linux-kernel - Re: Excessive WARN()s in Intel 915 driver

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Message-ID: <20140114090519.GP4770@phenom.ffwll.local>
Date:	Tue, 14 Jan 2014 10:05:20 +0100
From:	Daniel Vetter <daniel@...ll.ch>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Daniel Vetter <daniel@...ll.ch>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	intel-gfx <intel-gfx@...ts.freedesktop.org>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: Excessive WARN()s in Intel 915 driver

On Mon, Jan 13, 2014 at 03:16:42PM -0500, Alan Stern wrote:
> On Wed, 8 Jan 2014, Daniel Vetter wrote:
> 
> > On Wed, Jan 08, 2014 at 01:34:02PM -0500, Alan Stern wrote:
> > > On Wed, 8 Jan 2014, Daniel Vetter wrote:
> > > 
> > > > On Wed, Jan 08, 2014 at 11:08:08AM -0500, Alan Stern wrote:
> > > > > On Tue, 7 Jan 2014, Daniel Vetter wrote:
> > > > > 
> > > > > > I really want users to report these issues, and excessive WARNs seems
> > > > > > to be the only way to get those reports. Please boot with
> > > > > > drm.debug=0xe added to your kernel cmdline and reproduce this issues.
> > > > > > Also, which precise kernel are you running? Testing latest -rc is
> > > > > > always recommended, this state checker code is fairly new and gets
> > > > > > constantly extended and bugs fixed ...
> > > > > 
> > > > > Here you go.  This is the dmesg output after booting with
> > > > > drm.debug=0xe.  Pay no attention to the "AS" suffix in the version
> > > > > string; this is pristine 3.13-rc7.
> > > > 
> > > > That's strange, I've thought we've fixed the last struggling mismatch in
> > > > the lvds borber bits stuff. Can you please try latest drm-intel-nightly
> > > > from
> > > > 
> > > > http://cgit.freedesktop.org/~danvet/drm-intel/
> 
> I posted the output from the default branch in that repository last
> week:
> 
> 	http://marc.info/?l=linux-kernel&m=138922294308576&w=2

The default branch actually tends to be something stale, you need to
explicitly check out drm-intel-nightly ...

> Have you had time to look at the results yet?

It's marked on my todo, but unfortunately haven't gotten around to write
the patch yet (and analyze your log some more) ... I'll move it up the
prio list a bit.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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