linux-kernel - Re: backlight: oops in __mutex_lock_slowpath during head /sys/class/graphics/fb0/* in 2.6.18

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Date:	Fri, 22 Sep 2006 13:26:22 +0200
From:	Olaf Hering <olaf@...fle.de>
To:	Michael Hanselmann <linux-kernel@...smi.ch>
Cc:	linux-kernel@...r.kernel.org,
	linux-fbdev-devel@...ts.sourceforge.net,
	"Antonino A. Daplas" <adaplas@....net>,
	Daniel R Thompson <daniel.thompson@...com>,
	Jon Smirl <jonsmirl@...il.com>, akpm@...l.org
Subject: Re: backlight: oops in __mutex_lock_slowpath during head /sys/class/graphics/fb0/* in 2.6.18

On Thu, Sep 21, Michael Hanselmann wrote:

> What about the patch below? Does it work for you?

Appears to work.

tangerine:~ # head /sys/class/graphics/fb0/*
==> /sys/class/graphics/fb0/bits_per_pixel <==
8

==> /sys/class/graphics/fb0/bl_curve <==
head: error reading `/sys/class/graphics/fb0/bl_curve': No such device

==> /sys/class/graphics/fb0/blank <==

==> /sys/class/graphics/fb0/console <==

==> /sys/class/graphics/fb0/cursor <==

==> /sys/class/graphics/fb0/dev <==
29:0

==> /sys/class/graphics/fb0/mode <==

==> /sys/class/graphics/fb0/modes <==
U:832x624p-74

==> /sys/class/graphics/fb0/name <==
valkyrie

==> /sys/class/graphics/fb0/pan <==
0,0

==> /sys/class/graphics/fb0/rotate <==
0

==> /sys/class/graphics/fb0/state <==
0

==> /sys/class/graphics/fb0/stride <==
832

==> /sys/class/graphics/fb0/subsystem <==
head: error reading `/sys/class/graphics/fb0/subsystem': Is a directory
head: cannot open `/sys/class/graphics/fb0/uevent' for reading: Permission denied

==> /sys/class/graphics/fb0/virtual_size <==
832,624


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