Public bug reported:
Using the 32 bit kernel I am unable to write to the ACPI memory area
using the command
sudo dd if=value_file of=/dev/mem bs=1 seek=3660685688 count=4
This gives the error
dd: writing `/dev/mem': Bad address
3660685688 is 0xDA31A178 and sudo cat /proc/iomem shows
...
da216000-da32bfff : ACPI Non-volatile Storage
...
This works ok with the 64 bit kernel.
I have also tested it with the Oneiric kernel 3.0.0-12 and again the 64 bit
kernel is ok but the 32 bit gives the error.
In case it is relevant the context is that I am trying to apply the workaround
for bug #806032 (
Fn + F[89] does not work for controlling brightness on Clevo laptops) described
in comment #7, which works perfectly on the 64 bit kernel but gives Bad Address
error on 32 bit.
ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: linux-image-3.5.0-10-generic 3.5.0-10.10
ProcVersionSignature: Ubuntu 3.5.0-10.10-generic 3.5.1
Uname: Linux 3.5.0-10-generic i686
ApportVersion: 2.4-0ubuntu6
Architecture: i386
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: colinl 2142 F.... pulseaudio
Date: Wed Aug 15 13:42:37 2012
HibernationDevice: RESUME=UUID=386e4578-bf9d-4970-a10f-b0b513b32771
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha i386 (20120730.1)
MachineType: CLEVO CO. W240EU/W250EUQ/W270EUQ
ProcEnviron:
LANGUAGE=en_GB:en
TERM=xterm
PATH=(custom, user)
LANG=en_GB.UTF-8
SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-10-generic
root=UUID=c5043680-f556-4f19-9e32-c6fdb4c05f9e ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.5.0-10-generic N/A
linux-backports-modules-3.5.0-10-generic N/A
linux-firmware 1.88
RfKill:
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: yes
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/24/2012
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 4.6.5
dmi.board.asset.tag: Tag 12345
dmi.board.name: W240EU/W250EUQ/W270EUQ
dmi.board.vendor: CLEVO CO.
dmi.board.version: V3.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: No Enclosure
dmi.chassis.version: N/A
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr4.6.5:bd02/24/2012:svnCLEVOCO.:pnW240EU/W250EUQ/W270EUQ:pvrNotApplicable:rvnCLEVOCO.:rnW240EU/W250EUQ/W270EUQ:rvrV3.0:cvnNoEnclosure:ct10:cvrN/A:
dmi.product.name: W240EU/W250EUQ/W270EUQ
dmi.product.version: Not Applicable
dmi.sys.vendor: CLEVO CO.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed
** Tags: apport-bug i386 quantal running-unity
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https://bugs.launchpad.net/bugs/1037094
Title:
"writing `/dev/mem': Bad address" Error writing to ACPI area with 32
bit kernel
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