I did additional testing with unmodified kernel. Mainline kernel test will be done in the next days.
Within a real termianl Ctrl+Alt+F2 i was not able to reproduce the failure. I used internal keyboard of my Gigabyte T1005 and an external USB-Keyboard. I recognized different delay and repeat-key behaviour of USB- and internal keyboard.
Within a "gui"-terminal of xfce i reproduced the failure with the internal keyboard multiple times. With the external USB keyboard i was not able to reproduce it (but no proof that it will not happen).
I did additional testing with unmodified kernel. Mainline kernel test will be done in the next days.
Within a real termianl Ctrl+Alt+F2 i was not able to reproduce the failure. I used internal keyboard of my Gigabyte T1005 and an external USB-Keyboard. I recognized different delay and repeat-key behaviour of USB- and internal keyboard.
Within a "gui"-terminal of xfce i reproduced the failure with the internal keyboard multiple times. With the external USB keyboard i was not able to reproduce it (but no proof that it will not happen).
Maybe this information will help.