I have noticed I can't lock the screen because of vlock hangs.chvt also hangs on VT_WAITACTIVE and only attempts to switch the terminal (I see the image blinking).Pressing keys that in usually switches VT in text mode (Alt+arrows, Alt+Fx) also makes Xorg picture blink and hide cursor for a second. The keyboard input also flows to text console in addition to Xorg. I noticed a stray session at tty2. I can log in to tty2 without leaving Xorg:# ps aux | grep qwjerewqrvi       27051  0.0  0.0   3644  1144 tty2     S+   20:38   0:00 grep qwjerewqrroot     27053  0.0  0.0   3644  1236 pts/27   SN+  20:38   0:00 grep qwjerewqrSo,What may have caused this?How do I bring the system back to normal without rebooting (or restarting X applications)?Shall I report a bug report somewhere? Update: Finally just rebooted it (because of other unrelated problem).
Why can't I switch virtual terminal now?
linux;xorg;chvt