When full composition pipeline is enabled in Nvidia's drivers, logging in causes the wallpaper to appear but nothing else happens. The mouse can be moved but no panels appear. Switching to another tty using ctrl+alt+f# and back makes the desktop appear normally. Full composition pipeline is Nvidia's solution to tear-free rendering, functionally the same as Mesa's tear free option. This might also be a multimonitor-specific issue. This is a long standing issue that used to have a simple workaround; removing the second monitor's location fields in $HOME/.config/xfce4/xfconf/xfce-perchannel-xml/displays.xml. This didn't change the monitors' relative location at all but fixed the login issue. However, this workaround stopped working after the introduction of the monitor setup profiles; now removing the location will make the second monitor mirror the first one (but it does at least fix the issue).
I was experiencing this issue on my desktop until recently I updated all Xfce components to git master then it was gone. Unfortunately I can't tell which component was causing it, perhaps xfwm4 or xfce4-session.
That looks like a driver issue, xfwm4 itself has nothing to do with tty. Which login manager do you use, lightdm, gdm, other?
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