Messages in this thread | | | Date | Fri, 15 Mar 2013 12:14:28 -0700 | Subject | Re: [3.9-rc1] irq 16: nobody cared (was [3.9-rc1] very poor interrupt responses) | From | Yinghai Lu <> |
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On Fri, Mar 15, 2013 at 8:14 AM, Jiri Kosina <jkosina@suse.cz> wrote:
> Just a datapoint -- I have put a trivial debugging patch in place, and it > reveals that "nobody cared" for irq 16 happens long after last > > I915_WRITE(GMBUS4 + reg_offset, 0); > > has been performed in gmbus_wait_hw_status(). On the other hand, if I > comment out both GMBUS4 register offset writes in gmbus_wait_hw_status(), > then it of course falls back to GPIO bit-banging, but the "nobody cared" > for irq 16 is gone. > > So it seems like something gets severely confused by the I915_WRITE to > GMBUS4 + reg_offset. So far this seems to have been reported solely on > Lenovos as far as I can see (although a completely different types), so it > might be some platform-specific quirk? > > Honestly, I still don't understand how all the GMBUS stuff relates to IRQ > 16 at all.
that device is using i915 0000:00:02.0: irq 44 for MSI/MSI-X
so can you try to boot with pci=nomsi?
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