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Atheros AR9485 receiving error -5 in init

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Hello,

Recently I changed the laptop, and there's something wrong with the new
Wifi adapter, which is an Atheros AR9485. Now, when I do modprobe ath9k,
a message like this is registered in dmesg:

  ath9k: probe of 0000:04:00.0 failed with error -5

The OS installed in that machine is a Slackware 13.37 with the stock
kernel. I've tried, following some google research, using the
compatibility backport kit. I've downloaded some versions, but now I
stick with compat-wireless-3.5.3-2-sn in order to eliminate variables.

After some turns, I've put some printk() in
drivers/net/wireless/ath/ath9k/hw.c, and my final conclusion is that the
time is running out in the routine ath_hw_wait() when waiting for the
register 0x7044 have some value, like showed by one message raised by
one of the printk() inserted in the code:

  ath9k_hw_wait(): ret=0(timeout (100000 us) on reg 0x7044: 0xffffffff &
  0x0000000f != 0x00000002)

That is, the register has 0xffffffff, that when masked with 0x0f leads
to 0x0f, which is not the expected value 0x02.

There's also one key combination (Fn-F12), which seems to enable/disable
the wifi adapter, but it seems not to change anything.

(I think I would not mention that with Windows everything works, but
this may be a concern in a first level of analysis. Please don't
flame...).

Please could someone give me some hint?

Thanks,

Luiz Ramos
São Paulo - Brazil
lramos dot prof at yahoo dot com dot br
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