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Old 04-07-2005, 04:12 AM   #1
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Can irq conflicts still happen?

I'm having a problem with my D-Link DWL g650 wireless card. After it is inserted in my laptop it works fine for a few minutes and then the laptop freezes completely. I'm using the madwifi drivers.

cat /proc/interrupts shows that there are two "yenta", the Radeon graphics
card and ath0 (the nic) on irq 16. Furthermore, if i call ifup on my wired nic,
this is also assigned to irg 16, so that's a total of 5 modules on 1 irq!
I've had the laptop running with the wireless nic for a whole day without
problems, and I noticed that in /proc/interrupts it was listed before the Radeon
in sequence; normally when it locks up it is listed last. Does this have any significance?

Any good ideas on how to resolve this freezing problem?
Old 04-07-2005, 05:13 AM   #2
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You could disable PNP in the BIOS. That tends to let linux read the IRQ's and assign them properly.
Old 04-07-2005, 05:23 AM   #3
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There is no option for non-pnp OS in the bios. It is a cardbus nic, so it should be handled by the hotplug system. Is there a way to tell
hotplug to prefer or exclude certain irqs for its devices or is this simply not possible?
Old 04-07-2005, 10:38 AM   #4
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Thumbs up

Problem solved. I tried things like changing the order of module loading and giving pci arguments to the kernel, but this was not the problem at all. I started looking at the network setup and changed the channel of my wireless ad-hoc network to 9 instead of 1, and that
made all the difference. No more lock-ups. So after all the laptop was handling the devices fine even though they were using the same irq.
Why using channel 1 made the whole system freeze I just can't get my head around, but now it just works
Old 04-07-2005, 01:17 PM   #5
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Thanks for posting back with the solution that worked for you kjeldsen, and congrats on solving the problem. This will be a big help to future readers who might encounter the same issue -- J.W.

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