external monitor not detected after kernel update & reboot 20 December 2020, 15:20:58 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 -r5.4.84-1-ltsrunning 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 – 20 December 2020, 15:26:33 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 – 20 December 2020, 18:37:38 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 – 20 December 2020, 19:40:14 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.