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To uninstall the AMD driver : sudo aticonfig --uninstall That should make it.


I found the answer here: https://www.archlinux.org/news/xorg-server-116-is-now-available/ X is now rootless with the help of systemd-logind, this also means that it must be launched from the same virtual terminal as was used to log in, redirecting stderr also breaks rootless login. The old root execution behavior can be restored through the ...


xhost +SI:localuser:lightdm allows the lightdm user to access the running X server. The current X server is indicated by the DISPLAY environment variable. The manpage has reasonably good explanations: [+]name The given name (the plus sign is optional) is added to the list allowed to connect to the X server. The name can be a host ...

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