Did this issue occur in a previous version of Ubuntu, or is this a new
issue?
Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v3.12 kernel[0].
If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.
If the mainline kernel does not fix this bug, please add the tag:
'kernel-bug-exists-upstream'.
If you are unable to test the mainline kernel, for example it will not boot,
please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as
Confirmed.
Thanks in advance.
[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.13-rc3-trusty/
** Changed in: linux (Ubuntu)
Importance: Undecided = Medium
** Changed in: linux (Ubuntu)
Status: Confirmed = Incomplete
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https://bugs.launchpad.net/bugs/1258686
Title:
Faulty laptop battery or AC throws system cache for a loop
Status in “linux” package in Ubuntu:
Incomplete
Bug description:
After a random period of time after a fresh boot, the system cache
gets corrupted. This is shown by hdparm -T.
Before system cache corruption:
Timing cached reads: 1804 MB in 2.00 seconds = 902.88 MB/sec
After system cache corruption:
Timing cached reads: 258 MB in 2.00 seconds = 129.10 MB/sec
Either the system battery or the AC adaptor is not functioning
correctly, the Dell bios at times indicates that the AC adaptor is not
a valid Dell product, though it is. In any case, the battery does not
charge, but remains at 0%.
ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: linux-image-3.11.0-12-generic 3.11.0-12.19
ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
Uname: Linux 3.11.0-12-generic i686
ApportVersion: 2.12.5-0ubuntu2.1
Architecture: i386
AudioDevicesInUse:
USERPID ACCESS COMMAND
/dev/snd/controlC0: asp1931 F pulseaudio
Date: Fri Dec 6 18:45:58 2013
HibernationDevice: RESUME=UUID=08003f81-dc4b-4697-adb9-c4f28291be17
InstallationDate: Installed on 2013-12-06 (0 days ago)
InstallationMedia: Ubuntu 13.10 Saucy Salamander - Release i386 (20131016.1)
MachineType: Dell Inc. Latitude D420
MarkForUpload: True
PccardctlIdent:
Socket 0:
no product info available
PccardctlStatus:
Socket 0:
no card
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-12-generic
root=UUID=ecd26c7d-0cb5-446e-a2ca-e4fefc0c0fd0 ro quiet splash
processor.ignore_ppc=1 vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.11.0-12-generic N/A
linux-backports-modules-3.11.0-12-generic N/A
linux-firmware 1.116
RfKill:
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/02/2008
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A06
dmi.board.name: 0TJ984
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvrA06:bd02/02/2008:svnDellInc.:pnLatitudeD420:pvr:rvnDellInc.:rn0TJ984:rvr:cvnDellInc.:ct8:cvr:
dmi.product.name: Latitude D420
dmi.sys.vendor: Dell Inc.
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