rfkill unblock all does not activate a certain wireless card

Question

With an intel 1000 wireless card;

rfkill list
    0: acer-wireless: Wireless LAN
    Soft blocked: yes
    Hard blocked: no
    1: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
    2: tpacpi_bluetooth_sw: Bluetooth
    Soft blocked: yes
    Hard blocked: no

rfkill unblock all
    0: acer-wireless: Wireless LAN
    Soft blocked: yes
    Hard blocked: no
    1: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
    2: tpacpi_bluetooth_sw: Bluetooth
    Soft blocked: no
    Hard blocked: no
    3: hci0: Bluetooth
    Soft blocked: no
    Hard blocked: no

Why does my wireless card not turn on?

Answer 1

This is not invented by me, but credited to answers from others in the web. Thanks to them.

Initial problem:

Bought new Sony Vaio E Series. Installing using CD, Ubuntu 12.04. During installation wireless works. After reboot NO!. Can not enable wireless.

On Dharmendra's Linux Diary, I found:

rfkill list all
rfkill unblock all

rfkill list shows that everything works, and shows soft blocking in 'acer-wireless: Wireless LAN, soft blocked: yes`.

rfkill unblock all does not manage to change. After another rfkill list all, same status remains.

Then I learned:

sudo modprobe -r acer_wmi

It works. Wireless Networks works 'normal' as it should be.