On Fri, 2009-03-20 at 20:23 +0000, TomasHnyk wrote:
> But how it comes that when I boot up the computer wifi works? Is it set
> by bios, which is not used while resuming? So we need a driver that will
> emulate this bios behaviour?
> 
That's it precisely. For a cold-boot or return from hibernation the PC
goes through the BIOS power-on self test and configures the devices.

When doing suspend/resume all device state has to be saved by drivers
and restored on resume.

If acerhk implemented the RFKILL API the power-management system would
ensure that the state of the 'switch' was restored during resume.

-- 
Wireless (ipw2200) does not work after waking up from sleep(without manually 
switching on).
https://bugs.launchpad.net/bugs/53310
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