[Dell Inspiron 15 N5050] "Power Management Discrepancy" is displayed on wakeup

[Hans Jorgensen]

Ever since I installed the new kernel, I am seeing this error on the text window when I go down for suspend:

[xxxxxx.yyyyyy] [drm6:rp_sanitize_pm] *ERROR* Power management discrepancy: GEN6_RP_INTERRUPT_LIMITS, expected: 1700000, was: 1206000

where "xxxxxx.yyyyyy" is a set of unpredictable (but increasing) 6-digit numbers. Is there a setting I need to change in the system to make this error go away, or is it a bug in the new kernel?

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.2.0-40-generic 3.2.0-40.64
ProcVersionSignature: Ubuntu 3.2.0-40.64-generic 3.2.40
Uname: Linux 3.2.0-40-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu17.1
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: PCH [HDA Intel PCH], device 0: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: hans 1962 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'PCH'/'HDA Intel PCH at 0xf7e00000 irq 45'
   Mixer name : 'Intel CougarPoint HDMI'
   Components : 'HDA:111d76d1,10280504,00100205 HDA:80862805,80860101,00100000'
   Controls : 23
   Simple ctrls : 11
Date: Wed Apr 10 18:50:20 2013
HibernationDevice: RESUME=UUID=f4fe51bd-1f81-4024-af67-b65e22aac6a4
InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
MachineType: Dell Inc. Inspiron N5050
MarkForUpload: True
ProcEnviron:
 LANGUAGE=en_CA:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-40-generic root=UUID=3d0bc00a-4e48-432c-b993-410594239191 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.2.0-40-generic N/A
 linux-backports-modules-3.2.0-40-generic N/A
 linux-firmware 1.79.1
SourcePackage: linux
StagingDrivers: mei
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/03/2012
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A05
dmi.board.name: 01HXXJ
dmi.board.vendor: Dell Inc.
dmi.board.version: A05
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: Not Specified
dmi.modalias: dmi:bvnDellInc.:bvrA05:bd08/03/2012:svnDellInc.:pnInspironN5050:pvrNotSpecified:rvnDellInc.:rn01HXXJ:rvrA05:cvnDellInc.:ct8:cvrNotSpecified:
dmi.product.name: Inspiron N5050
dmi.product.version: Not Specified
dmi.sys.vendor: Dell Inc.

[Brad Figg (brad-figg)]

This change was made by a bot.

[Hans Jorgensen (kans)]

UPDATE: This error message appears once when I suspend, and again when I wake up from suspend. All of the previous error messages are on the screen when I suspend or wake up from suspend.

[Robert Bernath (y-robert)]

After a complete Shot Down then Power On the error message disapperaed.

[Hans Jorgensen (kans)]

@Robert Bernath: I just did that and the error disappeared for me, too. This error is probably because the two versions of the Linux kernel had different power requirements.

[Hans Jorgensen (kans)]

Never mind, it came right back when I put it to sleep again. Not solved yet.

[Robert Bernath (y-robert)]

Hans,
Unfortunately the same with me :(

[Joseph Salisbury (jsalisbury)]

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v3.9 kernel[0]. You will need to install both the linux-image and linux-image-extra .deb packages.

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/v3.9-rc6-raring/

[David O'Meara (david-omeara)]

Still unable to log in after trying with daily/2013-05-12-precise, v3.10-rc1-precise, v3.3.6-precise, v3.4-precise and 3.9-rc8-raring
Same issue in each case (as with 3.2.0-41) attempting to log in to the desktop shows a black screen then returns to the login screen.

[David O'Meara (david-omeara)]

Slight misinformation, sorry. The initial issue with the "Power management discrepancy" message was resolved after bringing in an updated kernel. I was still unable to login (and the behaviour appeared similar) but in this case I was unable to login due to ~/.Xauthority being owned by root. chown david:david and it was fixed.

[Michele Kipiel (michele-kipiel)]

same bug here, unfortunately!

computer: Dell XPS13
OS: ubuntu 12.04.2 + spuntnik kernel ( https://launchpad.net/~canonical-hwe-team/+archive/sputnik-kernel )

***

No problems so far using ubuntu 13.04 + default kernel

[Ashwin Narayan (ashwinnarayan)]

Same bug for me too. Everything's fine if I shut down my laptop and start it up again but if I wake up from sleep mode it shows this every time I wake. I don't notice anything else wrong with the computer except for this error message. It tends to build up as I put my computer in sleep mode a lot.

computer: Dell XPS L502x
OS: Ubuntu 12.04 3.2.0-48-generic #74-Ubuntu SMP Thu Jun 6 19:43:26 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

[Joseph Salisbury (jsalisbury)]

Can folks affected by this also test the latest 3.2 stable kernel, which can be downloaded from:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.2.47-precise/

[penalvch (penalvch)]

Hans Jorgensen, could you please provide an impact statement regarding how suspend is or isn't working, and if the message noted is just innocuous?

[Hans (hans-3)]

@penalvch: Yes, I'd be happy to provide an impact statement.

I don't perceive any problems with suspend or resume - it is working just fine, as it does on my Windows laptops (dual boot on the same system as well as an HP EliteBook work system). The message is innocuous. It is, however, still happening into v3.2.49, and sometimes the power discrepancy values are different (I can't remember them off the top of my head). The error doesn't always appear, either.

[Bernhard Wiedemann (bwiedemann-7)]

I think this issue affects me too.

I have a Gigabyte Z68MS-UD2H-B3 Motherboard with Precise and I got this error when coming back from suspend.

The latest kernel version not affected is 3.2.0.39

All other version show this issue.
I also tried with linux-image-3.2.49-030249-generic-pae. This did not show the message, but I am not so sure, because there where a lot of other message, maybe masking this "Power management discrepancy: GEN6_RP_INTERRUPT_LIMITS,.."

I hope this helps finding the problem.

[penalvch (penalvch)]

Bernhard Wiedemann, if you have a bug in Ubuntu, the Ubuntu Kernel team, Ubuntu Bug Control team, and Ubuntu Bug Squad would like you to please file a new report by executing the following in a terminal:
ubuntu-bug linux

For more on this, please see the Ubuntu Kernel team article:
https://wiki.ubuntu.com/KernelTeam/KernelTeamBugPolicies#Filing_Kernel_Bug_reports

the Ubuntu Bug Control team and Ubuntu Bug Squad team article:
https://wiki.ubuntu.com/Bugs/BestPractices#X.2BAC8-Reporting.Focus_on_One_Issue

and Ubuntu Community article:
https://help.ubuntu.com/community/ReportingBugs#Bug_reporting_etiquette

When opening up the new report, please feel free to subscribe me to it.

Please note, not filing a new report would delay your problem being addressed as quickly as possible.

Thank you for your understanding.

[Bernhard Wiedemann (bwiedemann-7)]

Christopher,

I reported a bug as you suggested:
Bug #1208132

best regards, Bernhard

[Bernhard Wiedemann (bwiedemann-7)]

Waht helped for me was upgrading to 12.04.2 with kernel 3.5 as described here

http://askubuntu.com/questions/279391/quantal-backported-kernel-in-12-04-2-whats-going-on-there