You can sign up to get a daily email of our articles, see the Mailing List page!
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:

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.
While you're here, please consider supporting GamingOnLinux on:

Patreon, Liberapay or PayPal Donation.

This ensures all of our main content remains totally free for everyone with no article paywalls. We also don't have tons of adverts, there's also no tracking and we respect your privacy. Just good, fresh content. Without your continued support, we simply could not continue!

You can find even more ways to support us on this dedicated page any time. If you already are, thank you!
Login / Register

Or login with...
Sign in with Steam Sign in with Twitter Sign in with Google
Social logins require cookies to stay logged in.