linux-kernel - Re: i915: 3.1.0-rc3+: WARNING: at fs/sysfs/dir.c:455 sysfs_add

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Date:	Sat, 27 Aug 2011 10:04:43 -0300
From:	Lucas De Marchi <lucas.de.marchi@...il.com>
To:	Sergei Trofimovich <slyich@...il.com>
Cc:	Matthew Garrett <mjg@...hat.com>, linux-kernel@...r.kernel.org,
	Chris Wilson <chris@...is-wilson.co.uk>,
	David Airlie <airlied@...ux.ie>,
	dri-devel@...ts.freedesktop.org, Keith Packard <keithp@...thp.com>
Subject: Re: i915: 3.1.0-rc3+: WARNING: at fs/sysfs/dir.c:455 sysfs_add_one+0xb8/0xf0()

Hi Sergei,

On Fri, Aug 26, 2011 at 17:30, Sergei Trofimovich <slyich@...il.com> wrote:
> Around -rc2+ i've noticed the following warning in dmesg [1]
>
>> WARNING: at fs/sysfs/dir.c:455 sysfs_add_one+0xb8/0xf0()
>> sysfs: cannot create duplicate filename '/devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight'
>
> It tries to register backlight twice, so fails miserably.
> The machine is compaq-2510p with 965GM.
>
> Reverting commit aaa6fd2a004147bf32fce05720938236de3361d9 helps.
> ("Not all systems expose a firmware or platform mechanism for changing
> the backlight intensity on i915,  so add native driver support.")
>
> Attached dmesg before reverting the patch and after.
>

There's another patch that fixes this issue:

https://patchwork.kernel.org/patch/1086232/

regards,
Lucas De Marchi
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