Oneiric kernel 3.0.0-9.12 yields the following warning and stack trace since the application of the backported intel backlight patch (commit d1969fb "Not all systems expose a firmware or platform mechanism for changing the backlight intensity on i915, so add native driver support"):
[ 4.426067] ------------[ cut here ]------------
[ 4.426078] WARNING: at /build/buildd/linux-3.0.0/fs/sysfs/dir.c:455 sysfs_ad
d_one+0xc0/0xf0()
[ 4.426080] Hardware name: Studio 1558
[ 4.426082] sysfs: cannot create duplicate filename '/devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight'
---
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
Architecture: amd64
ArecordDevices:
**** List of CAPTURE Hardware Devices ****
card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: kamal 1543 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
Card hw:0 'Intel'/'HDA Intel at 0xf0a00000 irq 45'
Mixer name : 'Intel IbexPeak HDMI'
Components : 'HDA:111d7675,10280413,00100103 HDA:80862804,80860101,00100000'
Controls : 20
Simple ctrls : 11
DistroRelease: Ubuntu 11.10
HibernationDevice: RESUME=UUID=76b4b4d6-3b21-4901-8a43-a9142b37f846
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110803.1)
MachineType: Dell Inc. Studio 1558
Package: linux (not installed)
ProcEnviron:
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-8-generic root=UUID=5df9208a-190d-46f4-8b37-fdedf5d0eda0 ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 3.0.0-8.11+username~mjgbacklight5-generic 3.0.1
RelatedPackageVersions:
linux-restricted-modules-3.0.0-8-generic N/A
linux-backports-modules-3.0.0-8-generic N/A
linux-firmware 1.59
StagingDrivers: mei
Tags: oneiric running-unity staging
Uname: Linux 3.0.0-8-generic x86_64
UpgradeStatus: Upgraded to oneiric on 2011-08-15 (6 days ago)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
dmi.bios.date: 03/11/2010
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A04
dmi.board.name: 0G939P
dmi.board.vendor: Dell Inc.
dmi.board.version: A04
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A04
dmi.modalias: dmi:bvnDellInc.:bvrA04:bd03/11/2010:svnDellInc.:pnStudio1558:pvrA04:rvnDellInc.:rn0G939P:rvrA04:cvnDellInc.:ct8:cvrA04:
dmi.product.name: Studio 1558
dmi.product.version: A04
dmi.sys.vendor: Dell Inc.
This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:
apport-collect 831542
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the Ubuntu Kernel Team.