How to trigger.
***WARNING: Save everything before trying this.***
With a Gnome Classic session. There is a 4 screen multi screen selector
on the panel at the bottom of the screen organized as 2 rows of 2
screens. It has a preferences dialog acessable via a right click when
on an empty space on it. Bring it up. Notice that the number of rows
and screens are both 1 and don't match the layout and number of
multiscreens on the selector in the pannel. Just change the number of
screens to 8, leave the number of rows as 1, likely any number of
screens more than one will work. Notice you get a single row of screens
shown. Now click on any one of those screens shown other than the
currently active one. All of your windows will now vanish as well as
the dialog and pannels. Programs are still running. Contrl-Alt-F1 will
still bring up the text console you can use to login and kill -HUP
your Gnome Classic session. Altenately you can login over the net to do
the same.
Only workoround I've found sofar is not to change anything in that
dialog.
For an experiment I did a kill -HUP on gnome-panel rather than the
root of the login session and the panels came back, and then clicked on
one of the other multi-screens and the same vanishing issue happened
again. Also a second hangup killing and gnome-panel was gone.
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https://bugs.launchpad.net/bugs/1017382
Title:
Multi-screen options failure under Gnome Classic
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https://bugs.launchpad.net/ubuntu/+source/gnome-panel/+bug/1017382/+subscriptions
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