I've installed
Linux piBook 3.9.0-030900-generic #201304291257 SMP Mon Apr 29 16:58:15 UTC
2013 x86_64 x86_64 x86_64 GNU/Linux
now the high cpu load and dmesg spanning is gone, it looks like the device is
'propely' blocked now (even though the hardware switch is set to enable wifi,
but the device is a bit old, so I guess the switch isn't always working
properly anymore).
So this issue is fixed by switching to the latest upstream kernel.
However, when I plug in a USB wifi device, I still can't enable it
$ rfkill list
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: yes
1: phy1: Wireless LAN
Soft blocked: no
Hard blocked: no
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https://bugs.launchpad.net/bugs/1178841
Title:
[regression] iwl3945 0000:04:00.0: Radio disabled by HW RF Kill switch
- wpa_supplicant causes high cpu load -
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