Wireless hotkey on Dell XPS 15 9550 has no function

[Nara Huang]

Title: Wireless hotkey on Dell XPS 15 9550 has no function

Summary:
When pressing wireless hotkey, nothing happens.
Observing "rfkill list", both wifi and bluetooth are not disabled by hotkey.

Steps: 1. Press wireless hotkey (Fn + PrtScr)

Expected results: Wireless hotkey could disable/enable Wireless devices.

Actual results: Wireless hotkey does nothing

Additional information:
Ubuntu 16.04 LTS
Unit: XPS 15 9550
Wifi/BT:
Device: 02:00.0
Class: Network controller [0280]
Vendor: Broadcom Corporation [14e4]
Device: BCM43602 802.11ac Wireless LAN SoC [43ba]
SVendor: Dell [1028]
SDevice: BCM43602 802.11ac Wireless LAN SoC [0020]
Rev: 01

CPU: Intel(R) Core(TM) i7-6700HQ CPU @ 2.60GHz (8x)

GPU: 00:02.0 VGA compatible controller: Intel Corporation HD Graphics 530 (rev 06)

Manufacturer: n/a

ProductName: n/a

BiosVersion: n/a

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1589883/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]

[Cruz Fernandez (cruz-fernandez)]

I'm seeing this in dmesg when pressing the key:

[jun14 21:16] dell_wmi: Unknown key 153 pressed