Permission error while locking the device when writing to QSerialPort

[Lesiok]

Try in system console this command : ls /dev/tty*
Here is output from my system :

crw-rw-rw- 1 root tty     5,  0 06-01 22:06 /dev/tty
crw--w---- 1 root tty     4,  0 06-01 22:06 /dev/tty0
crw------- 1 root root    4,  1 06-01 22:08 /dev/tty1
crw--w---- 1 root tty     4, 10 06-01 22:06 /dev/tty10
crw--w---- 1 root tty     4, 11 06-01 22:06 /dev/tty11
crw--w---- 1 root tty     4, 12 06-01 22:06 /dev/tty12

crw-rw-rw- 1 root tty     5,  0 06-01 22:06 /dev/tty
crw--w---- 1 root tty     4,  0 06-01 22:06 /dev/tty0
crw------- 1 root root    4,  1 06-01 22:08 /dev/tty1
crw--w---- 1 root tty     4, 10 06-01 22:06 /dev/tty10
crw--w---- 1 root tty     4, 11 06-01 22:06 /dev/tty11
crw--w---- 1 root tty     4, 12 06-01 22:06 /dev/tty12

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As You see only root and tty group have permision to use tty devices.
A problem with system configuration not with application.