Comment 66 for bug 1288572

One more weird problem. After I reload gnome-shell by using Alt+F2 -- r, and then reboot the system. Login to gnome-shell becomes black screen. Even if with black screen, gnome-shell is actually working, this is because if I do "ctrl+alt+T" blindly to open a terminal and then press "Backspace" button, I can hear the beep sound even if I can only see a black screen. And then I tried to switch to "Ctrl+Alt+F1" virtual console. and switch back to "Ctrl+Alt+F7". The screen display is not updated. (I am not sure how to express this clearly in English. VT7 shows VT1 screen capture. The screen display is not updated. something like this). And then I keep switching btw VT1 and VT7. Suddently, gnome-shell appears after many switches. I can reproduce this behavior many times after rebooting the machine. Hopefully, my words make sense.