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System: running KDE Neon (*buntu 20.04) desktop with an NVidia 1050 GPU.
Symptom: intermittently hanging before the graphical login screen (sddm). However, I was able to switch to tty6 and repair the system from the cli.
The error that sddm gave was:
Failed to read display number from pipe
It seems like on fast machines, the boot process can try to start sddm before the graphics driver is fully loaded. Bug here:
https://github.com/sddm/sddm/issues/1316
I downgraded from sddm 0.19.0 to 0.18.1 and it now seems to be working. I hope this might help others.
Last edited by no_information_here on 9 March 2021 at 10:35 pm UTC
I don't know about this 'fast machines' theory... maybe my 8700k booting from a nvme drive isn't fast enough.
Interesting. That is certainly a fast machine.
It was so intermittent for me, it took quite a while to figure out. I think very small differences in the bootup sequence were affecting it since it only happened about 50% of the time.
I am glad that it is not an issue for you.
I wanted to follow up here in case anyone stumbles on my post from last year. The comment above was a symptom and not the actual cause. My system was confused into trying the onboard Intel GPU before switching to the Nvidia GPU. The problem was fixed by completely disabling the Intel GPU in the bios. A minor side effect is that my (Intel) audio often takes an extra minute to engage after getting to the desktop, but I can live with that.
Not sure if the main problem was a Dell bios issue, or something in the Nvidia driver bootup sequence.