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[Bug 962402] [NEW] [Dell Studio XPS 1640] keyboard stops responding after backlight toggle


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I am usind Ubuntu 11.10 x64 on Dell Studio XPS 16 laptop whitch has a
keyboard backlight. Everything works fine, except if i try to toggle
backlight (to change brightness or to turn it off while on battery), all
keyboard seems to stop working, but shortcuts still work - i can kill X,
change music, etc.

Edit: it seems same situation is using ubuntu 12.04..
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0-0ubuntu2
Architecture: amd64
DistroRelease: Ubuntu 12.04
HibernationDevice: RESUME=UUID=f963a452-1f94-4294-aaaf-b9532de52b62
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120328)
MachineType: Dell Inc. Studio XPS 1640
NonfreeKernelModules: fglrx
Package: linux (not installed)
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-21-generic root=UUID=fd037b24-4917-4420-9a04-5d049fab4493 ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 3.2.0-21.34-generic 3.2.13
SourcePackage: linux
Tags:  precise precise
Uname: Linux 3.2.0-21-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
dmi.bios.date: 05/07/2009
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A07
dmi.board.name: 0W497D
dmi.board.vendor: Dell Inc.
dmi.board.version: A07
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A07
dmi.modalias: dmi:bvnDellInc.:bvrA07:bd05/07/2009:svnDellInc.:pnStudioXPS1640:pvrA073:rvnDellInc.:rn0W497D:rvrA07:cvnDellInc.:ct8:cvrA07:
dmi.product.name: Studio XPS 1640
dmi.product.version: A073
dmi.sys.vendor: Dell Inc.

** Affects: linux (Ubuntu)
     Importance: Low
         Status: Incomplete

** Tags: apport-collected bios-outdated-a15 bot-comment oneiric precise
[Dell Studio XPS 1640] keyboard stops responding after backlight toggle
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