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I went to a CentOS terminal, and someone was logged in doing work. I hit Ctrl+Alt+F2 to try to get to my own session so I could check something. When I hit Ctrl+Alt+F1 to get back, X did not come back up and gave a bunch of error messages.

Is this a bug? Did that other user just lose all the work they had running? It seems like if I had to kill all X and do a startx again, he would lose everything running in the terminals and other GUI apps, right?

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I admittedly know nothing about CentOS, but usually F1 through F6 are reserved for TTYs; X sessions don't start until F7. Hitting Ctrl+Alt+F7 should get you back to the first X session

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May possibly be Ctrl+Alt+F5 as well (: depends, depends. – gabe. Feb 10 '11 at 1:32

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