[Bug 652460] [NEW] Kernel oops when using workaround to enable ThinkPad volume keys for software volume

[Jesse B. Hannah]

Public bug reported:

When running the command

$ echo enable,0x00ffffff | sudo tee /proc/acpi/ibm/hotkey

in the terminal, or having the line

$ echo enable,0x00ffffff > /proc/acpi/ibm/hotkey

in /etc/rc.local and logging in, Ubuntu 10.10 RC with 2.6.35-22 reports
a serious kernel error. Those commands are, admittedly, a workaround to
allow the hardware volume keys on a ThinkPad laptop (X60 Tablet, in my
case) to change the software volume, but this issue did not occur with
kernel 2.6.32-25 on Ubuntu 10.04.

ProblemType: KernelOops
DistroRelease: Ubuntu 10.10
Package: linux-image-2.6.35-22-generic 2.6.35-22.33
Regression: Yes
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.35-22.33-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Annotation: Your system might become unstable now and might need to be restarted.
Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: AD198x Analog [AD198x Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  jbhannah   1641 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xee240000 irq 47'
   Mixer name	: 'Analog Devices AD1981'
   Components	: 'HDA:11d41981,17aa2025,00100200'
   Controls      : 20
   Simple ctrls  : 11
Card29.Amixer.info:
 Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw 7JHT13WW-1.04'
   Mixer name	: 'ThinkPad EC 7JHT13WW-1.04'
   Components	: ''
   Controls      : 2
   Simple ctrls  : 1
Card29.Amixer.values:
 Simple mixer control 'Console',0
   Capabilities: pvolume pvolume-joined pswitch pswitch-joined penum
   Playback channels: Mono
   Limits: Playback 0 - 14
   Mono: Playback 7 [50%] [on]
Date: Thu Sep 30 11:45:23 2010
Failure: oops
HibernationDevice: RESUME=UUID=ed8e9e4e-4bbe-48ed-a764-59f403859376
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
MachineType: LENOVO 6366L6U
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-22-generic root=UUID=0cf0ada7-8769-46b8-ad45-cc6acc26af8c ro quiet splash
RelatedPackageVersions: linux-firmware 1.38
RfKill:
 0: phy0: Wireless LAN
 	Soft blocked: no
 	Hard blocked: no
SourcePackage: linux
Title: WARNING: at /build/buildd/linux-2.6.35/drivers/platform/x86/thinkpad_acpi.c:3796 hotkey_enabledisable_warn+0x54/0x60 [thinkpad_acpi]()
dmi.bios.date: 11/20/2008
dmi.bios.vendor: LENOVO
dmi.bios.version: 7JET30WW (1.15 )
dmi.board.name: 6366L6U
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr7JET30WW(1.15):bd11/20/2008:svnLENOVO:pn6366L6U:pvrThinkPadX60Tablet:rvnLENOVO:rn6366L6U:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 6366L6U
dmi.product.version: ThinkPad X60 Tablet
dmi.sys.vendor: LENOVO

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-kerneloops i386 kernel-oops kernel-uncat maverick maverick-rc needs-upstream-testing regression-potential thinkpad volume

-- 
Kernel oops when using workaround to enable ThinkPad volume keys for software volume
https://bugs.launchpad.net/bugs/652460
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