I've found solution on arch wiki:
For iwl3945, iwl4965 and iwl5000-series
Note: This works with the iwlegacy and iwlwifi drivers.
The default settings on the module are to have the LED blink on activity. Some people find this extremely annoying. To have the LED on solid when Wi-Fi is active, you can use the systemd-tmpfiles:
/etc/tmpfiles.d/phy0-led.conf
w /sys/class/leds/phy0-led/trigger - - - - phy0radio
Run systemd-tmpfiles --create phy0-led.conf for the change to take effect, or reboot.
To see all the possible trigger values for this LED:
# cat /sys/class/leds/phy0-led/trigger
Tip: If you do not have /sys/class/leds/phy0-led, you may try to use the led_mode="1" module option. It should be valid for both iwlwifi and iwlegacy drivers.
Sounds like the device is suppose to connect when its connected. – Ramhound – 2013-10-03T12:11:34.353
Yes, but it is OK in windows. I tried to add a file iwl_blink.conf in /etc/modprobe.d/ and the content is " options iwlcore led_mode=1 " but failed – user1179442 – 2013-10-03T12:22:39.910