Mario thanks a lot for debugging and fixing this. Everything mostly
works now, just a small nitpick remaning:

I start w/ killswitch off (0), then switch BT off by software (1), the
BT indicator LED turns off. Then I turn killswitch on (2) and off again
(3); now the BT indicator turns on again although BT is disabled by
software.

Below the output of dmesg corresponding to the numbers in parentheses
above:

(1)
[  988.413286] dell_rfkill_query called for radio 2.
[  988.414263]  Query returned the following raw data:
[  988.414267]  00000000 00000001 00000011 00011111
[  988.414692]  Second query returned the following raw data:
[  988.414695]  00000000 00000000 00000001 00000010
[  988.414746] HW switch status is set to following raw data:
[  988.414749]  00000000 00000000 00000000 00000010
[  988.414799]  Setting HW state to 0.
[  988.414806] dell_rfkill_set called for radio 2, to set 1
[  988.449141] usb 3-2: USB disconnect, address 13
[  988.449310] btusb_intr_complete: hci0 urb f22c5c00 failed to resubmit (19)
[  988.449329] btusb_bulk_complete: hci0 urb f22c5f00 failed to resubmit (19)
[  988.450317] btusb_bulk_complete: hci0 urb f22c5000 failed to resubmit (19)


(2)
[ 1037.678566] dell_rfkill_update called.
[ 1037.678575]  Toggling HW state for bt

(3)
[ 1066.386140] dell_rfkill_update called.
[ 1066.386149]  Toggling HW state for bt
[ 1066.897077] usb 3-2: new full speed USB device using uhci_hcd and address 14
[ 1067.083438] usb 3-2: configuration #1 chosen from 1 choice


Also the corresponding 'rfkill list' outputs:

(0)
0: dell-wifi: Wireless LAN
        Soft blocked: no
        Hard blocked: no
1: dell-bluetooth: Bluetooth
        Soft blocked: no
        Hard blocked: no
2: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
16: hci0: Bluetooth
        Soft blocked: no
        Hard blocked: no

(1)
0: dell-wifi: Wireless LAN
        Soft blocked: no
        Hard blocked: no
1: dell-bluetooth: Bluetooth
        Soft blocked: yes
        Hard blocked: no
2: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no

(2)
0: dell-wifi: Wireless LAN
        Soft blocked: no
        Hard blocked: no
1: dell-bluetooth: Bluetooth
        Soft blocked: yes
        Hard blocked: yes
2: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no

(3)
$ rfkill list
0: dell-wifi: Wireless LAN
        Soft blocked: no
        Hard blocked: no
1: dell-bluetooth: Bluetooth
        Soft blocked: yes
        Hard blocked: no
2: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
17: hci0: Bluetooth
        Soft blocked: yes
        Hard blocked: no

-- 
[Dell Latitude D430, iwl3945] Wireless can't be activated after disabling kill 
switch
https://bugs.launchpad.net/bugs/430809
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