is the HDMI plug that must be dead. It happened all of the sudden, after a reboot.
But It always happens all of the sudden. That's the way it is.
So it is not about the kernel, it is about the HW.