linux-kernel - Re: [Intel-gfx] [WARNING 4.1-rc2] i915: Unclaimed register detected before writing to register 0xc4040

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Message-ID: <20150508125701.58ac46d0@gandalf.local.home>
Date:	Fri, 8 May 2015 12:57:01 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Daniel Vetter <daniel@...ll.ch>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Daniel Vetter <daniel.vetter@...el.com>,
	intel-gfx <intel-gfx@...ts.freedesktop.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: [Intel-gfx] [WARNING 4.1-rc2] i915: Unclaimed register detected
 before writing to register 0xc4040

On Fri, 8 May 2015 12:18:10 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> On Fri, 8 May 2015 12:08:31 -0400
> Steven Rostedt <rostedt@...dmis.org> wrote:
> 
> 
> > Maybe it's my bios still (it is an older box). I'll just block out
> > compiling in SND_HDA_INTEL, so that it doesn't break my tests (they
> > fail on a WARNING).
> 
> Hmm, right after I posted this I triggered the Call Trace again with 
> 
> # CONFIG_SND_HDA_INTEL is not set
> 
> :-/
> 
> Now to figure out how to keep this from triggering. I may just keep
> adding a patch to hide that warning.
> 

Oh, I forgot to mention, that before the Call Trace, I get theses:


[  673.093330] [drm:intel_uncore_check_errors] *ERROR* Unclaimed register before interrupt
[  673.103206] [drm:intel_uncore_check_errors] *ERROR* Unclaimed register before interrupt
[  673.139252] [drm:intel_uncore_check_errors] *ERROR* Unclaimed register before interrupt
[  673.151323] [drm:ivybridge_set_fifo_underrun_reporting] *ERROR* uncleared fifo underrun on pipe A
[  673.160745] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe A FIFO underrun

Mean anything?

-- Steve
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