Re: mmotm 2011-03-02 - ACPI/sysfs WARNING with NVidia graphics card

From: Greg KH
Date: Thu Mar 03 2011 - 19:12:26 EST

On Thu, Mar 03, 2011 at 06:50:41PM -0500, Valdis.Kletnieks@xxxxxx wrote:
> On Wed, 02 Mar 2011 16:52:55 PST, akpm@xxxxxxxxxxxxxxxxxxxx said:
> > The mm-of-the-moment snapshot 2011-03-02-16-52 has been uploaded to
> >
> > http://userweb.kernel.org/~akpm/mmotm/
>
> Dell Latitude E6500, with an NVidia G98M (Quadro NVS 160M) graphics card.
>
> Seen in my dmesg - it's had the 'Firmware Bug' message for roughly forever, but
> apparently somewhere recently a warning crawled in. 2.6.38-rc5-next-20110222
> did not throw the warning, jsut the firmware bug msg.
>
> Hope somebody recognizes it, I won't be able to bisect this one for a bit (I
> have 2 or 3 other things I have a bigger need to track down).
>
> [ 0.784712] ACPI: Sleep Button [SBTN]
> [ 0.816626] ------------[ cut here ]------------
> [ 0.816633] WARNING: at fs/sysfs/dir.c:455 sysfs_add_one+0x88/0x9c()
> [ 0.816635] Hardware name: Latitude E6500
> [ 0.816637] sysfs: cannot create duplicate filename '/devices/pci0000:00/0000:00:01.0/0000:01:00.0/backlight/acpi_video0/device'
> [ 0.816640] Modules linked in:
> [ 0.816645] Pid: 1, comm: swapper Not tainted 2.6.38-rc7-mmotm0302 #2
> [ 0.816647] Call Trace:
> [ 0.816652] [<ffffffff8103899e>] ? warn_slowpath_common+0x7e/0x96
> [ 0.816657] [<ffffffff81038a4a>] ? warn_slowpath_fmt+0x41/0x43
> [ 0.816661] [<ffffffff8114d876>] ? sysfs_add_one+0x88/0x9c
> [ 0.816665] [<ffffffff8114e06e>] ? sysfs_do_create_link+0x145/0x1d5
> [ 0.816669] [<ffffffff8114e10c>] ? sysfs_create_link+0xe/0x10
> [ 0.816674] [<ffffffff8126cef1>] ? acpi_video_device_find_cap+0x1f5/0x2de
> [ 0.816678] [<ffffffff8126d196>] ? acpi_video_bus_get_one_device+0x1bc/0x250
> [ 0.816682] [<ffffffff8126d3f8>] ? acpi_video_bus_add+0x1ce/0x36e
> [ 0.816687] [<ffffffff8124983d>] ? acpi_device_probe+0x49/0x117
> [ 0.816692] [<ffffffff812bd56b>] ? really_probe+0xc0/0x14d
> [ 0.816696] [<ffffffff812bd6fe>] ? driver_probe_device+0x37/0x52
> [ 0.816700] [<ffffffff812bd773>] ? __driver_attach+0x5a/0x7d
> [ 0.816704] [<ffffffff812bd719>] ? __driver_attach+0x0/0x7d
> [ 0.816708] [<ffffffff812bc85d>] ? bus_for_each_dev+0x54/0x88
> [ 0.816712] [<ffffffff812bd319>] ? driver_attach+0x19/0x1b
> [ 0.816715] [<ffffffff812bcf6d>] ? bus_add_driver+0xab/0x201
> [ 0.816719] [<ffffffff812bd976>] ? driver_register+0xb2/0x11f
> [ 0.816724] [<ffffffff81b3cf29>] ? acpi_video_init+0x0/0x17
> [ 0.816729] [<ffffffff8124a29e>] ? acpi_bus_register_driver+0x3e/0x40
> [ 0.816732] [<ffffffff8126c8c5>] ? acpi_video_register+0x1b/0x34
> [ 0.816736] [<ffffffff81b3cf3e>] ? acpi_video_init+0x15/0x17
> [ 0.816741] [<ffffffff8100020a>] ? do_one_initcall+0x7a/0x130
> [ 0.816746] [<ffffffff81b1bc0e>] ? kernel_init+0xe1/0x15b
> [ 0.816750] [<ffffffff81002f94>] ? kernel_thread_helper+0x4/0x10
> [ 0.816754] [<ffffffff8102a634>] ? finish_task_switch+0x3f/0xe3
> [ 0.816759] [<ffffffff8155ab44>] ? restore_args+0x0/0x30
> [ 0.816763] [<ffffffff81b1bb2d>] ? kernel_init+0x0/0x15b
> [ 0.816766] [<ffffffff81002f90>] ? kernel_thread_helper+0x0/0x10
> [ 0.816804] ---[ end trace 6d450e935ee1897c ]---
> [ 0.816808] ACPI: Create sysfs link
> [ 0.817274] acpi device:38: registered as cooling_device0
> [ 0.818068] input: Video Bus as /devices/LNXSYSTM:00/device:00/PNP0A03:00/device:36/LNXVIDEO:00/input/input3
> [ 0.818077] ACPI: Video Device [VID] (multi-head: yes rom: no post: no)
> [ 0.818236] [Firmware Bug]: Duplicate ACPI video bus devices for the same VGA controller, please try module parameter "video.allow_duplicates=1"if the current driver doesn't work.

Have you tried this option?

There's nothing sysfs can do here, sorry, it really looks like you have
a BIOS/firmware problem.

good luck,

greg k-h
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