[Bug 1909171] Re: sddm-greeter segfault

[Remy]

Hi,

I'm also affected and these are the elements I could gather :
- When the system starts it's showing Lubuntu boot screen, then switches to black screen, then only displays the mouse pointer which I can move. But no other interactions possible. No login interface is loading after that.
I can press Ctrl Alt F4, log in and use startx which works fine.
- The message I have from sddm-greeter is (journalctl extract) :
janv. 19 22:50:20 melanie-cab sddm-greeter[813]: Connected to the daemon.
janv. 19 22:50:20 melanie-cab sddm[611]: Message received from greeter: Connect
janv. 19 22:50:22 melanie-cab kernel: sddm-greeter[813]: segfault at 0 ip 0000000000000000 sp 00007fff17b92968 error 14 in sddm-greeter[55fab6d63000+17000]
janv. 19 22:50:25 melanie-cab sddm-helper[801]: [PAM] Closing session

- Everything was fine before doing the following updates (see apt_history.log)
- Like @johndoe99 it's working correctly if I run in recovery mode (starting recovery mode with advanced tools, then selecting resume). I guessed this way it's setting the system to no GPU mode (GRUB nomodeset) and makes sddm working fine (but wait... no GPU ?? Means no 3D... no gaming... ;-).
- My graphics card is an ATI Radeon (based on the radeon driver). Check lshw_video.log for details.

Could it be coming from a problem with the interaction between sddm and
the radeon driver ?

** Attachment added: "apt update history which caused the problem"
   https://bugs.launchpad.net/ubuntu/+source/sddm/+bug/1909171/+attachment/5454695/+files/apt%20history.log

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Title:
  sddm-greeter segfault

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