community/gdm - Xorg sessions cant start on /dev/tty7
Attempting to run an Xorg session from GDM will throw you right back to the login screen. This happens because Xorg server started by user does not have permission to access /dev/tty7 as the logs mention: Xorg.1.log
Workarounds:
- Switch to a VT2 and run
chown user /dev/tty7
as root And another side note: This does not happen with lightdm since it starts session on the same tty as the DM, and (maybe) even reuses DM's Xorg server. - Run a Wayland session and logout prior to logging in an Xorg session (/dev/tty7 remains owned by user after logout)