It would be useful to find out why gdm3 works for you but lightdm does
not. It might be because gdm3 defaults to Wayland not Xorg, or it might
be a difference in the greeter/login screen itself. To find out, please
try editing /etc/gdm3/custom.conf and change:
#WaylandEnable=false
to
WaylandEnable=false
then reboot.
Does gdm3 still work now it's using Xorg?
** Tags added: radeon
** Summary changed:
- Failure to pass system check and present login screen
+ [radeon] Failure to pass system check and present login screen
** Package changed: xorg (Ubuntu) => xorg-server (Ubuntu)
** Changed in: xorg-server (Ubuntu)
Status: New => Incomplete
** Also affects: lightdm (Ubuntu)
Importance: Undecided
Status: New
** Changed in: lightdm (Ubuntu)
Status: New => Incomplete
** Also affects: unity-greeter (Ubuntu)
Importance: Undecided
Status: New
** Changed in: unity-greeter (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1913855
Title:
[radeon] Failure to pass system check and present login screen
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