next interesting finding: last time switching on my notebook I pressed
the wifi key before booting (during the bios init phase).
this caused another output for rfkill:
$ sudo rfkill list
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
and wifi was working! the very interesting thing is that the dell-wifi
entry is missing.
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WiFi Key doesn't work in Dell Studio 1557
https://bugs.launchpad.net/bugs/522545
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