Touble getting ath5k wifi working on Ubuntu 11.10

[Nils Kassube]

Sorry for the late reply.

Jan Mostert wrote:
> Doing a "sudo iwlist wlan0 scan" just says no results found (that's
> after shutting it down and bringing it up again, otherwise it
> doesn't scan).
> 
> Some snippets of the dmesg output, error message in error log "wlan0:
> link is not ready":

> [   16.332310] ath5k 0000:09:02.0: PCI INT A -> GSI 21 (level, low)
> -> IRQ 21
> [   16.332396] ath5k 0000:09:02.0: registered as 'phy0'


> [  762.161704] ath5k phy1: Atheros AR2413 chip found (MAC: 0x78, PHY:
> 0x45)
> [  763.928517] irq 21: nobody cared (try booting with the "irqpoll"
> option)

> [  763.928531] Call Trace:
> [  763.928543]  [<c151a3f2>] ? printk+0x2d/0x2f
> [  763.928553]  [<c10aad49>] __report_bad_irq+0x29/0xd0
> [  763.928565]  [<f8511dc8>] ? ath5k_hw_is_intr_pending+0x18/0x20
> [ath5k]

To me it looks like a bug in the ath5k module. The module registered
IRQ21 for ath5k and then doesn't handle that IRQ for some reason. I
suppose that is the reason why you can't use your wifi. I think you
should report this bug:
<https://wiki.ubuntu.com/KernelTeam/KernelTeamBugPolicies>.

Until this problem is resolved, you could try ndiswrapper (as you
suggested in the other mail) if you have the Windows driver for that
Atheros card. Or you could try the kernel of the upcoming 12.04 version.
Perhaps the bug is resolved there already. You can find that kernel
here:
<http://packages.ubuntu.com/search?keywords=linux-image&searchon=names&suite=precise&section=all>


Nils