disk usage for 10 seconds when plugging the AC [2.6.35-2-generic]

[Nicolò Chieffo]

The steps to reproduce are very simple:
1) unplug the AC
2) plug the AC

what happens: the hard disk led stays lighted for 10~20 seconds, while the laptop in unresponsive.
I've hisolated the dmesg, which I'll paste here

[ 251.041719] ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
[ 251.041724] sr 1:0:0:0: CDB: Test Unit Ready: 00 00 00 00 00 00
[ 251.041733] ata2.00: cmd a0/00:00:00:00:00/00:00:00:00:00/a0 tag 0
[ 251.041734] res 40/00:03:00:00:00/00:00:00:00:00/a0 Emask 0x4 (timeout)
[ 251.041737] ata2.00: status: { DRDY }
[ 251.041740] ata2: hard resetting link
[ 251.572575] ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[ 251.600225] ata2.00: configured for UDMA/100
[ 251.600836] ata2: EH complete
[ 252.082555] ata1.00: exception Emask 0x0 SAct 0xf SErr 0x0 action 0x6 frozen
[ 252.082567] ata1.00: failed command: WRITE FPDMA QUEUED
[ 252.082572] ata1.00: cmd 61/08:00:d5:a4:0c/00:00:12:00:00/40 tag 0 ncq 4096 out
[ 252.082573] res 40/00:fe:00:00:00/00:00:00:00:00/40 Emask 0x4 (timeout)
[ 252.082576] ata1.00: status: { DRDY }
[ 252.082578] ata1.00: failed command: WRITE FPDMA QUEUED
[ 252.082583] ata1.00: cmd 61/08:08:5d:29:91/00:00:11:00:00/40 tag 1 ncq 4096 out
[ 252.082584] res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
[ 252.082586] ata1.00: status: { DRDY }
[ 252.082588] ata1.00: failed command: WRITE FPDMA QUEUED
[ 252.082592] ata1.00: cmd 61/08:10:ed:22:a7/00:00:11:00:00/40 tag 2 ncq 4096 out
[ 252.082593] res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
[ 252.082596] ata1.00: status: { DRDY }
[ 252.082598] ata1.00: failed command: WRITE FPDMA QUEUED
[ 252.082602] ata1.00: cmd 61/08:18:15:23:a7/00:00:11:00:00/40 tag 3 ncq 4096 out
[ 252.082603] res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
[ 252.082605] ata1.00: status: { DRDY }
[ 252.082609] ata1: hard resetting link
[ 252.610221] ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[ 252.715036] ata1.00: configured for UDMA/133
[ 252.715045] ata1.00: device reported invalid CHS sector 0
[ 252.715050] ata1.00: device reported invalid CHS sector 0
[ 252.715053] ata1.00: device reported invalid CHS sector 0
[ 252.715056] ata1.00: device reported invalid CHS sector 0
[ 252.715071] ata1: EH complete

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: linux-image-2.6.35-2-generic 2.6.35-2.3
Regression: Yes
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.35-2.3-generic 2.6.35-rc2
Uname: Linux 2.6.35-2-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 2/2
   Subdevice #0: subdevice #0
   Subdevice #1: subdevice #1
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: yelo3 1514 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xf6adc000 irq 47'
   Mixer name : 'Intel Cantiga HDMI'
   Components : 'HDA:111d76b2,10280233,00100302 HDA:80862802,80860101,00100000'
   Controls : 24
   Simple ctrls : 15
CurrentDmesg:

Date: Sun Jun 13 11:57:55 2010
HibernationDevice: RESUME=/dev/sda6
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
MachineType: Dell Inc. Latitude E6400
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-2-generic root=UUID=c65f05e4-8a87-4923-89ff-929c3811ba3c ro quiet splash
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, user)
 LANG=it_IT.utf8
 SHELL=/bin/bash
RelatedPackageVersions: linux-firmware 1.36
SourcePackage: linux
dmi.bios.date: 12/21/2009
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A20
dmi.board.name: 0RX493
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA20:bd12/21/2009:svnDellInc.:pnLatitudeE6400:pvr:rvnDellInc.:rn0RX493:rvr:cvnDellInc.:ct8:cvr:
dmi.product.name: Latitude E6400
dmi.sys.vendor: Dell Inc.

[Jeremy Foshee (jeremyfoshee)]

Hi Nicolò,

If you could also please test the latest upstream kernel available that would be great. It will allow additional upstream developers to examine the issue. Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Once you've tested the upstream kernel, please remove the 'needs-upstream-testing' tag. This can be done by clicking on the yellow pencil icon next to the tag located at the bottom of the bug description and deleting the 'needs-upstream-testing' text. Please let us know your results.

Thanks in advance.

    [This is an automated message. Apologies if it has reached you inappropriately; please just reply to this message indicating so.]

[Nicolò Chieffo (yelo3)]

I downloaded v2.6.35-rc3-maverick and I'm testing it now.
It does not seem to have the same hard disk led issue, but I can see
this error in dmesg:

[ 65.814914] ata2: exception Emask 0x10 SAct 0x0 SErr 0x50000 action
0xe frozen
[ 65.814920] ata2: irq_stat 0x00400000, PHY RDY changed
[ 65.814924] ata2: SError: { PHYRdyChg CommWake }
[ 65.814931] ata2: hard resetting link
[ 66.740211] ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[ 66.767948] ata2.00: configured for UDMA/100
[ 66.768539] ata2: EH complete

[Nicolò Chieffo (yelo3)]

This is fixed now.

[Ipeacocks (ipeacocks)]

this bug also present in 10.10 with 2.6.35-22-generic on Dell Vostro 1000 when plug and unplug AC

[Ipeacocks (ipeacocks)]

and also with this kernel http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.35.8-maverick/