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Warning: no login screen after sddm upgrade (KDE)
Normally, my KDE Plasma system has been very stable. However, I just tracked a difficult bug and wanted to warn others.

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
dpanter 10 Mar
Been using sddm 0.19.0 on Siduction since the beginning of November and haven't seen any issues. System autologins to a KDE Plasma X session. Been using both AMD and Nvidia GPU's.

I don't know about this 'fast machines' theory... maybe my 8700k booting from a nvme drive isn't fast enough.
Quoting: dpanterBeen using sddm 0.19.0 on Siduction since the beginning of November and haven't seen any issues.

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.
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