My laptop is an Acer 1810T. I see this error message each boot.

Kind regards Thomas

Jiri Kosina jkosina@suse.cz schrieb:

On Fri, 15 Mar 2013, Jiri Kosina wrote:

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I have the same problem on my Lenovo T500. I think the graphics card is involved.

This laptop has "hybrid graphics" - one Intel GMA 4500MHD and one ATI Mobility Radeon HD 3650. When I boot with the Intel card, I get "irq 16: nobody cared" during boot, not when I boot with the ATI card.

Confirming this. After a lot of hassle, I have bisected this reliably to

commit 28c70f162a315bdcfbe0bf940a740ef8bfb918d6 Author: Daniel Vetter daniel.vetter@ffwll.ch Date: Sat Dec 1 13:53:45 2012 +0100

   drm/i915: use the gmbus irq for waits

Adding Daniel, Imre and Daniel to CC while I will try to figure out what's happening in parallel.

Attaching dmesg.txt from the machine with 28c70f162a as head, with drm.debug=0xe.

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.

-- Jiri Kosina SUSE Labs