[LAU] HDA-Intel headphone interrupt locking up kernel

Ken Restivo ken at restivo.org
Thu Jul 30 17:12:20 EDT 2009

Found a really fun one.

Plug in or unplug my headphone, and my computer locks up. This is with hda-intel with msi-enable.

Apparently the headphone plugging/unplugging generates an interrupt. I am using msi-enable. When the thing sleeps and comes back from sleep, sometimes the kernel, the BIOS, ACPI, and the snd-hda-intel driver aren't in agreement as to what IRQ the thing is on. Sometimes I end up with this:

 16:    1321610   IO-APIC-fasteoi   uhci_hcd:usb5, i915 at pci:0000:00:02.0, HDA Intel
218:          2      none-edge    
219:    3063329      none-edge    

I've got RT kernel, and the IRQ-219 is set to highest priority.

 1673 FF      85   - 125  0.2 S<   IRQ-219

 Now, if I am careless enough to generate an interrupt by plugging in the headphone, the system will lock-up, hard-core.

 I can avoid the problem by whacking the snd-hda-intel driver with a ball-peen hammer until it decides to go back onto the correct IRQ again:

 sudo modprobe -r snd-hda-intel
 sudo modprobe snd-hda-intel


 16:    1337804   IO-APIC-fasteoi   uhci_hcd:usb5, i915 at pci:0000:00:02.0
219:    3063459   PCI-MSI-edge      HDA Intel

And no problem.



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