On Fri, Mar 15, 2013 at 8:14 AM, Jiri Kosina <jkosina@xxxxxxx> 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? -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
